方钴矿化合物Fe_xCo_(4-x)Sb_(12)的高温高压合成及其电输运特性研究  

HPHT synthesis and electrical transport properties of Fe_xCo_(4-x)Sb_(12) skutterudite compounds

作　　者：马红安[1] 董楠[1] 宿太超[1] 于凤荣[2] 田永君[2] 姜一平[1] 邓乐[1] 贾晓鹏[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,长春130012 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《原子与分子物理学报》2009年第4期748-752,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(50731006;50801030);吉林大学985工程研究生创新基金(20080219)

摘　　要：采用高压合成技术,在1.5 GPa,900 K的合成压力和温度条件下成功合成出了系列Fe置换掺杂型方钴矿化合物Fe_xCo_4-xSb_12,其中x=0,0.2,0.6,0.8.详细研究了Fe_xCo_4-xSb_12样品在300 K～700 K温度范围内的电阻率、Seebeck系数和功率因子(S^2σ)随温度和Fe掺杂量的变化关系.研究结果表明:在测试温度范围内,随着温度的升高,样品的电阻率和Seebeck系数逐渐增大.随着Fe含量的增加,样品的电阻率和Seebeck系数先增加后减小.与常压下相同样品比较。高压合成方法制备的样品的电学输运特性有了明显的提高.上述研究结果表明,高压合成技术在制备热电材料方面能够有效地提高样品的电输运特性.Fe doped CoSb3 Skutterudite compounds FexCo4-xSb12 with x= 0, 0.2, 0. 6, 0.8 were synthe- sized at 1.5 GPa and 900 K by high pressure synthesis method. The electrical transport properties including electrical resistivity, Seebeck coefficient were measured at 300 K - 700 K. The results show that with the temperature increasing the electrical resistivity and Seebeck coefficient increase; with the increase of Fe adding content, the electrical resistivity and Seebeck coefficient increase first and then decrease. Compared with the same samples prepared by ambient pressure method, the electrical transport properties improve obviously. The experimental results further show that high pressure synthesis is a potent and effective method for preparing thermal electrical materials.

关 键 词：电学性质 FexC04-xSb12 高压合成 

分 类 号：O521.2[理学—高压高温物理]