Ag/Sb比对(GeTe)85(AgySb2-yTe3-y)15合金热电性能的影响

材料科学与工程学报, 2013, 31(2): 204-207.

Ag/Sb比对(GeTe)85(AgySb2-yTe3-y)15合金热电性能的影响

金吉 ^1, , 朱铁军 ^2, , 刘晓华 ^3, , 赵新兵 ^4,

1.浙江大学材料科学与工程学系,硅材料国家重点实验室,浙江杭州 310027

2.浙江大学材料科学与工程学系,硅材料国家重点实验室,浙江杭州 310027

3.浙江大学材料科学与工程学系,硅材料国家重点实验室,浙江杭州 310027

4.浙江大学材料科学与工程学系,硅材料国家重点实验室,浙江杭州 310027

基金项目: 浙江省科技厅基金资助项目(2009C34007) 国家自然科学基金资助项目(50971115)

关键词：热电材料 , TAGS , 热导率 , 电导率

Effect of Ag/Sb Ratio on the Thermoelectric Properties of (GeTe) 85 (AgySb2-yTe3-y)15 TAGS Alloys

按不同Ag/Sb比制备了(GeTe)85(AgySb2-yTe3-y)15(y=1.0,1.02,1.2,1.3,1.5)系列TAGS热电材料,发现偏化学计量比的样品中有Ag8 GeTe6低热导率第二相的析出.改变Ag/Sb比能显著降低材料的晶格热导率,y=1.3样品的晶格热导率在700K约为基体相的40％.样品的电导率随着y值的增加先增加后减小,Seebeck系数随成分的变化规律与电导率相反,随着Ag/Sb比增加而减小.y=1.02样品在744K时获得最大ZT值1.37,与等化学计量比y=1.0样品相比提高了10％左右,且随着温度的进一步升高,2T值有继续上升的趋势.

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