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Effect of GaSb Addition and Sb Doping on the Thermoelectric Properties of Mg2Si0.5Sn0.5 Solid Solutions
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Effect of GaSb Addition and Sb Doping on the Thermoelectric Properties of Mg2Si0.5Sn0.5 Solid Solutions
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National Natural Science Foundation of China (50731006, 50971115, 51061120455)

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    摘要:

    利用B2O3助熔劑法結(jié)合熱壓法制備了Mg2Si0.487-2xSn0.5(GaSb)xSb0.013 (0.04 ≤ x ≤ 0.10)固溶體。X射線衍射結(jié)果表明樣品呈單相。Sb摻雜有效提高了樣品的電導(dǎo)率。隨溫度升高，Mg2Si0.487-2xSn0.5(GaSb)xSb0.013 (0.04 ≤ x ≤ 0.10)樣品的電導(dǎo)率降低而塞貝克系數(shù)升高。隨GaSb含量的增多，樣品的電導(dǎo)率呈現(xiàn)出先增大后減小的變化趨勢。所有樣品中Mg2Si0.287Sn0.5(GaSb)0.1Sb0.013具有最低晶格熱導(dǎo)率，其室溫晶格熱導(dǎo)率比Mg2Si0.5Sn0.5[11]低15%。由于電導(dǎo)率較高使Mg2Si0.327Sn0.5(GaSb)0.08Sb0.013具有最高熱電優(yōu)值，在720 K達(dá)到0.61，顯著高于基體Mg2Si0.5Sn0.5[11]的最高熱電優(yōu)值0.019

    Abstract:

    Mg2Si0.487-2xSn0.5(GaSb)xSb0.013 (0.04 ≤ x ≤ 0.10) solid solutions were synthesized by a B2O3 flux method followed by hot pressing. X-ray power diffraction analysis confirms that single-phased samples are obtained. It is found that the Sb-doping effectively enhances the electrical conductivity. The Seebeck coefficients increase while the electrical conductivity decreases for Mg2Si0.487-2xSn0.5(GaSb)xSb0.013 with the increase of temperature. With increasing of GaSb content the electrical conductivity first increases and then decreases. Among all the samples, Mg2Si0.287Sn0.5(GaSb)0.1Sb0.013 sample has the lowest lattice thermal conductivity which is about 15% lower than that of Mg2Si0.5Sn0.5 [11] at room temperature. A maximum dimensionless figure of merit of 0.61 at 720 K has been obtained for Mg2Si0.327Sn0.5(GaSb)0.08Sb0.013 mainly due to its high electrical conductivity, which is obviously higher than that (0.019 at 540 K) of Mg2Si0.5Sn0.5 [11]

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杜正良,崔教林,朱鐵軍,趙新兵. Effect of GaSb Addition and Sb Doping on the Thermoelectric Properties of Mg2Si0.5Sn0.5 Solid Solutions[J].稀有金屬材料與工程,2014,43(11):2623~2326.[Du Zhengliang, Cui Jiaolin, Zhu Tiejun, Zhao Xinbing. Effect of GaSb Addition and Sb Doping on the Thermoelectric Properties of Mg2Si0.5Sn0.5 Solid Solutions[J]. Rare Metal Materials and Engineering,2014,43(11):2623~2326.]
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  • 收稿日期:2013-11-20
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  • 在線發(fā)布日期: 2015-04-07
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