Structure and electrical properties of Sb^sub 2^Te^sub 3^ and Bi^sub 0.4^Sb^sub 1.6^Te^sub 3^ metastable phases obtained by HPHT treatment

• Published in: High pressure research Vol. 31; no. 1; p. 86
• Main Authors: Buga, Sergei G, Serebryanaya, Nadejda R, Dubitskiy, Gennadii A, Semenova, Elena E, Aksenenkov, Viktor V, Blank, Vladimir D
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis Ltd 01-03-2011
• Subjects: Alloys; Comparative analysis; Conductivity; Electric resistance; Electrons; Temperature
• ISSN: 0895-7959; 1477-2299

We have obtained the metastable phase of the thermoelectric alloy ... with electron type conductivity for the first time using the method of quenching under pressure after treatment at P=4.0 GPa and T=400-850 °C. We have consequently performed comparative studies with the similar phase of ... The polycrystalline X-ray diffraction patterns of these phases are similar to the known monoclinic structure α-... (C2/m) with less monoclinic distortion, β ... 92°. We have measured the electrical resistivity and the Hall coefficient in the temperature range of T=77-450 K and we have evaluated the Hall mobility and density of charge carriers. The negative Hall coefficient indicates the dominant electron type of carriers at temperatures up to 380 K in the metastable phase of ... and up to 440 K in the metastable state of ... Above these temperatures, the p-type conductivity proper to the initial phases dominates. (ProQuest: ... denotes formulae/symbols omitted.)