Annealing Time Dependence on the Phase Equilibria and Thermoelectric Property of Type-I Ba8Cu6Ag2Si38 Clathrate
Poly-crystalline Ba8Cu6Ag2Si38 clathrates were synthesized by the arc-melting method and a subsequent annealing treatment.The main phase of all the samples was type-I clathrate.However,there were some precipitates which rich in Cu,Ag or Si in the grain boundary of the as-synthesized sample and the precipitates gradually reduced with the increase of annealing time.The transition metal content in the clathrate increased with the annealing time because of the diffusion of the Cu and Ag atoms from precipitates phase into clathrates phase.The as-synthesized sample was n-type material.For the 576 hours annealed sample,the carrier type changed from n-type to p-type because of the increase of Cu and Ag content in the clathrate.
clathrate silicon Cu and Ag substitution annealing p-type materials Seebeck coefficient
BIN Liu MAKOTO Saisho YUYA Nagatomo TAKUYA Oka TOSHIKO Osada HIDESHI Miura OSAMU Furukimi SHINJI Munetoh
Department of Materials Science and Engineering, Kyushu University,744Motooka, Nishi-ku,Fukuoka 819- Department of Mechanical Engineering, Kyushu University,744 Motooka, Nishi-ku, Fukuoka 819-0395, Jap
国际会议
石家庄
英文
59-62
2012-10-26（万方平台首次上网日期，不代表论文的发表时间）