Templated grain growth of textured Sr/sub 2/Nb/sub 2/O/sub 7/
Templated grain growth of textured Sr/sub 2/Nb/sub 2/O/sub 7/
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DOI：
10.1109/isaf.1996.598167
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发表时间：
1996-08
期刊：
影响因子：
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通讯作者：
B. Brahmaroutu;G. Messing;S. Trolier-McKinstry;U. Selvaraj
中科院分区：
文献类型：
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作者：
B. Brahmaroutu;G. Messing;S. Trolier-McKinstry;U. Selvaraj
Sr/sub 2/Nb/sub 2/O/sub 7/是一种高温压电材料，但作为多晶陶瓷很难极化。为了解决这个问题，开发了一种基于模板晶粒生长（TGG）的方法来生产织构化样品。为了实现TGG，需要精细的基质粉末、单晶模板颗粒和用于在基质中定向模板颗粒的制造技术。采用熔盐法合成了单晶模板粒子。以SrCO/sub 3/和Nb/sub 2/O/sub 5/为原料，以2：1的摩尔比通过固相反应合成了基体粉末。将模板颗粒分散在基体粉末中并流延。在流延和随后的层压过程中的剪切场诱导的初始取向。烧结导致在致密基体中的取向模板颗粒的生长，从而增加晶粒取向的程度。研究了工艺参数和原料粉对显微组织和织构的影响。
Sr/sub 2/Nb/sub 2/O/sub 7/, a candidate material for high temperature piezoelectric applications, is difficult to pole as a polycrystalline ceramic. To circumvent this problem, a process based on templated grain growth (TGG) for producing textured samples was developed. To accomplish TGG, fine matrix powder, single crystal template particles, and a fabrication technique for orienting template particles in the matrix are required. Single crystal template particles were synthesized by a molten salt technique. The matrix powder was synthesized by solid state reaction of SrCO/sub 3/ and Nb/sub 2/O/sub 5/ in a 2:1 molar ratio. The template particles were dispersed in the matrix powder and tape cast. The initial orientation was induced by the shear field during tape casting and subsequent lamination. Sintering leads to the growth of oriented template particles in the dense matrix, thereby increasing the degree of grain-orientation. The effect of processing parameters and starting powders on the microstructure and texture is presented.