Person

Dr. rer. nat.

Andreas Falkenstein

Address

 

Research Interest:

  • Tracer Diffusion in β-Gallium oxide
  • Isotope Exchange Experiments
  • Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS)
  • Radiotracer Diffusion
  • Gamma-Ray Detection of Electron Capture Decay
  • Resistive Switching in amorphous substoichiometric Gallium Oxide
  • FEM of drift and diffusion in GaOx
  • Thermoelectricity of GaOx
  • Electrical Conductivity Relaxation (Oxidation/Reduction and De-/Hydration)
  • Defect Chemistry of LiMn2O4

Publications:

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


Conference contributions:


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

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

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

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 (Oral presentation).

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 (Oral presentation).

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

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 (Poster presentation).


Teaching:

  • Exercises Physical Chemistry I for Teachers (WS2012/13 - WS2014/15)
  • Exercises Physical Chemistry II for Teachers (SS2013 - SS2020)
  • Practical Course: Electrical Conductivity Relaxation, PC II, WS2015/16, WS2017/18, WS2018/19, WS2020/21

Safety representative at Chair of Physical Chemistry I