Abstract ABO 3 -type perovskite crystallites with symmetrical crystal structures do not show a tendency to grow in the shape of rods and plates, which are of great scientific interest due to their anisotropic physical properties. A topochemical transformation is one of the most convenient approaches for the preparation of such defined-shape perovskite particles, the functional properties of which can be additionally tailored by the formation of solid solutions. In this study a one-step topochemical conversion reaction from a Bi 4 Ti 3 O 12 template to A-site-substituted complex Ba 1-x Sr x TiO 3 perovskite microplates was investigated in order to understand the mechanism and to determine the compositional, structural and morphological correlations between the template and the final plate-like particles. Based on our finding that Sr incorporates in a 2.7-times larger amount than expected from the initial Ba/Sr ratio (0 1-x Sr x TiO 3 solid-solution composition could be prepared using this topochemical transformation. The tetragonal distortion of the Ba 1-x Sr x TiO 3 plates, expressed as the c/a ratio, was found to decrease linearly from 1.0092 (x = 0) to 1.0037 (x = 0.23), while the compositions with higher x were cubic (c/a=1). According to a piezo-response force microscope (PFM) examination, Ba 1-x Sr x TiO 3 plates with 0 ≤x ≤ 0.175 showed ferroelectric and piezoelectric characteristics. The temperature of the ferroelectric-to-paraelectric phase transition, as determined by differential scanning calorimetry (DSC), linearly decreased from 124 °C (x = 0) to 88 °C (x = 0.11). XRD examinations revealed a strong (001) preferential orientation for the plates (0 ≤ x ≤ 0.11) and the typical (001)/(100) peak splitting indicated the presence of c - and a -domains. The successful preparation and design of Ba 1-x Sr x TiO 3 plates increase the potential of this topochemical transformation for the preparation of plates with a variety of solid-solution compositions and controlled characteristics.

中文翻译：

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Ba1-xSrxTiO3 板：通过拓扑化学转化、压电和铁电特性合成

摘要 具有对称晶体结构的ABO 3 型钙钛矿微晶不表现出棒状和板状生长的趋势，由于其各向异性的物理性质而具有重要的科学意义。拓扑化学转化是制备这种形状明确的钙钛矿颗粒的最方便的方法之一，其功能特性可以通过形成固溶体来额外定制。在这项研究中，研究了从 Bi 4 Ti 3 O 12 模板到 A 位取代复合物 Ba 1-x Sr x TiO 3 钙钛矿微板的一步拓扑化学转化反应，以了解其机理并确定其组成，模板和最终板状颗粒之间的结构和形态相关性。XRD 检查显示板的强 (001) 优先取向 (0 ≤ x ≤ 0.11) 和典型的 (001)/(100) 峰分裂表明存在 c - 和 a - 域。Ba 1-x Sr x TiO 3 板的成功制备和设计增加了这种拓扑化学转变的潜力，用于制备具有各种固溶体成分和受控特性的板。