Sm_(1-x)Sr_xFe_(0.7)Cr_(0.3)O_(3-δ)陶瓷的导电性能与热膨胀性能  

Electrical Conductivity and Thermal Expansion Properties of Sm_(1-x)Sr_xFe_(0.7)Cr_(0.3)O_(3-δ) Ceramics

作　　者：杨永青[1] 肖静[1] 刘会栋 黄端平[1] 徐庆[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《现代技术陶瓷》2016年第1期41-46,共6页Advanced Ceramics

基　　金：国家自然科学基金(51572204);武汉市科技局国际合作项目(2014030709020315)

摘　　要：本文探讨了采用离子半径较小的Sm^(3+)代替La_(0.3)Sr_(0.7)Fe_(1-x)Cr_xO_(3-δ)中的La^(3+)以降低这类阴极材料热膨胀系数的可行性。采用甘氨酸-硝酸盐法合成了Sm_(1-x)Sr_xFe_(0.7)Cr_(0.3)O_(3-δ)(x=0.5~0.7)粉体,在1350°C下烧结得到陶瓷样品。测试结果表明,陶瓷样品的相对密度均达到95%以上;在700°C下,陶瓷样品的电导率为~44 S×cm^(-1);在40°C^1000°C温度范围内,陶瓷样品的平均热膨胀系数为12.8×10^(-6)K^(-1)~14.1×10^(-6)K^(-1)。The feasibility of replacing La^（3＋） in La_0.3Sr_（0.7）Fe_（1-x）Cr_xO（3-δ） by Sm^（3＋）to decrease the thermal expansion coefficients was studied. Sm1-xSrxFe0.7Cr0.3O3-δ（x = 0.5 ~ 0.7） powders were synthesized by using a glycine-nitrate process and the ceramic specimens were prepared by sintering at 1350°C. The results indicated that the ceramic specimens attained over 95% of their theoretical densities. The electrical conductivities of the specimens at 700°C were around 44 S×cm^（-1）. The thermal expansion coefficients of the specimens averaged over the temperature range of 40°C ~ 1000°C were in the range of 12.8 × 10^（-6）K^（-1） ~ 14.1 × 10^（-6）K^（-1）.

关 键 词：甘氨酸-硝酸盐法 阴极材料 电导率 热膨胀系数 

分 类 号：TB34[一般工业技术—材料科学与工程]