Influence of sintering temperature on the thermoelectric properties of Ba_8Ga_(16)Si_(30) clathrate treated by spark plasma sintering  

作　　者：Li-hua Liu Feng Li Ning Chen Hong-mei Qiu Guo-hui Cao Yang Li 

机构地区：[1]School of Mathematics and Physics,University of Science and Technology Beijing [2]School of Materials Science and Engineering,University of Science and Technology Beijing [3]Department of Engineering Science and Materials,University of Puerto Rico at Mayaguez

出　　处：《International Journal of Minerals,Metallurgy and Materials》2015年第1期78-85,共8页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51072023);the National Science Foundation of US(No.DMR-0821284);the National Aeronautics and Space Administration of US(Nos.NNX10AM80H and NNX07AO30A)

摘　　要：A series of Ba8Ga16Si30 clathrate samples were prepared by arc melting, ball milling, acid washing, and spark plasma sintering （SPS）. X-ray diffraction analysis revealed that the lattice of the Ba8Ga16Si30 samples expanded as the SPS temperature was increased from 400 to 750℃. Lattice contraction recurred when the SPS temperature was further increased in the range of 750-1000℃. This phenomenon can be explained by the variation of Ga content in the lattice. The thermoelectric figure of the merit ZT value of clathrates increased with the increase in SPS temperature and reached a maximum when the sample was subjected to SPS at 800℃. A further increase in SPS temperature did not contribute to the improvement of ZT. The variation of the lattice parameter a vs. SPS temperature T was similar to the variation ob-served in the ZT-T curve.A series of Ba8Ga16Si30 clathrate samples were prepared by arc melting, ball milling, acid washing, and spark plasma sintering （SPS）. X-ray diffraction analysis revealed that the lattice of the Ba8Ga16Si30 samples expanded as the SPS temperature was increased from 400 to 750℃. Lattice contraction recurred when the SPS temperature was further increased in the range of 750-1000℃. This phenomenon can be explained by the variation of Ga content in the lattice. The thermoelectric figure of the merit ZT value of clathrates increased with the increase in SPS temperature and reached a maximum when the sample was subjected to SPS at 800℃. A further increase in SPS temperature did not contribute to the improvement of ZT. The variation of the lattice parameter a vs. SPS temperature T was similar to the variation ob-served in the ZT-T curve.

关 键 词：clathrate compounds THERMOELECTRICITY sintering temperature spark plasma sintering lattice constants 

分 类 号：TQ110.1[化学工程—无机化工]