铌酸钾锂晶体的生长与极化的研究

Study on Growth and Polarization of KLN Crystal

采用不同成分配比，以 Ｃｚｏｃｈｒａｌｓｋｉ 法生长铌酸钾锂（ Ｋ Ｌ Ｎ） 晶体，研究生长工艺和成分配比对 Ｋ Ｌ Ｎ 晶体性能的影响。选用的轴向温度梯度为２８ ～３５ ℃／ｃｍ ，晶体的旋转速度为５ ～１０ｒ／ｍｉｎ ；晶体的生长速度与 Ｋ Ｌ Ｎ 的生长原料的成分有关。采用场冷法对 Ｋ Ｌ Ｎ 晶体进行极化处理。极化电流密度为２ｍ Ａ／ｃｍ３ ，极化温度为４６０ ～３４０ ℃。生长出透明的没有裂纹的 Ｋ Ｌ Ｎ 晶体。

Using different composition,transparent and free crack KLN crystal have been grown by Czochralski method.The effect of growth technology and composition ratio on the properties of crystal were investigated.Optimal parameters for cyrstal growth are:temperature gradients in axial direction is 28—35℃/cm,rotation speed is 5—10r/min,and pulling rate of KLN crystal depend on composition ration of growth raw materials.The KLN crystal were polarized by field cooling method.The density of polarization current is 2mA/cm 2,and the temperature is 460—340℃.