CBS玻璃和Mn^(2+)复合掺杂BaTiO_3陶瓷的电容量温度特性

Temperature-capacitance characteristics of CBS glass and Mn^(2+)co-doped BaTiO_3 ceramics

研究了硼硅酸钙(CBS)玻璃不掺杂/掺杂时Mn^(2+)浓度变化对钛酸钡陶瓷电容量温度特性的影响.结果表明,不掺CBS玻璃时Mn^(2+)浓度变化对BT陶瓷电容量温度特性没有明显的影响,此时BT陶瓷超过X8R特性许可范围;而掺CBS玻璃时Mn^(2+)浓度增大使电容量温度特性的高温峰持续增强,BT陶瓷容易满足X8R特性.掺CBS玻璃时Mn^(2+)可使CBS析晶.BT陶瓷的电容量高温变化率和微观应力分数成正比例关系变化.条状第二相Ca_4Mn_4Si_8O_(24)的产生改变了BT系统的内应力结构是钛酸钡陶瓷电容量温度特性产生规律变化的主要原因.

The effects of Mn^2＋ concentration on temperature-capacitance characteristics （TCC） of barium titanate without/with calcium borosilicate （CBS） glass doping were investigated. The results showed that without CBS glass doping, TEE of barium titanate had no regular change while Mn^2＋ concentration changed and exceeded the X8R specification unfortunately. With CBS glass doping, the high temperature peak of TEE exhibited a continuous enhancement when Mn^2＋ concentration increased and X8R specification was satisfied gently. The high temperature variation rate of capacitance for BT ceramic was somewhat proportional to the mean micro-strain. The formation of the strip-shaped secondary phase of Ca4Mn4Si8O24, which altered the internal stress system of BT ceramics, is presumed to be the factor that improved the TEE of barium tianate.