Reactive template grain growth of BiFeO3-PbTiO3 by using Bi4Ti3O12, PbBi4Ti4O15 and SrTiO3 as templates
Reactive template grain growth of BiFeO3-PbTiO3 by using Bi4Ti3O12, PbBi4Ti4O15 and SrTiO3 as templates
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以 Bi4Ti3O12、PbBi4Ti4O15 和 SrTiO3 为模板的 BiFeO3-PbTiO3 反应模板晶粒生长
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发表时间：
2011
期刊：
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通讯作者：
A. Bell
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作者：
M. Palizdar;T. Comyn;A. Kleppe;A. J. Jephcoat;A. Bell
铋铁氧体在室温下表现出多铁性。它是一种具有菱形畸变晶格的钙钛矿，铁电居里点为836℃。钛酸铅是一种铁电居里点为490℃的四角形钙钛矿。铋铁氧体和钛酸铅之间的固溶体xBiFeO3-(1−x)PbTiO3 （BFPT）在x=0.7时具有介于菱形和四边形之间的相变相边界（MPB）。为了确定正确取向的BFPT能否同时提供巨大的压电性能和显著的磁电耦合，研究场驱动的菱形-四边形相变对MPB的影响是很有意义的。在这里，我们使用反应模板晶粒生长（RTGG）技术制备了晶体织构的BFPT陶瓷。模板晶粒生长（TGG）利用定向模板作为种子来改善和增加多晶基体内的首选定向生长。本例中，在制备BFPT的过程中，分别使用Bi4Ti3O12、PbBi4Ti4O15和SrTiO3作为模板。使用x射线衍射，使用常规和同步加速器源以及扫描电子显微镜对样品进行了表征。结果表明，PbBi4Ti4O15是最有效的模板，其织构水平ITEX = 1.80，且沿铸态方向有四边形（001）反射。实验室XRD的穿透深度有限，不足以表征这些材料的织构。
Bismuth ferrite exhibits multiferroic properties at room temperature. It is a perovskite with a rhombohedrally distorted lattice and has a ferroelectric Curie point of 836 °C. Lead titanate is a tetragonal perovskite with a ferroelectric Curie point of 490°C. The solid solution between bismuth ferrite and lead titanate xBiFeO3-(1−x)PbTiO3, or BFPT, possesses a morphotropic phase boundary (MPB) between the rhombohedral and tetragonal forms at x=0.7. It is of interest to investigate the influence of field-driven rhombohedral-tetragonal phase transitions across the MPB, to determine whether correctly oriented BFPT can provide both giant piezoelectric properties and significant magnetoelectric coupling. Here, we used the reactive template grain growth (RTGG) technique to prepare crystallographically textured BFPT ceramics. Template grain growth (TGG) utilizes an oriented template as a seed to improve and increase preferred directional growth within a polycrystalline matrix. In this example, Bi4Ti3O12, PbBi4Ti4O15 and SrTiO3 have been used separately as templates during the process of BFPT preparation. The samples were characterized using X-ray diffraction, using both conventional and synchrotron sources and scanning electron microscopy. The results show that PbBi4Ti4O15 is the most effective template providing a level of texture ITEX = 1.80, with the tetragonal (001) reflection orientated along the cast direction. The limited penetration depth of laboratory XRD renders it insufficient to characterise the texture of these materials.