摘要
以金属硝酸盐为起始原料，采用溶胶．凝胶法制备了AgxCa3-xCO4O9（X=0.1-0.6）复合氧化物粉末，SPS烧结了其块体，研究了Ag^＋掺杂量对系统物相组成及电性能的影响。结果表明，在本实验范围内随着Ag^＋掺杂量的增加，出现了单质Ag和CO3O4，与此伴随的是块体各温度点电阻率和Seebeck系数的降低．当X=0.6时，100℃时的电阻率达到最低值1.7×10^-5Ω．m，且块体导电特性由半导体转变为金属。当X=0．3，SPS烧结时间2h时功率因子达7.612×10^-4m.K^-2。
Polycrystal AgxCa3-xCO4O9 powder and bulks were prepared using sol-gel and SPS method with nitrates as starting materials and the effects of Ag^＋ substitutation of Ca^2＋ on phase structure and electrical performances of bulks were investigated. The results reveals that new phasees of Ag and Co3O4 emerge with increasing substitution of Ag^＋, the Seebeck coefficient and electrical resistivity of bulks decrease accordingly.The resistivity of x=0.6 sample reaches 1.72×10^-5ohm.m at 100℃ and the conductivity exhibits characteristics of metal conduction. The power factor of x=0.3 sample calcined for 2h reaches 7.612×10^-4m.K^-2 at 700℃.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A04期1374-1376,共3页
Journal of Functional Materials
基金
基金项目：国家自然科学基金资助项目（50271001）
校青年基金资助项目（97009011200601）
关键词
热电氧化物
SPS烧结
掺杂
热电性能
thermoelectric oxide
spark plasma sintering
substitution
thermoelectricai performance
