Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.33: Poster
Monday, March 16, 2020, 18:15–20:00, P4
Investigating the short-range order (SRO) of glassy Ge15Te85 and GeSe obtained by TEM diffractometry — •Christian Stenz, Julian Pries, and Matthias Wuttig — Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany
In contrast to the crystalline phase, in the amorphous glassy and undercooled-liquid phase atoms show no long-range order and have no periodic structure. Still, atoms in amorphous solids exhibit a certain short-range order (SRO), which can be inferred from diffractometry. Here, transmission electron microscopy (TEM) is utilized in order to acquire selective area electron diffraction (SAED) patterns of as-deposited amorphous Ge15Te85 and GeSe. The 2D diffraction patterns acquired are circularly integrated to obtain 1D diffraction profiles. From these diffraction profiles the pair distribution functions (PDFs) are calculated using SUePDF providing insight on the SRO. After background substraction, algebraic redefining and normalization, the PDF is obtained by a Fourier transformation of the 1D diffraction pattern. The PDFs are compared to the expected atomic distances of the crystalline phase by a MATLAB program, which outputs the corresponding PDF computed from the unit cell.