硅酸盐学报

铌酸钾钠基无铅压电材料的水热法制备和结构调控

作者：甄玉花1 2 刘艳1 贾凯丽1 孙富华1 张敏1

关键词：铌酸钾钠压电陶瓷水热法

分类号：TB34

出版年,卷(期):页码：2014,42(4):432-436

DOI：10.7521/j.issn.0454－5648.2014.04.02

摘要：

采用水热合成法分成铌酸钾钠(KNN)，研究了水热起始碱浓度、反应温度以及添加剂种类和浓度对其晶体结构与形貌的影响。研究结果表明：当起始碱浓度比大于或小于1时，KNN晶粒以台阶式生长形成方块晶粒，而碱浓度比接近1时，KNN晶粒细化并大量团聚成球形；当倾向形成富钠型KNN时，铌酸钠长成了纳米棒。当水热反应温度低于200℃时，得到的晶体产物是水热反应的中间产物，经过后续热处理可直接转化为KNN结晶物；添加不同浓度(1～10g/L)的添加剂聚乙二醇400(PEG400)、三乙醇胺、十二烷基苯磺酸钠(SDBS)、乙二胺四乙酸(EDTA)后，均能得到KNN结晶体，但对KNN晶粒形貌影响较大，添加5g/L的PEG400可以抑制晶粒团簇，得到良好分散性且晶体形貌规则的KNN纳米晶颗粒。

The influences of parameters (i.e., reaction time, total alkali concentration, initial alkali concentration ratio, reaction temperature) on the structure of potassiumsodium niobate (KNN) synthesized by a hydrothermal method was investigated. The results show that the cubic grains of the KNN are formed at the initial alkali concentration ratio of > or < 1 due to the stepped growth mechanism. Moreover, the sodium niobate nanorods can be obtained when Nariched KNN and sodium niobate coexist. The hydrothermal temperature has an effect on the reaction process. The crystalline grains of KNN can be only obtained at > 180℃. The use of additives (i.e., polyethylene glycol 400 (PEG400), triethanolamine, sodium dodecyl benzene sulfonate (SDBS), ethylenediaminetetraacetic acid (EDTA) at different concentrations in the synthesis can affect the microstructure of the KNN.

基金项目：

国家自然科学基金(51302319)；教育部博士点新教师基金(20110133120010)；山东省自然科学基金(ZR2011EMQ016)；中央高校基本科研业务经费(14CX02003A)。

作者简介：

第一作者：甄玉花(1979—)，女，博士，副教授。

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