含稀土硅化铁热电材料的电学性能初探  

Electrical Properties of Iron Disilicide Thermoelectric Materials Containing Samarium

作　　者：赵新兵[1] 朱铁军[1] 李伟文[1] 邬震泰[1] 

机构地区：[1]浙江大学,浙江杭州310027

出　　处：《稀有金属材料与工程》2003年第5期344-347,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基资助(59971044)

摘　　要：采用悬浮真空熔炼和800℃,168h真空退火方法制备了含稀土Sm的FeSi2基金属硅化物,并对其晶体结构、See-beck系数、电阻率进行了初步研究。实验发现,名义组成为Fe0.6Sm0.4Si2的试样的热电功率因子从室温时的0.26×10-4W·m-1K-2随温度上升到500℃时的1.6×10-4W·m-1K-2,比不含Sm或含Sm量很少的对比试样高一个数量级左右。其原因被认为是由于Sm的外层4f电子的贡献。Iron disilicides containing rare-earth samarium have been prepared with vacuum levitation melting followed vacuum annealing at 800degreesC for 168h for the beta-phase transformation. The crystal structures, Seebeck coefficients, electrical resistivity and thermoelectric power factors of the alloys have been experimentally studied. It has been found that the power factors of the sample with the nominal composition of Fe0.6Sm0.4Si2 increase from 0.26 x 10(-4)Wm(-1)K(-2) at room temperature to 1.6 x 10(-4)Wm(-1)K(-2) at 500degreesC, which are about one order higher than those of the iron disilicides without samarium. It has been considered that the high power factors of the Fe0.6Sm0.4Si2 sample originate from the 4f-electrons of the rare-earth element.

关 键 词：热电材料 金属硅化物 稀土化合物 热电件能 

分 类 号：TB34[一般工业技术—材料科学与工程]