Publications PD Dr. Roger A. De Souza

Showing 51 - 100 of 107 Results

  • Source
  • 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]