Synthesis and morphology of anisotropic NaNbO3 seed crystals

被引：52

作者：

Chang, Yunfei ^{[1
]}

Yang, Zupei ^{[1
]}

Chao, Xiaolian ^{[1
]}

Liu, Zonghuai ^{[1
]}

Wang, Zenglin ^{[1
]}

机构：

[1] Shaanxi Normal Univ, Key Lab Macromol Sci Shaanxi Prov, Sch Chem & Mat Sci, Xian 710062, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2008年 / 111卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

ceramics; topochemical synthesis; crystal structure; microstructure;

D O I：

10.1016/j.matchemphys.2008.04.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Large platelet NaNbO3 (NN) seed crystals have been successfully synthesized from bismuth layer-structured ferroelectric Bi2.5Na3.5Nb5O18 (BNN) precursor by topochemical microcrystal conversion method. The effects of synthesis parameters, such as salt/oxide ratio, synthesis temperature and Na2CO3/BNN ratio, on the phase structure and morphology of both the BNN precursor and NN partides were investigated. The results show that large platelet BNN precursor with bismuth layer structure was obtained at 1125 degrees C with a salt-to-oxide weight ratio of 1.50:1. Besides, by optimizing the synthesis parameters, anisotropic NN seed crystals with pure perovskite phase were obtained at 975 degrees C with a Na2CO3/BNN molar ratio of 1.50:1. The obtained NN particles are very promising template for texturing (K, Na) NbO3-based ceramics by reactive-temp late grain growth method. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：195 / 200

页数：6

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