Unfolding grain size effects in barium titanate ferroelectric ceramics.
Unfolding grain size effects in barium titanate ferroelectric ceramics.
复制标题
钛酸钡铁电陶瓷中晶粒尺寸的影响
DOI：
10.1038/srep09953
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发表时间：
2015-05-07
影响因子：
4.6
通讯作者：
Yan H
中科院分区：
文献类型：
--
作者：
Tan Y;Zhang J;Wu Y;Wang C;Koval V;Shi B;Ye H;McKinnon R;Viola G;Yan H
晶粒尺寸对多晶铁电体物理性能的影响已经被广泛研究了几十年，然而，关于晶粒尺寸对压电和铁电性能的依赖性仍然存在重大争议。采用常规烧结法和放电等离子烧结法，分别采用微米级和纳米级粉体制备了不同晶粒尺寸的致密BaTiO 3陶瓷。结果表明，晶粒尺寸对介电常数的影响与烧结方法和所用的起始粉末几乎无关。在晶粒尺寸接近1 μm的陶瓷中观察到介电常数的峰值，并且可以归因于最大的畴壁密度和迁移率。 的压电系数d33和剩余极化Pr显示不同的晶粒尺寸的影响取决于起始粉末的粒度和烧结温度。这表明，除了畴壁密度，其他因素，如背场和点缺陷，影响畴壁的迁移率，可能是负责不同的晶粒尺寸依赖性中观察到的介电和压电/铁电性能。在点缺陷不是主要贡献者的情况下，压电常数d33和剩余极化Pr随着晶粒尺寸的增加而增加。
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 1 μm 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.
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影响因子：
56.9
作者：
Fong, DD;Stephenson, GB;Thompson, C
通讯作者：
Thompson, C
DOI：
10.1111/j.1151-2916.1957.tb12603.x
发表时间：
1957-01-01
影响因子：
3.9
作者：
DEVRIES, RC;BURKE, JE
通讯作者：
BURKE, JE
影响因子：
0.8
作者：
Ding Shihua;Song Tianxiu;Luo Guanghua
通讯作者：
Luo Guanghua
影响因子：
3.2
作者：
Damjanovic, D
通讯作者：
Damjanovic, D
DOI：
10.1111/j.1151-2916.1999.tb01840.x
发表时间：
1999-04-01
影响因子：
3.9
作者：
Haertling, GH
通讯作者：
Haertling, GH