摘要
在制备Pr-Mn共掺BaTiO3系列陶瓷(x(Mn)为0.006;x(Pr)为0,0.001,0.002,0.003,0.004,0.006)的基础上,对其在气态下扩渗Pr。经Pr扩渗后,陶瓷的室温电阻率降低为0.21Ω.m。变温电阻率的测试结果表明,陶瓷呈明显的正温度系数(PTC)效应。通过X-射线衍射(XRD)测试,发现Pr-Mn共掺并没有改变物相结构,Pr气相扩渗后,有新化合物PrO2和BaPr2Ti4O12生成。扫描电镜(SEM)测试结果表明,Pr气相扩渗有细化晶粒,增大晶界比例的作用,有利于材料的PTC效应。
After the preparation of a sieries of BaTiO3 ceramics doped by Pr and Mn（the fixed mole fraction of Mn is 0. 006 ;the mole fractions of Pr are 0,0. 001,0. 002,0. 003,0. 004,and 0. 006）, the gas penertration of Pr into the ceramics happens. The lowest room temperature resistivity is 0. 21 Ω· m. When measuring the resistivity at changing temperture,the effect of PTC appears obviously. The XRD measruement of ceramics which has the lowest room temperatue resistivity shows that the doping of rare earth does not change the frame of the ceramics,and that the penertration makes the generating of the new chmeical compound PrO2 and BaPr2Ti4 O12. The results of SEM show that the gas penertration makes the grain of the ceramics smaller and the proportion of grain boundary much bigger, which is good to the PTC effect of material.
出处
《压电与声光》
CSCD
北大核心
2006年第5期569-571,共3页
Piezoelectrics & Acoustooptics
基金
黑龙江省重点攻关基金资助项目(GB02A301)
