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首页> 外文期刊>Materials Letters >Phase transformation and thermoelectric properties of n-type Fe_(0.98)Co_(0.02)Si_2 processed by mechanical alloying
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Phase transformation and thermoelectric properties of n-type Fe_(0.98)Co_(0.02)Si_2 processed by mechanical alloying

机译：机械合金化处理n型Fe_（0.98）Co_（0.02）Si_2的相变和热电性能

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摘要

n-type Fe_(0.98)Co_(0.02)Si_2 powders have been produced by mechanical alloying process and consolidated by vacuum hot pressing. As-milled powders were of metastable state and fully transformed to β-FeSi_2 phase by subsequent isothermal annealing. However, as-consolidated iron silicides consisted of untransformed mixture of α-Fe_2Si_5 and ε-FeSi phases. Isothermal annealing has been carried out to induce the transformation to a thermoelectric semiconducting β-FeSi_2 phase. The transformation behavior of β-FeSi_2 was investigated by utilizing DTA, a modified TGA, SEM and XRD analyses. Isothermal annealing at 830℃ in vacuum led to the thermoelectric semiconducting β-FeSi_2 phase transformation, but some residual metallic α- and a-phases were unavoidable even after 96 h of annealing. Microstructures of iron silicides were investigated using SEM and TEM. Thermoelectric properties of β-FeSi_2 materials before and after isothermal annealing were evaluated in this study. It was shown that thermoelectric properties were remarkably enhanced by isothermal annealing due to the transformation from metallic α- and ε-phases to semiconducting β-phases.
机译：通过机械合金化工艺制备了n型Fe_（0.98）Co_（0.02）Si_2粉末，并通过真空热压进行固结。研磨后的粉末处于亚稳态，并通过随后的等温退火完全转变成β-FeSi_2相。但是，固结的硅化铁由α-Fe_2Si_5和ε-FeSi相的未转化混合物组成。已经进行了等温退火以诱导向热电半导体β-FeSi_2相的转变。利用DTA，改进的TGA，SEM和XRD分析研究了β-FeSi_2的转变行为。 830℃真空等温退火导致β-FeSi_2热电半导体相变，但即使退火96h仍不可避免地会残留一些金属α相和α相。用SEM和TEM研究了硅化铁的微观结构。本研究评估了β-FeSi_2材料在等温退火前后的热电性能。结果表明，由于金属α相和ε相向半导体β相的转变，等温退火显着提高了热电性能。

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