Author： Buga Sergei Serebryanaya Nadejda Dubitskiy Gennadii Semenova Elena Aksenenkov Viktor Blank Vladimir
Publisher： Taylor & Francis Ltd
ISSN： 0895-7959
Source： International Journal of High Pressure Research, Vol.31, Iss.1, 2011-03, pp. : 86-90
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Abstract
We have obtained the metastable phase of the thermoelectric alloy Bi0.4Sb1.6Te3 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 Sb2Te3. The polycrystalline X-ray diffraction patterns of these phases are similar to the known monoclinic structure α-As2Te3 (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 Sb2Te3 and up to 440 K in the metastable state of Bi0.4Sb1.6Te3. Above these temperatures, the p-type conductivity proper to the initial phases dominates.
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