La_(0.8)Ca_(0.2)CrO_3体系复合氧化物的甘氨酸-硝酸盐法合成与导电性能  

Electrical Conducting Properties of La_(0.8)Ca_(0.2)CrO_3 Perovskite-type Complex Oxides Prepared by a Glycine-Nitrate-Process Method

作　　者：郭文锋[1] 徐庆[1] 陈文[1] 黄端平[1] 王皓[2] 袁润章[2] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《稀土》2007年第1期30-33,共4页Chinese Rare Earths

基　　金：国家教育部新世纪优秀人才支持计划(NECT-04-0724);国家自然科学基金项目(50572079)

摘　　要：采用甘氨酸-硝酸盐法合成La0.8Ca0.2CrO3复合氧化物粉料,对合成产物的晶体结构和显微形貌进行表征,研究烧成温度对La0.8Ca0.2CrO3相对密度和电导率的影响。实验结果表明,烧成温度为1400℃时样品即达较高的相对密度(92.6%),测试温度为800℃时样品的电导率为31.1S.cm-1。与常规固相法相比,GNP法合成产物的纯度高、颗粒细(100nm^200nm),有良好的烧结活性,能够有效地降低材料的烧成温度和提高材料的电性能。Perovskite-- type composite oxides of La0.8Ca0.2CrO3 were synthesized by a glycine-- nitrate -- process method （GNP）. The crystalline structure and morphology of synthesized powders were characterized by XRD and SEM. The influences of sintering temperature on the relative density and electrical conducting properties were studied. It was found that the sample sintered at 1400℃ attains a high relative density of 92.6%, showing an electrical conductivity of 31.1 S ·cm^-1 at 800℃. Compared with La0.8Ca0.2CrO3 synthesized by a conventional solid state reaction method,one synthesized by the GNP method exhibits fine morphology （100nm～200nm） and superior sintering activity, effectively lowing the sintering temperature and enhancing electrical conducting properties of the material.

关 键 词：La0.8Ca0.2CrO3 甘氨酸-硝酸盐法 相对密度 电导率 稀土 

分 类 号：TQ174[化学工程—陶瓷工业] O614.33[化学工程—硅酸盐工业]