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Thermoelectric properties of GeTe at high hydrostatic pressure up to 8.5 GPa and its valence‐band structure
Author(s) -
Khvostantsev L. G.,
Sidorov V. A.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221160111
Subject(s) - orthorhombic crystal system , condensed matter physics , hydrostatic pressure , seebeck coefficient , materials science , crystallite , thermoelectric effect , phase transition , hydrostatic equilibrium , valence (chemistry) , electronic band structure , crystal structure , crystallography , thermodynamics , chemistry , physics , metallurgy , organic chemistry , quantum mechanics
The thermopower and the relative electrical resistance of rhombohedral α‐GeTe and orthorhombic γ‐GeTe polycrystalline samples with hole density between 3.9 × 10 20 and 2 × 10 21 cm −3 are measured under hydrostatic pressure up to 8.5 GPa at room temperature. The phase transition of α‐GeTe to the cubic rocksalt structure (β‐GeTe) reported earlier at 3.5 GPa under nonhydrostatic pressure is not observed up to 8.5 GPa. Orthorhombic γ‐GeTe also exhibits no phase transition. The pressure dependences of the thermopower provide support for the multiple valence‐band model of GeTe.