作　　者： ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《电子元件与材料》 2005年第4期36-38,共3页

摘　　要： 根据超薄介质层对高介电常数和细晶结构介质陶瓷材料的需要,采用非均匀形核淀积方法实现Nb、Co、La的氧化物与BaTiO3(BT)水热粉体在纳米水平上的均匀混合。研究了该方法制备的Nb、Co、La掺杂BT陶瓷的相结构、显微结构以及介电性能。实验发现,La、Nb、Co的掺杂可获得致密细晶BT陶瓷,晶粒尺寸可控制在300nm范围内,室温相对介电常数达到3400,介温稳定性符合X7R要求。 For the need of thin layer of dielectric ceramics with small grain size and high dielectric constant, a heterogeneous nucleation processing technique was utilized to mix hydrotherrmally-synthesized-BaTiO3 (BT) powders with Nb-,Co- and La-oxides uniformly. XRD, microstructure and dielectric properties of Nb, Co and La-doped BT ceramics were studied. From experiments it was found that doping of La in A site and Nb-Co in B side of barium titanate leaded to the decrese of grain size to 300nm or less, dielectric constant at room temperature reaching to 3400 and temperature coefficient of capacitance meeting the specification of EIA-X7R.

关 键 词： 无机非金属材料 钛酸钡陶瓷 铌 钴 镧 掺杂 介电性能 微观结构

领　　域： [电子电信]