摘要
本文采用自蔓延法,以去离子水为溶剂,柠檬酸为螯合剂,硝酸盐和氧化物为原料成功的制备了NaxSm0.3Ca2.7-xCo4O9+δ(x=0,0.1,0.15,0.2)化合物粉体,表征了粉体的粒度分布,并对Na0.2Sm0.3Ca2.5Co4O9+δ粉体进行了粉末压形实验,实验结果表明:NaxSm0.3Ca2.7-xCo4O9+δ(x=0.2)陶瓷粉体的压形规律符合黄培云压制方程,压制模量M为0.095223 MPa,而非线性指数m为4.000317。探索了Na+和Sm3+共掺杂对其块体在473～973 K温度区间内的热电性能影响,其中Na0.2Sm0.3Ca2.5Co4O9+δ在973 K时的电阻率和Seebeck系数分别为6.044 mΩ.cm和175.4μVK-1,热电转换功率因子达到5.09×10-6W m-1K-2。
NaxSm0.3Ca2.7-xCo4O9＋δ（x=0,0.1,0.15,0.2） polycrystalline samples had been prepared by a simple self-ignition route using citric acid as chelating agent,nitrate and oxide as oxidant and de-ionized water as dissolvent.The synthesized powders were tested by pressing shape further.The test results revealed that the compaction module and the nonlinear exponent of powder compaction were about 0.095223 MPa and 4.000317,which were calculated from Huang Peiyun′s compacting equation respectively.The electrical resistivity and Seebeck coefficients of NaxSm0.3Ca2.7-xCo4O9＋δ were carefully studied from 473 K to 973 K.The results showed that the electrical resistivity（ρ）,Seebeck coefficient（S） and power factor（P） of Na0.2Sm0.3Ca2.5Co4O9＋δ sample were 6.044 mΩ·cm,175.4 μVK-1 and 5.09×10-6 Wm-1K-2 at 973 K,respectively.
出处
《粉末冶金工业》
CAS
北大核心
2010年第6期36-40,共5页
Powder Metallurgy Industry
基金
国家自然科学基金资助项目(200771032)
关键词
自蔓延法
热电性能
功率因子
self-ignition
thermoelectric properties
power factor
