Co在ZnO和SrTiO_3压敏陶瓷中的不同作用机理  

Mechanism of Different Effect of Co on Properties of ZnO and SrTiO_3 Varistor Ceramics

作　　者：孙树峰[1] 曹全喜[1] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《压电与声光》2006年第2期167-169,172,共4页Piezoelectrics & Acoustooptics

基　　金：陕西省自然科学基金资助项目(2002F10);西安交通大学电力设备电气绝缘国家重点实验室开放基金资助项目

摘　　要：从ZnO和SrTiO3的不同晶体结构和烧结工艺出发,论述了CoO在这两种晶体中所处的位置和不同的作用机理。实验结果证实同一种原子在不同的材料和烧结工艺中起着不同的作用。通过分析晶体点缺陷和烧结气氛的关系解释了实验结果:在氧化气氛中,CoO的主要缺陷是金属空位,增加晶界受主态密度;在还原气氛中,CoO的主要缺陷是氧空位,减少受主态密度。According to the crystal structures and the different sintering process of ZnO and SrTiO3, the positions of Co in the ceramic materials and mechanism of different effect of Co on properties of ZnO and SrTiO3 varistor ceramics are discussed. It is shown as experimental result that the same atoms could have different roles in different crystal structures and in different sintering process. The experimental result is explained by analyzing the relation between crystal point defects and sintering atmosphere： In reductive atmosphere the main defects in CoO is metal vacancy which increase acceptor state density and in oxidizeing atmosphere the main defects in CoO is oxygen vacancy which decrease acceptor state density.

关 键 词：压敏陶瓷 晶体结构 钴 烧结气氛 

分 类 号：TM283[一般工业技术—材料科学与工程]