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利用粉末冷压成型及真空烧结制备了不同Bi掺杂量的Mg-Si-Sn-Bi材料,并对制备材料组成和热电性能进行研究.结果表明,制备材料由Mg2Sn、Mg2Si和Mg2(Si,Sn)固溶体相组成.随测试温度的增加,制备材料的电阻率都急剧减小,这是典型的半导体特征.在研究范围内,掺杂Bi元素含量增加,制备材料的电阻率开始逐渐减小,但Bi掺杂量增加到一定值后,材料的电阻率又增加,而且掺杂后的材料电阻率都低于未掺杂的.制备材料的Seebeck系数是负值,表明这些材料都为n型半导体.对于掺杂Bi的材料,随着测试温度由室温增加到730 K,测得的Seebeck系数绝对值开始时轻微增加,约在240~270 K达到最大值,再随着温度增加,Seebeck系数绝对值又显著单调减小.对于掺杂Bi元素的材料,随Bi掺杂量的增加,Seebeck系数的绝对值先减少后增加,这是掺杂造成载流子浓度增加和散射过程加大相互竞争的结果.掺杂Bi的Mg-Si-Sn材料的功率因子都高于未掺杂的材料,且Bi掺杂量增加,制备材料的功率因子显著增加.对于1.29at% Bi和1.63at% Bi掺杂量的材料,功率因子分别在500 K和530 K存在一个极大值.

参考文献

[1] Ting-Kuo Kang.Enhanced seebeck coefficient for a compressive n-type polysilicon film[J].Solid-State Electronics,2014Jan.(Jan.):24-27.
[2] Xing Wang;Hongcai He;Ning Wang;Lei Miao.Effects of annealing temperature on thermoelectric properties of Bi_2Te_3 films prepared by co-sputtering[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013Jul.1(Jul.1):539-542.
[3] Bashir, Mohamed Ali Bashir;Said, Suhana Mohd;Sabri, Mohd Faizul Mohd;Shnawah, Dhafer Abdulameer;Elsheikh, Mohamed Hamid.Recent advances on Mg2Si1-xSnx materials for thermoelectric generation[J].Renewable & sustainable energy reviews,2014Sep.(Sep.):569-584.
[4] Hu, Xiaokai;Barnett, Matthew R.;Yamamoto, Atsushi.Synthesis of Al-doped Mg2Si1-xSnx compound using magnesium alloy for thermoelectric application[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2015:1060-1065.
[5] Fan, Xi'an;Rong, Zhenzhou;Yang, Fan;Cai, Xinzhi;Han, Xuewu;Li, Guangqiang.Effect of process parameters of microwave activated hot pressing on the microstructure and thermoelectric properties of Bi2Te3-based alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2015:282-287.
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