氧化锌压敏陶瓷中氧化锌晶粒极性生长现象的研究

Polar Growth Phenomenon in ZnO Varistor

发现了ZnO压敏陶瓷中的锥状或柱状“突起物”现象.通过能谱发现“突起物”的物质构成是ZnO,而且是ZnO晶粒生长形成的实体,并非气体在ZnO中形成的气泡.进一步论证了这种现象是ZnO极性生长造成的,并从内因和外因两个方面进行了分析.内因是ZnO的极性晶格结构和结晶形态,外因是ZnO压敏陶瓷中Bi2O3液相提供了极性生长得以显现的物化环境,并且通过单独添加Bi2O3的97mol%ZnO+3mol%Bi2O3配方和100mol%纯ZnO配方制备样品进行对比实验,验证了Bi2O3的作用.

The protuberance phenomenon in shape of conic or cylinder was discovered for the first time. It was found by EDS that the protuberance is entity formed by ZnO, not the air bubble. And it was proved that the polar growth of ZnO leads to the protuberance phenomenon. The detailed reasons were probed from internal and external courses. The internal course is the polar structure and morphology of ZnO crystal. The external course is the physical and chemical environment made by Bi2O3 liquid phase, and this conclusion was proved by the comparisons of the samples which fabricated by 97mol%ZnO＋3mol%Bi2O3 （in mole） compound and 100mol% （in mole） ZnO compound.