Fe-Si系合金の熱電変換物性に及ぼす粉末酸化の影響

概要

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Oxygen was incorporated into Fe-Si alloys sintered bodies by thermal oxidation of FeSi_2, Fe_<0.95>Mn_<0.05>Si_2 and Fe_<0.95>CO_<0.05>Si_2 powders at 550℃ and 650℃, in air. The Seebeck coefficient and electrical conductivity were measured in the range of 100-600℃ and the effect of oxygen on thermoelectricity was clarified. Oxygen gave rise to an increase of the fraction of a residual metallic ε-phase, lowering the Seebeck coefficient. Addition of oxygen to FeSi_2 prevented both densification during sintering and transformation from metallic phases to semiconducting β-phase during annealing treatment. Electrical conductivity of FeSi_2 was dependent on the quantity of residual ε-phase, SiO_2 and porosity in the sintered specimens. In an intermediate temperature range, polaron model could be applied to explain the variation of the Seebeck coefficient with temperature.
社団法人日本セラミックス協会の論文
2001-05-01