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超微LaMO3(M=Fe,Cr,Mn,Co)的导电性与粒度的关系

Relationship Between Electrical Conductivity and Particle Size for LaMO3(M=Fe,Cr,Mn,Co)Ultrafine Powders

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【作者】 董相廷郭奕柱洪广言任玉芳

【Author】 Dong Xiangting;Guo Yizhu;Hong Guangyan;Ren Yufang (Changchun Institute of Applied Chemistry,Academia Sinica)

【机构】 中国科学院长春应用化学研究所

【摘要】 用Sol-Gel法合成了LaMO_3(M=Fe,Cr,Mn,Co)超微粉末.X射线衍射分析表明,不同焙烧温度下所合成的化合物均为单相.SEM分析表明,粒子呈球形,室温电阻率测量表明,电阻率随粒度的变化呈两种类型:LaFeO_3,LaCrO_3随粒度的增大,电阻率增加;而LaMnO_3,LaCoO_3随粒度的增大,电阻率减小.

【Abstract】 LaMO3(M = Fe,Cr,Mn,Co)ultrafine powders were prepared with sol-gel method.XRD showed that thecompounds prepared are single phase. SEM indicated that the particles are spherical in shape. It was foundthat the change of the resistivities with particle sizes has two types at room temperature. For LaMO3(M=Fe,Cr),the resistivities increase with the increase of particle sizes;while for LaMO3(M=Mn,Co),the resistivi-ties decrease with the increase of particle sizes.

【基金】 中国科学院稀土化学与物理开放实验室资助项目
  • 【文献出处】 科技通报 ,BULLETIN OF SCIENCE AND TECHNOLOGY , 编辑部邮箱 ,1994年05期
  • 【分类号】O482.4
  • 【被引频次】9
  • 【下载频次】44
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