硅酸盐学报2009，Vol.37Issue(3)：354-358,5.
钴掺杂对钛酸钡陶瓷晶体结构与电性能的影响
INFLUENCE OF COBALT DOPING ON STRUCTURE AND ELECTRICAL PROPERTIES OF BARIUM TITANATE CERAMICS
摘要
Abstract
BaTi1-xCoxO3 (x is the mole fraction of Co, x=0.01, 0.03, 0.05, 0.1, 0.2, 0.3, and 0.4) powders were prepared by a wet chemical process, and the influence of Co on the crystal structure and electrical properties were investigated. With the increase of Co concentration, the phase structure changes from tetragonal phase to tetragonal/hexagonal composite, and the ceramics are composed of pure hexagonal phase when x=0.2. The ceramics have a cubic phase besides the hexagonal one when x>0.2. The room-temperature resistance decreases and the temperature dependence of resistance changes from a positive temperature coefficient (PTC) effect to a negative temperature coefficient (NTC) effect when the Co concentration increased. The B constants for x=0.2, 0.3 and 0.4 are 3 270, 3 234 K and 3 037 K, respectively. The NTC behavior of ceramics can be understood by using the polaron hopping model.关键词
钴掺杂钛酸钡陶瓷/晶体结构/电性能/负温度系数/导电机理Key words
cobalt-doped barium titanate ceramic/crystal structure/electrical property/negative temperature coefficient/conductivity mechanism分类
通用工业技术引用本文复制引用
汪健,王申存,张鸿,李志成..钴掺杂对钛酸钡陶瓷晶体结构与电性能的影响[J].硅酸盐学报,2009,37(3):354-358,5.基金项目
教育部留学回国人员科研启动基金(2006331,20071108)及高校博士点专项科研基金(20070533119)资助项目. （2006331,20071108）
