铁-镍双掺杂方钴矿的合成与热电性能  

Synthesis and Thermoelectric Properties of Ni and Fe Double Doped Skutterudites

作　　者：李雨[1] 马雷强 郑睿[1] 雷鹰[1,2,3] 江孝武 谷峻 万润东 Li Yu;Ma Leiqiang;Zheng Rui;Lei Ying;Jiang Xiaowu;Gu Jun;Wan Rundong(Anhui University of Technology,Ma’anshan 243032,China;State key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;City University of Hong Kong,Tat Chee Avenue,Kowloon,Hong Kong,China;Kunming University of Science and Technology,Kunming 650504,China)

机构地区：[1]安徽工业大学,安徽马鞍山243032 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]香港城市大学,香港九龙达之路 [4]昆明理工大学,云南昆明650504

出　　处：《稀有金属材料与工程》2020年第7期2511-2516,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51974005,51574134,51574042);沈阳材料科学国家(联合)实验室与有色金属先进加工与再利用国家重点实验室联合基金(18LHPY016);安徽省高校优秀青年拔尖人才(重点项目)(gxyqZD2017039);香港城市大学战略研究项目(7005105)。

摘　　要：采用微波加热合成结合放电等离子体烧结制备了铁-镍双掺杂方钴矿Co3.8-xFexNi0.2Sb12(x=0.05,0.10,0.15,0.20)块体材料,并对其物相组成、晶粒尺寸、元素分布、热电性能等进行了系统研究。X射线衍射分析表明,样品X射线衍射峰与单相CoSb3相符;场发射扫描电镜分析表明,样品晶粒尺寸为1~3μm、平均尺寸为1~2μm,各元素均匀分布;电性能分析表明,Ni/Fe双掺杂对电输运性能有进一步改善,最高功率因子为2.667×10^3μW·(m·K2)^-1;热性能分析表明,Fe掺杂对晶格热导率影响较小,晶格热导率与晶粒尺寸有关,主要热输运机制为晶界散射,Co3.65Fe0.15Ni0.2Sb12的最小晶格热导率为2.8 W·(m·K)^-1。Co3.7Fe0.1Ni0.2Sb12在773 K获得最大热电优值0.50,显著高于传统方法制备的Ni/Fe单掺杂或者双掺杂样品。A series of single phase Ni/Fe double doped skutterudite compounds Co3.8-xFexNi0.2Sb12(x=0.05,0.10,0.15,0.20)were synthesized by 5 min microwave heating for the first time.The resulting ingots were pulverized and sintered by spark plasma sintering to fabricate bulk samples,and their phase composition,grain size,element distribution,thermoelectric transport properties were investigated.The XRD patterns show that all samples are consistent with single phase of CoSb3.The FE-SEM morphologies reveal that the size of Co3.8-xFexNi0.2Sb12(x=0.05,0.10,0.15,0.20)matrix grain is about 1~3μm,and the average size is about 1~2μm.The EDS elemental maps reveal uniform Co,Fe,Ni,and Sb distributions.The electrical transport properties are further improved by Ni/Fe double doping,with the highest power factor of 2.667×10^3μW·(m·K2)^-1.The influence of Fe doping on lattice thermal conductivity is not significant,but there is a relationship between lattice thermal conductivity and grain size,and boundary scattering is the dominant scattering mechanism.The lattice thermal conductivity of Co3.65Fe0.15Ni0.2Sb12 is 2.8 W·(m·K)^-1.The Co3.7Fe0.1Ni0.2Sb12 has the highest ZT of 0.50 at 773 K,which is obviously larger than that of Ni/Fe single or double doped samples produced via traditional techniques.

关 键 词：方钴矿 微波合成 掺杂 电性能 热电优值 

分 类 号：TB34[一般工业技术—材料科学与工程]