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发明公开
CN103966659A 铌酸钾钠KNN单晶的制备方法 失效 - 权利终止

铌酸钾钠KNN单晶的制备方法
摘要：
本发明公开了一种制备铌酸钾钠KNN单晶的方法，包括如下步骤：按照摩尔比x:(1-x):1称取K2CO3、Na2CO3和Nb2O5，球磨混匀，高温下坩埚热处理得到KNN（KxNa1-xNbO3）多晶；再照摩尔比yx:y(1-x):100称取K2CO3助熔剂、Na2CO3助熔剂和KxNa1-xNbO3，球磨混匀，高温下坩埚热处理；将生长用起始用料置于生长坩埚中并填满坩埚，采用顶部籽晶（优先选择 方向KNN单晶）助熔剂提拉法生长KNN单晶。本发明提供的技术可以生长直径大于25mm，长度大于10mm的KNN单晶，其压电常数d33达到120pC/N，机电耦合系数kt达到48.3%。
摘要（英）：

The present invention discloses a potassium sodium niobate KNN single crystal preparation method, which comprises: weighing K2CO3, Na2CO3, and Nb2O5 according to a molar ratio of x:(1-x):1, carrying out ball milling to uniformly mix, and carrying out a heat treatment at a high temperature with a crucible to obtain a KNN(KxNa1-xNbO3) polycrystal; weighing a K2CO3 flux, a Na2CO3 flux and the KxNa1-xNbO3 according to a molar ratio of yx:y(1-x):100, carrying out ball milling to uniformly mix, and carrying out a heat treatment at a high temperature with the crucible; and placing the growth starting material into a growth crucible, filling the crucible, and adopting a top seed crystal (preferentially selecting the <001> direction KNN single crystal)flux Czochralski method to grow the KNN single crystal. With the technology, the KNN single crystal with a diameter of more than 25 mm and a length of more than 10 mm can grow, wherein the piezoelectric constant d33 achieves 120 pC/N, and the electromechanical coupling coefficient kt achieves 48.3%.

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