首页> 外文OA文献 >Unfolding grain size effects in barium titanate ferroelectric ceramics
【2h】

Unfolding grain size effects in barium titanate ferroelectric ceramics

机译:钛酸钡铁电陶瓷的晶粒尺寸效应

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Grain size effects on the physical properties of polycrystalline ferroelectrics have been extensively studied for decades; however there are still major controversies regarding the dependence of the piezoelectric and ferroelectric properties on the grain size. Dense BaTiO3 ceramics with different grain sizes were fabricated by either conventional sintering or spark plasma sintering using micro- and nano-sized powders. The results show that the grain size effect on the dielectric permittivity is nearly independent of the sintering method and starting powder used. A peak in the permittivity is observed in all the ceramics with a grain size near 1μm and can be attributed to a maximum domain wall density and mobility. The piezoelectric coefficient d33 and remnant polarization Pr show diverse grain size effects depending on the particle size of the starting powder and sintering temperature. This suggests that besides domain wall density, other factors such as back fields and point defects, which influence the domain wall mobility, could be responsible for the different grain size dependence observed in the dielectric and piezoelectric/ferroelectric properties. In cases where point defects are not the dominant contributor, the piezoelectric constant d33 and the remnant polarization Pr increase with increasing grain size.
机译:数十年来,晶粒尺寸对多晶铁电体物理性能的影响已得到广泛研究。然而,关于压电和铁电性能对晶粒尺寸的依赖性仍然存在重大争议。使用微米级和纳米级粉末,通过常规烧结或火花等离子烧结制造了具有不同晶粒尺寸的致密BaTiO3陶瓷。结果表明,晶粒尺寸对介电常数的影响几乎与烧结方法和所用起始粉末无关。在所有晶粒尺寸接近1μm的陶瓷中均观察到介电常数的峰值,这可归因于最大畴壁密度和迁移率。取决于起始粉末的粒径和烧结温度,压电系数d33和残余极化Pr表现出不同的粒径效应。这表明,除了畴壁密度以外,其他影响畴壁迁移率的因素(例如后场和点缺陷)也可能是介电和压电/铁电特性中观察到的不同晶粒尺寸依赖性的原因。在点缺陷不是主要因素的情况下,压电常数d33和残余极化Pr随晶粒尺寸的增加而增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号