학술논문
에너지 재료 : 고에너지 볼 밀링이 Skutterudite계 CoSb3의 열전 및 전하 전송 특성에 미치는 영향
Regular Paper : Effect of High-Energy Ball Milling on Thermoelectric Transport Properties in CoSb3 Skutterudite
Regular Paper : Effect of High-Energy Ball Milling on Thermoelectric Transport Properties in CoSb3 Skutterudite
Document Type
Article
Author
남우현 / Woo Hyun Nam; 맹은지 / Eun Ji Meang; 임영수 / Young Soo Lim; 이순일 / Soonil Lee; 서원선 / Won Seon Seo; 이정용 / Jeong Yong Lee
Source
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) / Journal of the Korean Institute of Electrical and Electronic Material Engineers. Dec 31, 2015 28(12):852
Subject
Language
Korean
ISSN
1226-7945
Abstract
In this study, we investigate the effect of high-energy ball milling on thermoelectric transport properties in double-filled CoSb3 skutterudite (In0.2Yb0.1Co4Sb12). In0.2Yb0.1Co4Sb12 powders are milled using high-energy ball milling for different periods of time (0, 5, 10, and 20 min), and the milled powders are consolidated into bulk samples by spark plasma sintering. Microstructure analysis shows that the high-energy ball milled bulk samples are composed of nano- and micro-grains. Because the filling fractions are reduced in the bulk samples due to the kinetic energy of the high-energy ball milling, the carrier concentration of the bulk samples decreases with the ball milling time. Furthermore, the mobility of the bulk samples also decreases with the ball milling time due to enhanced grain boundary scattering of electrons. Reduction of electrical conductivity by ball milling has a decisive effect on thermoelectric transport in the bulk samples, power factor decreases with the ball milling time.