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Updated: Dec 11, 2025

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
Published on: October 24, 2017
New insights on the GeSexTe1-x phase diagram from theory and experiment
Markus Guido Herrmann1, Ralf Peter Stoffel2, Michael Küpers2
1Jülich Centre for Neutron Science-2/Peter Grünberg Institute-4, Forschungszentrum Jülich GmbH, Wilhelm-Johnen Strasse, Jülich 52428, Germany.
Abstract:
The high-pressure and low-temperature behaviour of the GeSexTe1-x system (x = 0, 0.2, 0.5, 0.75, 1) was studied using a combination of powder diffraction measurements and first-principles calculations. Compounds in the stability field of the GeTe structure type (x = 0, 0.2, 0.5) follow the high-pressure transition pathway: GeTe-I (R3m) → GeTe-II (f.c.c.) → GeTe-III (Pnma). The newly determined GeTe-III structure is isostructural to β-GeSe, a high-pressure and high-temperature polymorph of GeSe. Pressure-dependent formation enthalpies and stability regimes of the GeSexTe1-x polymorphs were studied by DFT calculations. Hexagonal Ge4Se3Te is stable up to at least 25 GPa. Significant differences in the high-pressure and low-temperature behaviour of the GeTe-type structures and the hexagonal phase are highlighted. The role of Ge...Ge interactions is elucidated using the crystal orbital Hamilton population method. Finally, a sketch of the high-pressure phase diagram of the system is provided.
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