Aggregate linear properties of ferroelectric ceramics and polycrystalline thin films: Calculation by the method of effective piezoelectric medium
Aggregate linear properties of ferroelectric ceramics and polycrystalline thin films: Calculation by the method of effective piezoelectric medium
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铁电陶瓷和多晶薄膜的聚合线性特性：有效压电介质法计算
DOI：
10.1063/1.368218
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发表时间：
1998
影响因子：
3.2
通讯作者：
R. Waser
中科院分区：
文献类型：
--
作者：
N. Pertsev;A. G. Zembilgotov;R. Waser
本文采用一种改进的有效介质法，从单晶数据出发，计算了多晶铁电材料的有效介电常数、压电常数和弹性常数，该方法充分考虑了晶粒间的压电相互作用。对于BaTiO_3和PbTiO_3块体极化陶瓷，材料常数对反射极化的依赖关系。介电常数和弹性常数的计算也为非极化的c-和a-织构铁电薄膜沉积在立方或非晶衬底上。研究发现，BaTiO_3和PbTiO_3多晶薄膜的介电性能与晶体织构类型密切相关。二维夹紧基板上的极化膜的介电和压电响应的影响进行了定量描述，并示出是特别重要的BaTiO 3膜的压电电荷系数。
The effective dielectric, piezoelectric, and elastic constants of polycrystalline ferroelectric materials are calculated from single-crystal data by an advanced method of effective medium, which takes into account the piezoelectric interactions between grains in full measure. For bulk BaTiO3 and PbTiO3 polarized ceramics, the dependences of material constants on the remanent polarization are reported. Dielectric and elastic constants are computed also for unpolarized c- and a-textured ferroelectric thin films deposited on cubic or amorphous substrates. It is found that the dielectric properties of BaTiO3 and PbTiO3 polycrystalline thin films strongly depend on the type of crystal texture. The influence of two-dimensional clamping by the substrate on the dielectric and piezoelectric responses of polarized films is described quantitatively and shown to be especially important for the piezoelectric charge coefficient of BaTiO3 films.