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首页> 外文期刊>日本セラミックス協会学術論文誌 >Effect of Powder Oxidation on Thermoelectric Properties of Fe-Si Alloys
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Effect of Powder Oxidation on Thermoelectric Properties of Fe-Si Alloys

机译：粉末氧化对铁硅合金热电性能的影响

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摘要

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 deg C and 650 deg C, in air. The Seebeck coefficient and electrical conductivity were measured in the range of 100-600 deg C and the effect of oxygen on thermoelectricity was clarified. Oxygen gave rise to an increase of the fraction of a residual metallic #epsilon#-phase, lowering the Seebeck coefficient. Addition of oxygen to FeSi_2 prevented both densification during sintering and transformation from metallic phases to semiconducting #beta#-phase during annealing treatment. Electrical conductivity of FeSi_2 was dependent on the quantity of residual #epsilon#-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.
机译：通过在空气中550℃和650℃下热氧化FeSi_2，Fe_（0.95）Mn_（0.05）Si_2和Fe_（0.95）Co_（0.05）Si_2粉末，将氧气掺入Fe-Si合金烧结体中。在100-600℃的范围内测量塞贝克系数和电导率，并阐明了氧对热电的影响。氧气增加了残留的＃ε相的分数，从而降低了塞贝克系数。向FeSi_2中添加氧气既可以防止烧结过程中的致密化，也可以防止在退火处理过程中从金属相转变为半导体＃beta＃相。 FeSi_2的电导率取决于烧结样品中残留的＃ε＃相，SiO_2和孔隙率。在中等温度范围内，极化子模型可以用来解释塞贝克系数随温度的变化。

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