Effect of degree of crystallographic texture on ferro- and piezoelectric properties of Ba0.85Ca0.15TiO3 piezoceramics
Effect of degree of crystallographic texture on ferro- and piezoelectric properties of Ba0.85Ca0.15TiO3 piezoceramics
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DOI：
10.1111/jace.14749
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发表时间：
2017-05
影响因子：
3.9
通讯作者：
J. Schultheiß;O. Clemens;S. Zhukov;H. Seggern;W. Sakamoto;J. Koruza
中科院分区：
文献类型：
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作者：
J. Schultheiß;O. Clemens;S. Zhukov;H. Seggern;W. Sakamoto;J. Koruza
晶体织构是一种很有前途的方法，以减少随机取向的多晶压电体和完美取向的单晶之间的性能差距。在这里，晶体织构的程度上的机电性能和它们的温度稳定性的无铅钙钛矿型铁电体Ba 0.85Ca 0.15TiO 3的影响进行了研究。采用反应模板晶粒生长法制备了具有宽范围（100）、（001）织构（Lotgering因子26%-83%）的样品。使用X射线衍射和扫描电子显微镜进行了晶体学和微观结构分析，而温度依赖性的机电性能，其特征在于介电，压电，极化和应变测量。结果表明，总双极应变和矫顽场线性依赖于洛特金因子。总的双极应变增加了80%，而矫顽场下降了18%，由于晶体织构。同样，样品的机电性能的温度稳定性被发现是依赖于纹理的程度。具有高织构度的样品表现出117°C的居里温度，与具有低织构度的对应物相比高21%。这与化学不均匀性和改良的内部机械应力状态有关。
Crystallographic texturing is a promising approach to reduce the performance gap between randomly oriented polycrystalline piezoelectrics and perfectly oriented single crystals. Here, the influence of the degree of crystallographic texture on the electromechanical properties and their temperature stability of the lead-free perovskite ferroelectric Ba0.85Ca0.15TiO3 is investigated. Samples with a broad range of (100),(001) crystallographic texture (Lotgering factor 26%-83%) were prepared by the reactive templated grain growth method. Crystallographic and microstructural analysis have been carried out using X-ray diffraction and scanning electron microscopy, while the temperature-dependent electromechanical properties were characterized by dielectric, piezoelectric, polarization, and strain measurements. It was revealed that the total bipolar strain and the coercive field are linearly dependent on the Lotgering factor. The total bipolar strain increased by 80%, whereas the coercive field decreased by 18% due to crystallographic texturing. Likewise, the temperature stability of the electromechanical properties of the samples was found to be dependent on the degree of texture. A sample with a high degree of texture exhibited a Curie temperature of 117°C, which is 21% higher compared to a counterpart with a low degree of texture. This was related to chemical inhomogeneity and a modified internal mechanical stress state.