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Thermoelectric properties of the trigonal and orthorhombic modifications of zinc telluride

JETP Letters, ISSN: 0021-3640, Vol: 80, Issue: 1, Page: 35-38
2004
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Thermoelectric measurements are performed to study the phase transformations occurring in ZnTe under high pressure. It is shown that the thermoelectric power S of the cinnabar trigonal phase corresponds to a semiconductor with a hole-type conduction. In the Cmcm orthorhombic phase, the value of S ≈ +10 μV/K and the sign of the thermoelectric power testify to the metallic hole-type conduction, as in the high-pressure phases of other Group II chalcogenides (HgSe, HgTe, CdTe) with similar crystal lattices. In the transition region between the trigonal and orthorhombic phases, the pressure dependence of the thermoelectric power is found to exhibit an anomaly (a sharp dip), which leads to a change in the sign of S under decreasing pressure. This feature may presumably be related to the formation of the intermediate phase with the NaCl structure, which has an electron-type conduction in other zinc and cadmium chalcogenides.© 2004 MAIK "Nauka/Interperiodica".

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