Unidirectionally Textured CaBi4Ti4O15 Ceramics by the Reactive Templated Grain Growth with an Extrusion
Unidirectionally Textured CaBi4Ti4O15 Ceramics by the Reactive Templated Grain Growth with an Extrusion
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DOI：
10.1143/jjap.39.5577
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发表时间：
2000-09
影响因子：
1.5
通讯作者：
Tsuguto Takeuchi;T. Tani;Y. Saito
中科院分区：
文献类型：
--
作者：
Tsuguto Takeuchi;T. Tani;Y. Saito
采用反应模板晶粒生长法（RTGG），采用挤压工艺制备了具有独特织构的致密CaBi4Ti4O15（CBT）陶瓷。片状Bi4Ti3O12（BIT）颗粒，CBT的反应模板，与其他氧化物和碳酸盐粉末混合，并通过挤出单向排列。在烧结过程中，定向的CBT晶粒在定向的BIT颗粒上原位形成，模板晶粒的生长和致密化最终形成织构化的CBT陶瓷。X射线衍射和扫描电子显微镜的观察表明，板状CBT颗粒是单向取向平行于挤出方向，没有单轴排列。在挤压方向极化的织构CBT陶瓷表现出机电耦合系数（k33）和压电系数（d33和g33）的两倍以上的一个nontextured陶瓷具有相同的组合物。
Dense CaBi4Ti4O15 (CBT) ceramics with a unique texture were prepared by the reactive templated grain growth (RTGG) method using an extrusion technique. Plate-like Bi4Ti3O12 (BIT) particles, a reactive template for CBT, were mixed with other oxide and carbonate powders and unidirectionally aligned by extrusion. During sintering, oriented CBT grains were formed in situ topotaxially on the oriented BIT particles, and the templated grain growth and their densification eventually fabricated textured CBT ceramics. X-ray diffraction measurements and scanning electron microscopic observations revealed that the plate-like CBT grains were unidirectionally oriented parallel to the extruding direction without uniaxial alignment. Textured CBT ceramics poled in the extruding direction exhibited electromechanical coupling coefficients (k33) and piezoelectric coefficients (d33 and g33) more than two times as large as one of nontextured ceramics with the same composition.