Synthesis of platelet SrTiO/sub 3/ by epitaxial growth on Sr/sub 3/Ti/sub 2/O/sub 7/ core particles

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195914

M. E. Ebrahimi, M. Allahverdi, A. Safari

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Abstract

A method for synthesis of platelet seeds by epitaxial growth of SrTiO/sub 3/ on Sr/sub 3/Ti/sub 2/O/sub 7/ core particles is reported. The aim of this study was to control the morphology, particle size, phase and chemical purity of SrTiO/sub 3/ seeds. Strontium titanate seeds will be used as templates in layered manufacturing to grow large lead magnesium niobate-lead titanate (PMN-PT) crystals within a polycrystalline matrix. Anisometric single crystal particles of Sr/sub 3/Ti/sub 2/O/sub 7/ were synthesized in molten KCl salt at 1200-1300/spl deg/C. Plate-like morphology with a high aspect ratio of 7-10 was obtained. The XRD and SEM revealed a well-developed single crystal structure with rectangular faces. The plate-like Sr/sub 3/Ti/sub 2/O/sub 7/ particles were then reacted with TiO/sub 2/ in a second molten salt synthesis to prepare SrTiO/sub 3/. Platelet <001> SrTiO/sub 3/ particles with rectangular faces having an edge length of 10-40 /spl mu/m and a thickness of 1-4 /spl mu/m were obtained. The effects of processing steps on the morphology, particles size, and composition of the platelets are presented. The high aspect ratio SrTiO/sub 3/ platelets are suitable template candidates to achieve textured PMN-PT ceramics.

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Sr/sub 3/Ti/sub 2/O/sub 7/核心颗粒外延生长制备血小板SrTiO/sub 3/

报道了一种在Sr/sub 3/Ti/sub 2/O/sub 7/核粒子上外延生长SrTiO/sub 3/的方法。本研究的目的是控制SrTiO/ sub3 /种子的形态、粒度、物相和化学纯度。钛酸锶种子将用作层状制造的模板，在多晶基质中生长大型铌镁-钛酸铅(PMN-PT)晶体。在熔融KCl盐中，温度为1200 ~ 1300℃，合成了Sr/sub - 3/Ti/sub - 2/O/sub - 7/等不对称单晶颗粒。获得了高纵横比为7-10的片状形貌。XRD和SEM分析表明，该材料具有发育良好的矩形面单晶结构。然后在第二次熔盐合成中，将片状Sr/sub 3/Ti/sub 2/O/sub 7/颗粒与TiO/sub 2/反应，制备出SrTiO/sub 3/颗粒。获得了边缘长度为10-40 /spl mu/m、厚度为1-4 /spl mu/m的矩形表面的血小板SrTiO/ sub3 /颗粒。介绍了处理步骤对血小板的形态、颗粒大小和组成的影响。高宽高比SrTiO/sub - 3/血小板是实现有织构PMN-PT陶瓷的合适模板候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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