纳米BaTiO3基PTCR瓷粉的制备及其性能

Preparation of nano BaTiO3-based PTC ceramics powder and its electrical properties

    摘要
  • 摘要: 本文以TiC l4为原料,将其水解生成的H2TiO3与化学计量比的Ba(OH)2·8H2O及Ca,Sr,Y,Mn的醋酸盐在室温下混合研磨后,于100℃烘干,再经800℃热处理,得到了一系列掺杂Ba0.85-xYxSr0.07Ca0.08MnyTi1-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50 nm。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1mol%和0.04mol%时,得到了室温电阻13Ω左右,升阻比达到106,电阻温度系数α为21.9%/℃的性质优良的PTC陶瓷材料。

     

    Abstract: The H2TiO3 through hydrolysis of TiCl4 and calculated amount of Ba（OH）2·8H2O Sr（Ac）2·1/2H2O,Mn（Ac）2·4H2O and Y（Ac）3 were mixed and ground in mortar for 1h at room temperature,then dried at 100℃.The Ba0.85-xYx Sr0.07Ca0.08 MnyTi1yO3 powder was obtained by calcining the mixture at 800℃ for 1h.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,substantially spherical particles with an average partical size of 50 nm in diameter.The PTC effect of the materials were studied by using prepared ceramics.It was found that the resistance is near 13Ω at room temperature,ratio of lg（Rmax/Rmin）is 6 and temperature coefficient of resistance α is 21.9% / ℃ when the content of Y and Mn are 1 mol% and 0.04 mol% respectively.

     

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