FeTe_2化合物快速制备及电学输运性能  

Rapid Preparation and Electrical Transport Properties of Compound FeTe_2

作　　者：秦丙克[1,2] 籍永华[2] 宿太超[3] 白志玲[2] 黄润[1] 张金柱[1] Qin Bingke;Ji Yonghua;Su Taichao;Bai Zhiling;Huang Run;Zhang Jinzhu(Guizhou University,Guiyang 550025,China;Liupanshui Normal University,Liupanshui 553004,China;Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]贵州大学,贵州贵阳550025 [2]六盘水师范学院,贵州六盘水553004 [3]河南理工大学,河南焦作454000

出　　处：《稀有金属材料与工程》2019年第3期931-935,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51764005);贵州省教育厅基金项目(黔教合KY字[2016]102号)

摘　　要：利用真空高温烧结的方法,在803.15～923.15 K的温度范围内快速合成了单相的合金化合物FeTe_2。在制备温度为863.15 K时,考查了不同保温时间对制备单相样品FeTe_2的影响规律。制备出的样品进行了XRD和SEM分析,并在室温下对样品进行了电阻率和Seebeck系数的测试分析。结果表明:在803.15～923.15 K的温度范围内,采用高温烧结反应能够快速制备出单相的多晶体化合物FeTe_2;制备出样品内部均匀存在许多微米级的孔洞。经室温电学性质测试,样品在制备温度为863.15 K保温时间60 min时获得最大Seebeck系数88.21μV/K。当制备温度为803.15 K,保温时间30 min时,获得最小电阻率为7.86 mΩ·cm。样品在制备温度923.15 K,保温30 min时,获得最大功率因子53.82μW/(m·K^2)和最大ZT值为0.0076。Single-phase alloy compound FeTe2 was rapidly synthesized in the temperature range of 803.15~923.15 K by vacuum high temperature sintering.At the preparation temperature of 863.15 K,the effect of different holding time on the preparation of single phase FeTe2 was investigated.The crystallographic properties and microstructure were characterized by X-ray diffraction and electron probe microanalysis,respectively.Seebeck coefficient and electrical resistivity were measured at room temperature.The results show that the single-phase polycrystalline compound FeTe2 can be rapidly prepared by a high-temperature sintering reaction in the temperature range of803.15~923.15 K.There are many micron-sized pores evenly inside the sample.The transport properties were measured at room temperature.The maximum Seebeck coefficient is 88.21μV/K when the preparation temperature is 863.15 K and holding time 60 min.When the preparation temperature is 803.15 K and the holding time 30 min,the minimum resistivity is 7.86 m?·cm.The maximum power factor is 53.82μW/(m·K^2)and the maximum ZT value is 0.0076 when the sample is prepared at 923.15 K temperature for 30 min.

关 键 词：热电材料 FeTe2 微观形貌 电学性质 

分 类 号：O47[理学—半导体物理] TN304[理学—物理]