Morphology control and phase transition of hexagonal sodium niobate particles
Morphology control and phase transition of hexagonal sodium niobate particles
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DOI：
10.1016/j.ceramint.2017.04.060
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发表时间：
2017-08
影响因子：
5.2
通讯作者：
Yao Lu;T. Karaki;T. Fujii;Yoshiaki Ido;Yongxiang Li;Y. Sakai
中科院分区：
文献类型：
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作者：
Yao Lu;T. Karaki;T. Fujii;Yoshiaki Ido;Yongxiang Li;Y. Sakai
采用水热法合成了具有钛铁矿结构和片状形貌的层状NaNbO 3颗粒。在水热反应过程中，通过SEM监测固体产物随矿化剂浓度增加的形态演变。通过仔细控制矿化剂浓度，获得直径为10-60 µm、厚度为1-10 µm的颗粒。在600 °C的热处理过程中，颗粒从钛铁矿结构转变为钙钛矿结构。它们的板状形态保持与表面上的一些裂纹。通过EBSD和XRD分析，分别从微观和宏观上表征了钙钛矿颗粒的表面取向。结果表明，较薄的颗粒倾向于在（00 l）晶面中更取向。
Hexagonal NaNbO3particles with an ilmenite structure and plate-like morphology were synthesized by a hydrothermal method. The morphological evolution of the solid products with the increasing mineralizer concentration was monitored via SEM during the hydrothermal reaction. By carefully controlling the mineralizer concentration, particles with a diameter of 10–60 µm and a thickness of 1–10 µm were obtained. The particles were transformed from the ilmenite structure into the perovskite structure during the thermal treatment at 600 °C. Their plate-like morphology was maintained with some cracking on the surface. The surface orientation of the perovskite particles was micro- and macroscopically characterized by EBSD and XRD analysis, respectively. The results indicate that thinner particles tend to be more oriented in the (00 l) crystal planes.