烧结条件对La、Mn掺杂BaTiO3基PTCR材料性能的影响  

Influence of sintering conditions on BaTiO3-based PTC ceramics doped with La and Mn

作　　者：丁士文[1] 贾光[1] 王利勇[1] 王静[1] 李兰芬[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《功能材料》2007年第A02期453-455,共3页Journal of Functional Materials

基　　金：河北省自然科学基金重点资助课题（299078）.

摘　　要：采用低温固态反应合成了La、Mn掺杂纳米钛酸钡基固溶体粉体，研究了各种烧结条件对其PTC材料性能的影响。实验表明，随着烧结温度的升高，材料的室温电阻先减后增，而升阻比基本呈先增后减的变化规律。随着保温时间的增长，材料的室温电阻也呈现先减后增的规律，且电阻温度系数逐渐增大。当烧结温度为1330℃，保温时间为30min时，制得了室温电阻率为72．97Ω·cm，升阻比和电阻温度系数分别为5．55×10^4和18.41％/℃的性质优良的PTC陶瓷材料。同时，对于各种变化规律给予了一定的理论解释。The BaTiO3-based PTC ceramic powder doped with La and Mn was synthesized by solid-state reaction at low temperature. It can be seen that the room-temperature resistance changes as the U-type curve with an increase of sintering temperature while the resistance jump is on the reverse in general. The room-temperature resistance changes as the U-type curve and the temperature coefficient of resistance a increases with an increase of soaking time. It is found that the Pgr is 72.97D.cm, resistivity jump is 5.55×10^4 and temperature coefficient of resistance α is 18.41%/℃ when the ceramics materials sintered at 1330℃ for 30rain. Moreover, the effect of sintering conditions has been discussed and explained in theory.

关 键 词：BATIO3 PTC特性 烧结温度 保温时间 

分 类 号：TM223[一般工业技术—材料科学与工程] TN373[电气工程—电工理论与新技术]