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Thermoelectric Properties of Non-Stoichiometric MnTe Compounds
김봉서,Inhye Kim,민복기,오민욱,박수동,이희웅 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
Non-stoichiometric MnxTe1-x (x = 0.48-0.52) has been prepared by a melt-quench process followed by sparkplasma-sintering to investigate its thermoelectric properties. Polycrystalline MnxTe1-x with x > 0.51 has a nearly single MnTe phase. The measured Seebeck coefficient and electrical conductivity show a similar trend, in which a transition occurs near 473 K with increasing temperature. The thermal conductivity of MnxTe1-x compounds shows a tendency to decrease with increasing Mn content. Along with a low thermal conductivity and a high power factor, the samples with x > 0.51 have a high figure of merit, which reaches 0.41 at 773 K. The results indicate that production of a homogenous MnTe single phase is an effective way to improve the thermoelectric properties of p-type non-stoichiometric MnxTe1-x compounds