Thermoelectric properties of germanium telluride in the neighborhood of the polymorphic and ferroelectric phase transition
DOI:
https://doi.org/10.24144/2415-8038.1997.1.73-77Abstract
In this work, single crystals and polycrystalline alloys in the Ge-Te system from the homogeneity region were obtained, the synthesis of which was carried out from especially pure initial components. Compared with the literature data, the samples had one or two orders of magnitude higher resistivity and not a metal, but a semiconductor character of the temperature dependence of conductivity. In single-crystal samples, the thermopower and thermoelectric figure of merit in the ferroelectric a phase transition have clearly pronounced maxima, and the thermopower has a maximum in the antiferroelectric a -> γ phase transition. For alloys, polymorphic transformations on thermoelectric properties are weakly expressed.
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