Abstract

Effects of M-type barium hexaferrite (BH) on phase, microstructure, mechanical and electrical properties of barium titanate doped with Zr or MBT-xBH ceramics were systematically investigated. All ceramics presented pure perovskite structure with orthorhombic phase. Average grain size and porosity decreased while hardness increased with increasing BH and showed the highest value of 6.01 GPa for the 1.0 mol% sample. The mechanical properties improvement was related with the change in microstructure and porosity. The BH doping enhanced room dielectric constant by 266% with reduction of dielectric loss value (@1 kHz). Furthermore, grain size was found to affect with the change in strain behavior.

摘要

系统地研究了M型六方铁酸钡（BH）对掺Zr或MBT-xBH陶瓷的钛酸钡的相，组织，力学性能和电性能的影响。所有陶瓷均呈现具有斜方晶相的纯钙钛矿结构。随着BH的增加，平均晶粒度和孔隙率降低，硬度增加，并且1.0摩尔％的样品显示出6.01 GPa的最大值。力学性能的提高与组织和孔隙率的变化有关。BH掺杂通过降低介电损耗值（@ 1 kHz）将房间介电常数提高了266％。此外，发现晶粒尺寸会影响应变行为的变化。