Influence of pre-annealing and Mn + Al double doping on the microstructure and thermoelectric properties of iron disilicide

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI:10.1109/ICT.2006.331230

H. Chen, X.B. Zhao, Z. M. He, C. Stiewe, E. Muller

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引用次数: 4

Abstract

Iron disilicide based thermoelectric materials with the designed composition Fe_1-xMn_xAl_ySi_2-y (x = 0.06, 0.08; y = 0, 0.02, 0.04) were prepared by rapid solidification and hot pressing (1193K, 100 MPa, 30 minutes). The effects of Mn+Al double doping were investigated. The influence of pre-annealing on the microstructure and the transport properties were also studied. X-ray diffraction and scanning electron microscopy show that after pre-annealing at 800degC for only 10 hours, the high temperature phases (alpha-Fe₂Si₅ and epsiv-FeSi) in the rapidly solidified powders Fe_1-xMn_xAl_ySi_2-y have been completely transformed to (beta-FeSi₂ phase for y = 0 and y = 0.02. It is found that the grain growth during hot pressing was suppressed for the pre-annealed samples. For the pressed compacts, the Seebeck coefficient was markedly enhanced by the pre-annealing treatment, while both the electrical conductivity and the thermal conductivity were decreased. Mn+Al double doping improves the electrical conductivity, but deteriorates the Seebeck coefficient and the thermal conductivity. The maximum of the figure of merit (ZT = 0.20) is obtained at 890 K for the sample double doped with y = 0.04 (Fe_0.94Mn_0.06Al_0.02Si_1.98) that is hot pressed from pre-annealed powders

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预退火和Mn + Al双掺杂对二硅化铁微观结构和热电性能的影响

设计成分为Fe1-xMnxAlySi2-y (x = 0.06, 0.08;y = 0, 0.02, 0.04)，采用快速凝固和热压(1193K, 100 MPa, 30 min)法制备。研究了Mn+Al双掺杂的影响。研究了预退火对合金微观组织和输运性能的影响。x射线衍射和扫描电镜结果表明，快速凝固的Fe1-xMnx AlySi2-y粉末在800℃预退火仅10小时后，在y = 0和y = 0.02时，高温相(α - fe2si5和epsiv-FeSi)已经完全转变为(β - fesi2)相。结果表明，预退火试样在热压过程中晶粒的生长受到抑制。预退火处理能显著提高压坯的塞贝克系数，降低其导电性和导热性。Mn+Al双掺杂提高了材料的导电性，但降低了材料的塞贝克系数和导热系数。在890 K时，双掺y = 0.04 (Fe0.94Mn0.06Al0.02Si1.98)的样品在预退火粉末中热压得到最大品质系数(ZT = 0.20)

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2006 25th International Conference on Thermoelectrics

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