液相掺杂PTC瓷粉的制备及其电性能研究

Electical Property and Preparation of PTC Ceramics Synthesized by Liquid Mixes

以TiCl4为钛源,通过低温固态反应合成了一系列掺杂Ba0.93-xYxSr0.07MnyTi1-yO3纳米固溶体粉末。经XRD物相分析证明,产品为立方晶系的完全互溶取代固溶体。TEM电镜形貌分析,粒子分布较均匀,基本呈规则球形,粒径大约70nm。通过制陶实验,研究了材料的PTC效应,当施主Y和受主Mn的掺杂量分别为1%和0.04%(摩尔分数)时,得到了室温电阻37.09Ω左右,升阻比达到2.957×105,电阻温度系数α为23.36%的性质优良的PTC陶瓷材料。

A series of nano- Ba0.93-xYxSr0.07MnyTi1-yO3 solid solutions were synthesized by solid-state reaction at low temperature. XRD pattern demonstrated that the compounds were mutually miscible in the solid solutions. The TEM photograph showed that the compounds had a shape of uniform, sub- stantially spherical particles with an average partical size of 70nm in diameter. The PTC effect of the materials were studied by preparing ceramics. It was found that the resistance is near 37. 0912 at room temprature, ratio of lg （Rmax/Rmax）is 2. 957 × 10^5 and temperature coefficient of resistance α is 23.36%/℃ when the content of Y and Mn are 1% and 0.04% （mole fraction） respectively.