Order-disorder phenomena and phase transitions

The physical properties of ferromagnetic Heusler alloys or semiconducting oxide layers, for example, depend on their structural order and phase stability. The underlying physical principles of phase stabilities and phase transformation processes are explored with high spatial and temporal resolution in dependence on internal parameters like chemical composition and strain state as well as external parameters given by temperature and growth kinetics. The degree of order/disorder and their spatial distribution within thin films are determined quantitatively by in-situ and ex-situ X-ray diffraction and electron microscopy methods.


Our research is currently focused on the following topics:

  • Ordering phenomena and phase transitions in metastable Ge-Fe alloys
  • Structural phase transition in epitaxial semiconducting oxides
  • In-situ x-ray diffraction PHARAO and in-situ transmission electron microscopy studies on phase transitions

Selected Publications

5 Author M. Terker , B. Jenichen , J. Herfort , A. Trampert

In-situ transmission electron microscopy of solid phase epitaxy of Ge on Fe3Si

Source Semicond. Sci. Technol. , 34 , 124004 ( 2019 )
DOI : 10.1088/1361-6641/ab4fad | 3148 Cite : Bibtex RIS
M. Terker, B. Jenichen, J. Herfort, and A. Trampert

4 Author K. Berlin , A. Trampert

Phase Stability and Anisotropic Sublimation of Cubic Ge−Sb−Te Alloy Observed by In Situ Transmission Electron Microscopy

Source J. Phys. Chem. C , 122 , 2968 ( 2018 )
DOI : 10.1021/acs.jpcc.7b09855 | 3061 Cite : Bibtex RIS
K. Berlin, and A. Trampert

3 Author B. Jenichen , M. Hanke , S. Gaucher , A. Trampert , J. Herfort , H. Kirmse , B. Haas , E. Willinger , X. Huang , S. C. Erwin

Ordered structure of FeGe2 formed during solid-phase epitaxy

Source Phys. Rev. Mater. , 2 , 051402 ( 2018 )
DOI : 10.1103/PhysRevMaterials.2.051402 | 3025 Cite : Bibtex RIS
B. Jenichen, M. Hanke, S. Gaucher, A. Trampert, J. Herfort, H. Kirmse, B. Haas, E. Willinger, X. Huang, and S. C. Erwin

2 Author Z. Cheng , M. Hanke , P. Vogt , O. Bierwagen , A. Trampert

Phase formation and strain relaxation of Ga2O3 on various sapphire orientations as studied by synchrotron-based x-ray diffraction

Source Appl. Phys. Lett. , 111 , 162104 ( 2017 )
DOI : 10.1063/1.4998804 | Download: PDF | 2948 Cite : Bibtex RIS
Z. Cheng, M. Hanke, P. Vogt, O. Bierwagen, and A. Trampert

1 Author K. Berlin , A. Trampert

Liquid-solid phase transition of Ge-Sb-Te alloy observed by in-situ transmission electron microscopy

Source Ultramicroscopy , 178 , 27 ( 2017 )
DOI : 10.1016/j.ultramic.2016.10.010 | 2883 Cite : Bibtex RIS
K. Berlin, and A. Trampert


Dr. Achim Trampert

Head of Department 

+49 30 20377-280