Person

Dr. rer. nat.

Andreas Falkenstein

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Adresse

 

Forschungsinteresse:

  • Tracerdiffusion in β-Galliumoxid
  • Isotopenaustauschexperimente
  • Flugzeit-Sekundärionenmassenspektrometrie (ToF-SIMS)
  • Radiotracer-Diffusion
  • Gammastrahlendetektion von Elektroneneinfang-Zerfallsreaktionen
  • Resistives Schalten in amorphem unterstöchiometrischem Galliumoxid
  • FEM-Simulation von Drift und Diffusion in GaOx
  • Thermoelektrizität von GaOx
  • Elektrische Leitfähigkeitsrelaxation (Oxidation/Reduktion und De-/Hydratisierung)
  • Defektchemie von LiMn2O4


Veröffentlichungen:

Transition between bipolar and abnormal bipolar resistive switching in amorphous oxides with a mobility edge DOI: 10.1038/s41598-021-93777-6

Isotopic study of Raman active phonon modes in β-Ga2O3. DOI: 10.1039/D0TC04101G

Offcut-related step-flow and growth rate enhancement during (100) β-Ga2O3 homoepitaxy by metal-exchange catalyzed molecular beam epitaxy (MEXCAT-MBE), DOI: 10.1063/5.0031300

A quantitative analysis of two-fold electrical conductivity relaxation behaviour in mixed proton–oxide-ion–electron conductors upon hydration, DOI: 10.1039/D0CP03264F

An innovative approach to design SOFC air electrode materials: high entropy La1-xSrx(Co,Cr,Fe,Mn,Ni)O3-δ (x = 0, 0.1, 0.2, 0.3) perovskites synthesized by the sol–gel method, DOI: 10.1039/d0ta06356h

Substrate-orientation dependence of β-Ga2O3 (100), (010), (001), and (-201) homoepitaxy by indium-mediated metal-exchange catalyzed molecular beam epitaxy (MEXCAT-MBE), DOI: 10.1063/1.5135772

Transport Kinetics of Hydrogen Permeable Lanthanum Tungstate, DOI: 10.18154/RWTH-2017-02136

Chemical relaxation experiments on mixed conducting oxides with large stoichiometry deviations,
DOI: 10.1016/j.ssi.2015.07.023


Konferenzbeiträge:


Transport Kinetics of Hydrogen Permeable Lanthanum Tungstate, A. Falkenstein, M. Martin, 2019, Diffusion in Solids and Liquids, Athen, Griechenland (Vortrag).

22nd International Conference on Solid State Ionics, 2019, Pyeongchang, Korea.

10th Joint Korean-German Conference ‘Engineering for our Future!’ , 2018, Aachen, Deutschland (Konferenzorganisation).

The 9th International Symposium on Materials in External Fields, 2018, Seoul, Korea.

Transport Kinetics of Proton Conductors by means of ECR, A. Falkenstein, M. Martin, 2018, Bunsentagung, Hannover, Deutschland (Vortrag).

Analysis of Electrical Conductivity Relaxation Curves of Proton Conducting Lanthanum Tungstate, A. Falkenstein, M. Martin, 2017, 21st International Conference on Solid State Ionics, Padua, Italien (Vortrag).

Transport kinetics of the mixed conductor lanthanum tungstate, A. Falkenstein, M. Martin, 2015, 20th International Conference on Solid State Ionics, Keystone, USA (Posterpräsentation).

ECR on oxides with large nonstoichiometry deviations, A. Falkenstein, D.N. Mueller, R.A. De Souza, M. Martin, 2013, Inorganic Membranes Summer School, Valencia, Spanien (Posterpräsentation).


Lehre:

  • Übung zur Vorlesung Physikalische Chemie I für Lehramt (WS2012/13 - WS2014/15)
  • Übung zur Vorlesung Physikalische Chemie II für Lehramt (SS2013 - SS2020)
  • Praktikumsversuch „Elektrische Leitfähigkeitsrelaxation“ im PC-F-Praktikum, WS2015/16, WS2017/18, WS2018/19, WS2020/21

Sicherheitsbeauftragter am Lehrstuhl für Physikalische Chemie 1