Publications PD Dr. Roger A. De Souza

Showing 1 - 107 of 107 Results

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  • Kaub, Johannes; Kler, Joe; Parker, Stephen C.; De Souza, Roger A.
    The usefulness of molecular-dynamics simulations in clarifying the activation enthalpy of oxygen-vacancy migration in the perovskite oxide BaTiO 3
    Physical chemistry, chemical physics, 22, 5413-5417 (2020)
    [DOI: 10.1039/C9CP06838D]
  • Tong, Xiaorui; Mebane, David S.; De Souza, Roger A.
    Analyzing the grain‐boundary resistance of oxide‐ion conducting electrolytes: Poisson‐Cahn vs Poisson‐Boltzmann theories
    Journal of the American Ceramic Society, 103, 5-22 (2019)
    [DOI: 10.1111/jace.16716]
  • De Souza, Roger A.; Barboni, Denis
    Iodide-ion conduction in methylammonium lead iodide perovskite: some extraordinary aspects
    Chemical communications, 55, 1108-1111 (2019)
    [DOI: 10.1039/C8CC09236B]
  • Zhu, Jiaxin; Lee, Jung-Woo; Lee, Hyungwoo; Xie, Lin; Pan, Xiaoqing; De Souza, Roger A.; Eom, Chang-Beom; Nonnenmann, Stephen S.
    Probing vacancy behavior across complex oxide heterointerfaces
    Science advances, 5, eaau8467 (2019)
    [DOI: 10.1126/sciadv.aau8467]
  • De Souza, R. A.; Dickey, E. C.
    The effect of space-charge formation on the grain-boundary energy of an ionic solid
    Philosophical transactions of the Royal Society of London / A, 377, 20180430 (2019)
    [DOI: 10.1098/rsta.2018.0430]
  • Zhang, Haiwu; De Souza, Roger A.
    Optimising oxygen diffusion in non-cubic, non-dilute perovskite oxides based on BiFeO 3
    Journal of materials chemistry / A Materials for energy and sustainability A, 7, 25274-25278 (2019)
    [DOI: 10.1039/C9TA08980B]
  • Parras, Jana P.; Cao, Chen; Ma, Zheng; Mücke, Robert; Jin, Lei; Dunin‐Borkowski, Rafal; Guillon, Olivier; De Souza, Roger A.
    The grain‐boundary resistance of CeO 2 ceramics: A combined microscopy‐spectroscopy‐simulation study of a dilute solution
    Journal of the American Ceramic Society, 97, jace.16843 (2019)
    [DOI: 10.1111/jace.16843]
  • Kwon, Deok‐Hwang; Lee, Shinbuhm; Kang, Chan Soon; Choi, Yong Seok; Kang, Sung Jin; Cho, Hae Lim; Sohn, Woonbae; Jo, Janghyun; Lee, Seung‐Yong; Oh, Kyu Hwan; Noh, Tae Won; De Souza, Roger A.; Martin, Manfred; Kim, Miyoung
    Unraveling the Origin and Mechanism of Nanofilament Formation in Polycrystalline SrTiO3 Resistive Switching Memories
    Advanced materials, 31, 1901322 (2019)
    [DOI: 10.1002/adma.201901322]
  • Rheinheimer, Wolfgang; Parras, Jana P.; Preusker, Jan‐Helmut; De Souza, Roger A.; Hoffmann, Michael M.
    Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility
    Journal of the American Ceramic Society, 102, 3779-3790 (2019)
    [DOI: 10.1111/jace.16217]
  • Hellwig, Maren; Köppen, Martin; Hiller, Albert; Koslowski, Hans; Litnovsky, Andrey; Schmid, Klaus; Schwab, Christian; De Souza, Roger A.
    Impact of Surface Roughness on Ion-Surface Interactions Studied with Energetic Carbon Ions 13C+ on Tungsten Surfaces
    Condensed Matter, 4, 29 (2019)
    [DOI: 10.3390/condmat4010029]
  • Waldow, Stephan P.; Wardenga, Hans; Beschnitt, Stefan; Klein, Andreas; De Souza, Roger A.
    Concentration and Diffusivity of Oxygen Interstitials in Niobia-Doped Ceria
    The journal of physical chemistry / C, 123, 6340-6350 (2019)
    [DOI: 10.1021/acs.jpcc.8b10613]
  • Kessel, Markus; De Souza, Roger A.; Martin, Manfred
    Correction: Oxygen diffusion in single crystal barium titanate
    Physical chemistry, chemical physics, 20, 29568-29568 (2018)
    [DOI: 10.1039/C8CP91913E]
  • Heisig, Thomas; Bäumer, Christoph; Gries, Ute; Müller, Michael Patrick; La Torre, Camilla; Lübben, Michael; Raab, Nicolas; Du, Hongchu; Menzel, Stephan; Mueller, David N.; Jia, Chun-Lin; Mayer, Joachim; Waser, Rainer; Valov, Ilia; De Souza, Roger A.; Dittmann, Regina
    Oxygen Exchange Processes between Oxide Memristive Devices and Water Molecules
    Advanced materials, 30, 1800957 (2018)
    [DOI: 10.1002/adma.201800957]
  • Barboni, Denis; De Souza, Roger A.
    The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide
    Energy & environmental science, 11, 3266-3274 (2018)
    [DOI: 10.1039/C8EE01697F]
  • Zhang, Haiwu; Ramadan, Amr Hazem Helmy; De Souza, Roger A.
    Atomistic simulations of ion migration in sodium bismuth titanate (NBT) materials: towards superior oxide-ion conductors
    Journal of materials chemistry / A, 6, 9116-9123 (2018)
    [DOI: 10.1039/C8TA02545B]
  • Kumar, Nitish; Patterson, Eric A.; Frömling, Till; Gorzkowski, Edward P.; Eschbach, Peter; Love, Ian; Müller, Michael Patrick; De Souza, Roger A.; Tucker, Julie; Reese, Steven R.; Cann, David P.
    Defect mechanisms in BaTiO3‐BiMO3 ceramics
    Journal of the American Ceramic Society, 101, 2376-2390 (2017)
    [DOI: 10.1111/jace.15403]
  • Müller, Michael Patrick; De Souza, Roger A.
    SIMS study of oxygen diffusion in monoclinic HfO2 editors-pick
    Applied physics letters, 112, 051908 (2018)
    [DOI: 10.1063/1.5020370]
  • Gries, Ute; Schraknepper, Henning; Skaja, K.; Gunkel, Felix; Hoffmann-Eifert, S.; Waser, Rainer; De Souza, Roger A.
    A SIMS study of cation and anion diffusion in tantalum oxide
    Physical chemistry, chemical physics : PCCP, 2018, 989-996 (2018)
    [DOI: 10.1039/C7CP07441G]
  • Witte, Wolfram; De Souza, Roger A.; Martin, Manfred; Eicke, Axel; Hariskos, Dimitrios
    Deuterium Markers in CdS and Zn(O,S) Buffer Layers Deposited by Solution Growth for Cu(In,Ga)Se 2 Thin-Film Solar Cells
    Physica status solidi / Rapid research letters, 11, 1700288 (2017)
    [DOI: 10.1002/pssr.201700288]
  • Zurhelle, Alexander; Tong, Xiaorui; Klein, Andreas; Mebane, David S.; De Souza, Roger A.
    A Space-Charge Treatment of the Increased Concentration of Reactive Species at the Surface of a Ceria Solid Solution
    Angewandte Chemie / International edition, 56, 14516-14520 (2017)
    [DOI: 10.1002/anie.201708118]
  • Kura, Chiharu; Kunisada, Yuji; Tsuji, Etsushi; Zhu, Chunyu; Habazaki, Hiroki; Nagata, Shinji; Müller, Michael Patrick; De Souza, Roger A.; Aoki, Yoshitaka
    Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity
    Nature energy, 2, 786-794 (2017)
    [DOI: 10.1038/s41560-017-0002-2]
  • De Souza, Roger A.
    Limits to the rate of oxygen transport in mixed-conducting oxides
    Journal of materials chemistry / A, 5, 20334-20350 (2017)
    [DOI: 10.1039/C7TA04266C]
  • Beschnitt, Stefan; De Souza, Roger A.
    Impurity diffusion of Hf and Zr in Gd-doped CeO 2
    Solid state ionics, 305, 23-29 (2017)
    [DOI: 10.1016/j.ssi.2017.03.029]
  • Schie, Marcel; Müller, Michael Patrick; Salinga, Martin; Waser, Rainer; De Souza, Roger A.
    Ion migration in crystalline and amorphous HfO X
    The journal of chemical physics, 146, 094508 (2017)
    [DOI: 10.1063/1.4977453]
  • De Souza, Roger A.; Amezawa, Koji; Burriel, Mónica; Chueh, William; Kelder, Erik M.
    Special Issue for the E-MRS Spring Meeting Symposium D on Solid State Ionics
    Solid state ionics, 299, 1-1 (2017)
    [DOI: 10.1016/j.ssi.2016.12.018]
  • Schraknepper, Henning; Bäumer, Christoph; Gunkel, Felix; Dittmann, Regina; De Souza, Roger A.
    Pulsed laser deposition of SrRuO 3 thin-films: The role of the pulse repetition rate
    APL materials, 4, 126109 (2016)
    [DOI: 10.1063/1.4972996]
  • Genreith-Schriever, Annalena R.; De Souza, Roger A.
    Field-enhanced ion transport in solids: Reexamination with molecular dynamics simulations
    Physical review / B, 94, 224304 (2016)
    [DOI: 10.1103/PhysRevB.94.224304]
  • Ramadan, Amr Hazem Helmy; De Souza, Roger A.
    Atomistic simulations of symmetrical low-angle [100] (01/) tilt boundaries in SrTiO3
    Acta materialia, 118, 286-295 (2016)
    [DOI: 10.1016/j.actamat.2016.07.035]
  • Teusner, Markus; De Souza, Roger A.; Krause, H.; Ebbinghaus, S. G.; Martin, M.
    Oxygen transport in undoped and doped mayenite
    Solid state ionics, 284, 25-27 (2016)
    [DOI: 10.1016/j.ssi.2015.11.024]
  • Gunkel, Felix; Waser, Rainer; Ramadan, Amr Hazem Helmy; De Souza, Roger A.; Hoffmann-Eifert, Susanne; Dittmann, Regina
    Space charges and defect concentration profiles at complex oxide interfaces
    Physical review / B, 93, 245431 (2016)
    [DOI: 10.1103/PhysRevB.93.245431]
  • Rupp, Jennifer L. M.; De Souza, Roger A.; Preis, Wolfgang; Kelder, Eric M.
    The E-MRS Conference, Symposium C "Solid State Ionics: Thin Films for Energy and Information Applications" : [... Lille, France, May 26th to 30th, 2014]
    Solid state ionics, 273, 70 S. (2015)
  • Genreith-Schriever, Annalena R.; Hebbeker, Pascal; Hinterberg, Judith Maria; Zacherle, Tobias; De Souza, Roger A.
    Understanding Oxygen-Vacancy Migration in the Fluorite Oxide CeO2: An Ab Initio Study of Impurity-Anion Migration
    The journal of physical chemistry, 119, 28269-28275 (2015)
    [DOI: 10.1021/acs.jpcc.5b07813]
  • Mebane, David S.; De Souza, Roger A.
    A generalised space-charge theory for extended defects in oxygen-ion conducting electrolytes: from dilute to concentrated solid solutions
    Energy & environmental science, 8, 2935-2940 (2015)
    [DOI: 10.1039/C5EE02060C]
  • De Souza, Roger A.
    Oxygen Diffusion in SrTiO 3 and Related Perovskite Oxides
    Advanced functional materials, 25, 6326-6342 (2015)
    [DOI: 10.1002/adfm.201500827]
  • Beschnitt, Stefan; Zacherle, Tobias; De Souza, Roger A.
    Computational Study of Cation Diffusion in Ceria
    The journal of physical chemistry / C, 119, 27307-27315 (2015)
    [DOI: 10.1021/acs.jpcc.5b09499]
  • Ramadan, Amr Hazem Helmy; Hesselmann, Linda; De Souza, Roger A.
    The phase stability of Ca2TiO4 and related Ruddlesden–Popper phases
    Journal of physics and chemistry of solids, 86, 90-94 (2015)
    [DOI: 10.1016/j.jpcs.2015.06.022]
  • Kessel, Markus; De Souza, Roger A.; Martin, Manfred
    Oxygen diffusion in single crystal barium titanate
    Physical chemistry, chemical physics, 17, 12587-12597 (2015)
    [DOI: 10.1039/C5CP01187F]
  • Teusner, Markus; De Souza, Roger A.; Krause, Holger; Ebbinghaus, Stefan G.; Belghoul, Badreddine; Martin, Manfred
    Oxygen Diffusion in Mayenite
    The journal of physical chemistry , 119, 9721-9727 (2015)
    [DOI: 10.1021/jp512863u]
  • Falkenstein, Andreas; Mueller, David N.; De Souza, Roger A.; Martin, Manfred
    Chemical relaxation experiments on mixed conducting oxides with large stoichiometry deviations
    Solid state ionics, 280, 66-73 (2015)
    [DOI: 10.1016/j.ssi.2015.07.023]
  • Rupp, Jennifer L. M.; De Souza, Roger A.; Lubomirsky, Igor; Preis, Wolfgang; Kelder, Erik M.
    EMRS 2014 Solid State Ionics issue
    Solid state ionics, 273, 1-1 (2015)
    [DOI: 10.1016/j.ssi.2015.03.031]
  • Schraknepper, Henning; Bäumer, Christoph; Dittmann, Regina; De Souza, Roger A.
    Complex behaviour of vacancy point-defects in SrRuO3 thin films
    Physical chemistry, chemical physics, 17, 1060-1069 (2014)
    [DOI: 10.1039/C4CP03632H]
  • Du, Hongchu; Jia, Chun-Lin; Houben, Lothar; Metlenko, Veronika; De Souza, Roger A.; Waser, Rainer; Mayer, Joachim
    Atomic structure and chemistry of dislocation cores at low-angle tilt grain boundary in SrTiO3 bicrystals
    Acta materialia, 89, 344-351 (2015)
    [DOI: 10.1016/j.actamat.2015.02.016]
  • De Souza, Roger A.
    Introduction to the special issue on defects and transport in complex oxides
    Computational materials science, 103, 205- (2015)
    [DOI: 10.1016/j.commatsci.2015.04.007]
  • Vøllestad, Einar; Teusner, Markus; De Souza, Roger A.; Haugsrud, Reidar
    Diffusion of Nd and Mo in lanthanum tungsten oxide
    Solid state ionics, 274, 128-133 (2015)
    [DOI: 10.1016/j.ssi.2015.03.011]
  • Metlenko, Veronika; Ramadan, Amr Hazem Helmy; Gunkel, Felix; Du, Hongchu; Schraknepper, Henning; Hoffmann-Eifert, Susanne; Dittmann, Regina; Waser, Rainer; De Souza, Roger A.
    Do dislocations act as atomic autobahns for oxygen in the perovskite oxide SrTiO3?
    Nanoscale, 6, 12864-12876 (2014)
    [DOI: 10.1039/c4nr04083j]
  • Schie, Marcel; Waser, Rainer; De Souza, Roger A.
    A Simulation Study of Oxygen-Vacancy Behavior in Strontium Titanate: Beyond Nearest-Neighbor Interactions
    The journal of physical chemistry / C, 118, 15185-15192 (2014)
    [DOI: 10.1021/jp504436t]
  • De Souza, Roger A.; Gunkel, Felix; Hoffmann-Eifert, Susanne; Dittmann, Regina
    Finite-size versus interface-proximity effects in thin-film epitaxial SrTiO3
    Physical review / B, Condensed matter and materials physics, 89, 241401 (2014)
    [DOI: 10.1103/PhysRevB.89.241401]
  • De Souza, Roger A.; Voisin, Christophe; Schraknepper, Henning; Teusner, Markus; Kessel, Markus Franz; Dufour, Pascal; Tenailleau, Christophe; Guillemet-Fritsch, Sophie
    Complex diffusion behavior of oxygen in nanocrystalline BaTiO3 ceramics
    Physical chemistry, chemical physics : PCCP, 16, 2568-2575 (2014)
    [DOI: 10.1039/c3cp53979b]
  • Li, Ming; Pietrowski, Martha Joanna; De Souza, Roger A.; Zhang, Huairuo; Reaney, Ian M.; Cook, Stuart N.; Kilner, John A.; Sinclair, Derek C.
    A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3
    Nature materials, 13, 31-35 (2014)
    [DOI: 10.1038/NMAT3782]
  • Martin, M.; Zacherle, T.; Schriever, A.; De Souza, Roger A.; Grieshammer, S.
    Ab initio Calculation of the Defect Structure of Ceria
    Solid oxide fuel cells 13 (SOFC-XIII) : [papers presented at the Thirteenth International Symposium on Solid Oxide Fuel Cells (SOFC-XIII), held in Okinawa, Japan, October 6 - 11, 2013] / sponsoring division: High Temperature Materials. Ed.: T. Kawada ..., 2405-2410 (2013)
    [DOI: 10.1149/05701.2405ecst]
  • Pietrowski, M. J.; De Souza, Roger A.; Fartmann, M.; ter Veen, R.; Martin, M.
    Oxygen Isotope Transport Properties of Yttria-Stabilized Zirconia (YSZ) in O-2(-) and H2O-Containing Atmospheres
    Fuel Cells, 13, 673-681 (2013)
    [DOI: 10.1002/fuce.201300087]
  • Ramadan, Amr Hazem Helmy; Allan, Neil L.; De Souza, Roger A.
    Simulation Studies of the Phase Stability of the Srn+1TinO3n+1 Ruddlesden-Popper Phases
    Journal of the American Ceramic Society, 96, 2316-2321 (2013)
    [DOI: 10.1111/jace.12300]
  • Hinterberg, Judith Maria; Zacherle, T.; De Souza, Roger A.
    Activation Volume Tensor for Oxygen-Vacancy Migration in Strained CeO2 Electrolytes
    Physical review letters : PRL, 110, 205901 (2013)
    [DOI: 10.1103/PhysRevLett.110.205901]
  • Zacherle, Tobias; Schriever, Annalena; De Souza, Roger A.; Martin, Manfred
    Ab initio analysis of defect structure of ceria
    Physical review / B, Condensed matter and materials physics, 87, 134104 (2013)
    [DOI: 10.1103/PhysRevB.87.134104]
  • De Souza, Roger A.; Ramadan, Amr Hazem Helmy
    Ionic conduction in the SrTiO3 YSZ SrTiO3 heterostructure
    Physical chemistry, chemical physics : PCCP, 15, 4505-4509 (2013)
    [DOI: 10.1039/c3cp44399j]
  • Pietrowski, Martha Joanna; De Souza, Roger A.; Kim, Sangtae; Munir, Zuhair A.; Martin, Manfred
    Dehydration kinetics of nano-YSZ ceramics monitored by in-situ infrared spectroscopy
    Solid state ionics, 225 Special, 241-244 (2012)
    [DOI: 10.1016/j.ssi.2012.02.033]
  • Schie, Marcel; Marchewka, Astrid; De Souza, Roger A.; Waser, Rainer
    Atomistic Simulation Study on Oxygen Deficient Strontium Titanate
    Frontiers in electronic materials : a collection of extended abstracts of the Nature Conference Frontiers in Electronic Materials, June 17th to 20th, Aachen, Germany ; [correlation effects, spintronics, and memristive phenomena - fundamentals and applications] / ed. by Joerg Heber ..., 286-286 (2012)
  • Schie, Marcel; Marchewka, Astrid; Müller, Thomas; De Souza, Roger A.; Waser, Rainer
    Molecular Dynamics Simulations of Oxygen Vacancy Diffusion in SrTiO 3
    Journal of physics / Condensed matter, 24, 485002-485008 (2012)
    [DOI: 10.1088/0953-8984/24/48/485002]
  • De Souza, Roger A.; Metlenko, Veronika; Park, Daesung; Weirich, Thomas E.
    Behavior of oxygen vacancies in single-crystal SrTiO3 : equilibrium distribution and diffusion kinetics
    Physical review / B, Condensed matter and materials physics, 85, 174109 (2012)
    [DOI: 10.1103/PhysRevB.85.174109]
  • De Souza, Roger A.; Ramadan, Amr Hazem Helmy; Hoerner, Stefanie
    Modifying the barriers for oxygen-vacancy migration in fluorite-structured CeO2 electrolytes through strain: a computer simulation study
    Energy & environmental science, 5, 5445-5453 (2012)
    [DOI: 10.1039/c2ee02508f]
  • Hirsemann, Dunja; Shylesh, Sankaranarayanapillai; De Souza, Roger A.; Diar-Bakerly, Bashar; Biersack, Bernhard; Müller, David Nikolaus; Martin, Manfred; Schobert, Rainer; Breu, Josef
    Large-Scale, Low-Cost Fabrication of Janus-Type Emulsifiers by Selective Decoration of Natural Kaolinite Platelets
    Angewandte Chemie / International edition, 51, 1348-1352 (2012)
    [DOI: 10.1002/anie.201106710]
  • Pin, Sonia; Newton, Mark A.; D'Acapito, Francesco; Zema, Michele; Tarantino, Serena C.; Spinolo, Giorgio; De Souza, Roger A.; Martin, Manfred; Ghigna, Paolo
    Mechanisms of Reactions in the Solid State: (110) Al2O3 + (001) ZnO Interfacial Reaction
    The journal of physical chemistry / C, 116, 980-986 (2012)
    [DOI: 10.1021/jp209622u]
  • Mueller, David N.; De Souza, Roger A.; Yoo, Han-Ill; Martin, Manfred
    Phase Stability and Oxygen Nonstoichiometry of Highly Oxygen-Deficient Perovskite-Type Oxides: A Case Study of (Ba,Sr)(Co,Fe)O3−δ
    Chemistry of materials, 24, 269-274 (2012)
    [DOI: 10.1021/cm2033004]
  • Harvey, Steven P.; De Souza, Roger A.; Martin, Manfred
    Diffusion of La and Mn in Ba0.5Sr0.5Co0.8Fe0.2O3−δ polycrystalline ceramics
    Energy & environmental science, 5, 5803-5813 (2012)
    [DOI: 10.1039/c1ee02740a]
  • Mauder, Christof; Reuters, Benjamin; Behmenburg, Hannes; De Souza, Roger A.; Woitok, Joachim F.; Chou, Mitch M. C.; Heuken, Michael; Kalisch, Holger; Jansen, Rolf H.
    Mechanisms of impurity incorporation during MOVPE growth of m-plane GaN layers on LiAlO2
    Physica status solidi / C, Current topics in solid state physics, 8, 2050-2052 (2011)
    [DOI: 10.1002/pssc.201001027]
  • Quach, Dat V.; Kim, Sangtae; De Souza, Roger A.; Martin, Manfred; Munir, Zuhair A.
    Grain Size Effect in the Electrical Properties of Nanostructured Functional Oxides through Pressure Modification of the Spark Plasma Sintering Method
    Key engineering materials, 484, 107-116 (2011)
    [DOI: 10.4028/www.scientific.net/KEM.484.107]
  • De Souza, Roger A.; Munir, Zuhair A.; Kim, Sangtae; Martin, Manfred
    Defect chemistry of grain boundaries in proton-conducting solid oxides
    Solid state ionics, 196, 1-8 (2011)
    [DOI: 10.1016/j.ssi.2011.07.001]
  • Valov, Ilia; Luerssen, Bjoern; Mutoro, Eva; Gregoratti, Luca; De Souza, Roger A.; Bredow, Thomas; Günther, Sebastian; Barinov, Alexei; Dudin, Pavel; Martin, Manfred; Janek, Jürgen
    Electrochemical activation of molecular nitrogen at the Ir/ YSZ interface
    Physical chemistry, chemical physics : PCCP, 13, 3394-3410 (2011)
    [DOI: 10.1039/C0CP01024C]
  • De Souza, Roger A.; Martin, Manfred
    Secondary Ion Mass Spectrometry - SIMS
    The encyclopedia of mass spectrometry / edited by Michael L. Gross .... - Vol. 5: Elemental and isotope ratio mass spectrometry / vol. eds. Diane Beauchemin ..., 381-397 (2010)
  • Avila-Paredes, Hugo J.; Chen, Chien-Ting; Wang, Shizhong; De Souza, Roger A.; Martin, Manfred; Munir, Zuhair A.; Kim, Sangtae
    Grain boundaries in dense nanocrystalline ceria ceramics : exclusive pathway for proton conduction at room temperature
    Journal of materials chemistry, 20, 10110-10112 (2010)
    [DOI: 10.1039/C0JM02967J]
  • Mader, Werner; Prangenberg, Thomas; Eichhorn, Simon; De Souza, Roger A.; Martin, Manfred
    Iron Diffusion and Compound Formation in Zinc Oxide
    Diffusion fundamentals, 12, 2 Seiten (2010)
  • Avila-Paredes, Hugo J.; Barrera-Calva, Enrique; Anderson, Harlan U.; De Souza, Roger A.; Martin, Manfred; Munir, Zuhair A.; Kim, Sangtae
    Room-temperature protonic conduction in nanocrystalline films of yttria-stabilized zirconia
    Journal of materials chemistry, 20, 6235-6238 (2010)
    [DOI: 10.1039/C0JM00051E]
  • Mueller, David N.; De Souza, Roger A.; Weirich, Thomas E.; Röhrens, Daniel; Mayer, Joachim; Mayer, Joachim; Martin, Manfred
    A kinetic study of the decomposition of the cubic perovskite-type oxide BaxSr1−xCo0.8Fe0.2O3−δ (BSCF) (x = 0.1 and 0.5)
    Physical chemistry, chemical physics : PCCP, 12, 10320-10328 (2010)
    [DOI: 10.1039/C0CP00441C]
  • Kessel, Markus Franz; De Souza, Roger A.; Yoo, Han-Ill; Martin, Manfred
    Strongly enhanced incorporation of oxygen into barium titanate based multilayer ceramic capacitors using water vapor
    Applied physics letters, 97, 021910 (2010)
    [DOI: 10.1063/1.3460156]
  • Avila-Paredes, Hugo J.; Zhao, Jinfeng; Wang, Shizhong; Pietrowski, Martha Joanna; De Souza, Roger A.; Reinholdt, Alexander; Munir, Zuhair A.; Martin, Manfred; Kim, Sangtae
    Protonic conductivity of nano-structured yttria-stabilized zirconia: dependence on grain size
    Journal of materials chemistry, 20, 990-994 (2010)
    [DOI: 10.1039/b919100c]
  • Martin, Manfred; De Souza, Roger A.; Samuelis, Dominik; Börger, Alexander; Valov, Ilia; Becker, Klaus-Dieter; Janek, Jürgen; Schmidt, Peter; Nagarajan, Lakshmi
    Verfahren zur Erzeugung eines Leiter-Nichtleiter-Übergangs
    (2009)
  • De Souza, Roger A.
    The formation of equilibrium space-charge zones at grain boundaries in the perovskite oxide SrTiO3
    Physical chemistry, chemical physics : PCCP, 11, 9939-9969 (2009)
    [DOI: 10.1039/b904100a]
  • De Souza, Roger A.; Martin, Manfred
    Probing Diffusion Kinetics with Secondary Ion Mass Spectrometry
    MRS bulletin, 34, 907-914 (2009)
    [DOI: 10.1557/mrs2009.212]
  • Litzelman, Scott J.; De Souza, Roger A.; Butz, Benjamin; Tuller, Harry L.; Martin, Manfred; Gerthsen, Dagmar
    Heterogeneously doped nanocrystalline ceria films by grain boundary diffusion : impact on transport properties
    Journal of electroceramics, 22, 405-415 (2009)
    [DOI: 10.1007/s10832-008-9445-y]
  • De Souza, Roger A.; Martin, Manfred
    An atomistic simulation study of oxygen-vacancy migration in perovskite electrolytes based on LaGaO3
    Monatshefte für Chemie = Chemical monthly, 140, 1011-1015 (2009)
    [DOI: 10.1007/s00706-009-0120-z]
  • Kim, Sangtae; Avila-Paredes, Hugo J.; Wang, Shizhong; Chen, Chien-Ting; De Souza, Roger A.; Martin, Manfred; Munir, Zuhair A.
    On the conduction pathway for protons in nanocrystalline yttria-stabilized zirconia
    Physical chemistry, chemical physics : PCCP, 11, 3035-3038 (2009)
    [DOI: 10.1039/b901623f]
  • Müller, David Nikolaus; De Souza, Roger A.; Brendt, Jochen; Samuelis, Dominik; Martin, Manfred
    Oxidation states of the transition metal cations in the highly nonstoichiometric perovskite-type oxide Ba0.1Sr0.9Co0.8Fe0.2O3-delta
    Journal of materials chemistry, 19, 1960-1963 (2009)
    [DOI: 10.1039/b819415g]
  • Quiroga, E.; Bensch, Wolfgang; Yu, Z.; Aceves, Mariano; De Souza, Roger A.; Martin, Manfred; Zaporojtchenko, V.
    Structural characteristics of a multilayer of silicon rich oxide (SRO) with high Si content prepared by LPCVD
    Physica status solidi / A, Applications and materials science, 206, 263-269 (2009)
    [DOI: 10.1002/pssa.200824365]
  • De Souza, Roger A.; Martin, Manfred
    Using 18O/16O exchange to probe an equilibrium space-charge layer at the surface of a crystalline oxide: method and application
    Physical chemistry, chemical physics : PCCP, 10, 2356-2367 (2008)
    [DOI: 10.1039/b719618k]
  • Fischer, Horst; De Souza, Roger A.; Wätjen, Anja; Richter, Silvia; Edelhoff, Daniel; Mayer, Joachim; Martin, Manfred; Telle, Rainer
    Chemical strengthening of a dental lithium disilicate glass–ceramic material
    Journal of biomedical materials research / Part A, 87, 582-587 (2008)
    [DOI: 10.1002/jbm.a.31798]
  • Fielitz, Peter; Borchardt, Günter; De Souza, Roger A.; Martin, Manfred; Masoud, Muayad; Heitjans, Paul
    Oxygen-18 surface exchange and diffusion in Li2O-deficient single crystalline lithium niobate
    Solid state sciences : SSS, 10, 746-753 (2008)
    [DOI: 10.1016/j.solidstatesciences.2007.11.020]
  • Körfer, Sylvia; De Souza, Roger A.; Yoo, Han-Ill; Martin, Manfred
    Diffusion of Sr and Zr in BaTiO3 single crystals
    Solid state sciences : SSS, 2008, 725-734 (2008)
    [DOI: 10.1016/j.solidstatesciences.2007.06.017]
  • Yoo, Han-Ill; Lee, Chung-Eun; De Souza, Roger A.; Martin, Manfred
    Equal mobility of constituent cations in BaTiO3
    Applied physics letters, 92, 252103 (2008)
    [DOI: 10.1063/1.2951606]
  • Nagarajan, Lakshmi; De Souza, Roger A.; Samuelis, Dominik; Valov, Ilia; Börger, Alexander; Janek, Jürgen; Becker, Klaus-Dieter; Schmidt, Peter C.; Martin, Manfred
    A chemically driven insulator–metal transition in non-stoichiometric and amorphous gallium oxide
    Nature materials, 6, 391-398 (2008)
    [DOI: 10.1038/nmat2164]
  • De Souza, Roger A.; Pietrowski, Martha Joanna; Anselmi-Tamburini, Umberto; Kim, Sangtae; Munir, Zuhair A.; Martin, Manfred
    Oxygen diffusion in nanocrystalline yttria-stabilized zirconia : the effect of grain boundaries
    Physical chemistry, chemical physics : PCCP, 10, 2067-2072 (2008)
    [DOI: 10.1039/b719363g]
  • Kienle, Lorenz; Johrendt, Dirk; De Souza, Roger A.
    Trendbericht : Festkörperchemie 2006
    Nachrichten aus der Chemie, 55, 243-251 (2007)
    [DOI: 10.1002/nadc.20050530310]
  • De Souza, Roger A.; Maier, J.
    Capacitance of single crystal and low-angle tilt bicrystals of Fe-doped SrTiO3
    Faraday discussions, 134, 235-245 (2007)
    [DOI: 10.1039/b602914k]
  • De Souza, Roger A.; Martin, Manfred
    Secondary ion mass spectrometry (SIMS) : a powerful tool for studying mass transport over various length scales
    Physica status solidi / C, Current topics in solid state physics, 4, 1785-1801 (2007)
    [DOI: 10.1002/pssc.200675227]
  • Valov, Ilia; De Souza, Roger A.; Wang, C. Z.; Börger, Alexander; Korte, Carsten; Martin, Manfred; Becker, K.-D.; Janek, Jürgen
    Preparation of nitrogen-doped YSZ thin films by pulsed laser deposition and their characterization
    Journal of materials science : JMS, 42, 1931-1941 (2007)
    [DOI: 10.1007/s10853-006-0174-9]
  • Valov, Ilia; Korte, Carsten; De Souza, Roger A.; Martin, Manfred; Janek, Jürgen
    Electrochemical Incorporation of Nitrogen into a Zirconia Solid Electrolyte
    Electrochemical and solid state letters, 9, F23-F26 (2006)
    [DOI: 10.1149/1.2183888]
  • De Souza, Roger A.
    A universal empirical expression for isotope surface exchange coefficients (k*) of acceptor-doped perovskite and fluorite oxides
    Physical chemistry, chemical physics : PCCP, 21, 890-897 (2006)
    [DOI: 10.1039/b511702j]
  • De Souza, Roger A.; Martin, Manfred
    Secondary ion mass spectrometry - SIMS : a powerful tool for studying elemental distributions over various length scales
    Bunsen-Magazin, 8, 109-120 (2006)
  • De Souza, Roger A.; Meyer, R.
    Comment on 'Atomic-scale model of the grain boundary potential in perovskite oxides'
    Physical review / B, Condensed matter and materials physics, 72, 056101 (2005)
    [DOI: 10.1103/PhysRevB.72.056101]
  • De Souza, Roger A.; Zehnpfenning, J.; Martin, Manfred; Maier, J.
    Determining oxygen isotope profiles in oxides with Time-of-Flight SIMS
    Solid state ionics, 176, 1465-1471 (2005)
    [DOI: 10.1016/j.ssi.2005.03.012]
  • De Souza, Roger A.; Fleig, Jürgen; Maier, Joachim; Zhang, Zaoli; Sigle, Wilfried; Rühle, Manfred
    Electrical resistance of low-angle tilt grain boundaries in acceptor-doped SrTiO3 as a function of misorientation angle
    Journal of applied physics, 97, 053502 (2005)
    [DOI: 10.1063/1.1853495]
  • De Souza, Roger A.; Chater, R. J.
    Oxygen exchange and diffusion measurements : the importance of extracting the correct initial and boundary conditions
    Solid state ionics, 176, 1915-1920 (2005)
    [DOI: 10.1016/j.ssi.2005.05.010]
  • Ruiz-Trejo, Enrique; De Souza, Roger A.
    Dopant substitution and oxygen migration in the complex perovskite oxide Ba3CaNb2O9: A computational study
    Journal of solid state chemistry, 178, 1959-1967 (2005)
    [DOI: 10.1016/j.jssc.2005.04.002]
  • Zhang, Zaoli; Sigle, Wilfried; De Souza, Roger A.; Kurtz, Wolfgang; Maier, Joachim; Rühle, Manfred
    Comparative studies of microstructure and impedance of small-angle symmetrical and asymmetrical grain boundaries in SrTiO3
    Acta materialia, 53, 5007-5015 (2005)
    [DOI: 10.1016/j.actamat.2005.07.015]
  • De Souza, Roger A.; Martin, Manfred
    Secondary ion mass spectrometry: A powerful tool for diffusion studies in solids
    Archives of metallurgy and materials, 49, 431-446 (2004)
  • De Souza, Roger A.
    Ionen in Perovskit Oxiden : wie leicht springen sie?
    RWTH-Themen : Berichte aus der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2004, 16-18 (2004)
  • De Souza, Roger A.; Maier, J.
    A computational study of cation defects in LaGaO3
    Physical chemistry, chemical physics : PCCP, 5, 740-748 (2003)
    [DOI: 10.1039/b209062g]
  • Meyer, R.; De Souza, Roger A.
    The different origins of grain-boundary resistance in acceptor-doped and donor-doped SrTiO3
    Interfaces in electronic materials : proceedings of the international symposium ; [Symposium on Interfaces in Electronic Materials, held during the joint annual meetings of the Electrochemical Society and the Electronics Division of the American Ceramic Society, October 12 - 16, 2003 in Orlando, Florida] / sponsoring divisions: Electronics and Photonics, Dielectric Science and Technology, High Temperature Materials. Ed.: L. Cook ..., 220-234 (2003)