提拉法生长KTa_(1-x)Nb_xO_3晶体的组分均匀性研究  

Study on Composition Uniformity of KTa_(1-x)Nb_xO_3 Crystals Growth by Czochralski Method

作　　者：王旭平[1] 王继扬[2] 刘冰[1] 

机构地区：[1]山东省科学院新材料研究所,济南250014 [2]山东大学晶体材料国家重点实验室,济南250100

出　　处：《人工晶体学报》2010年第B06期48-53,共6页Journal of Synthetic Crystals

基　　金：山东省科学院科技发展基金(No.2008010);济南市科技明星计划(No.200908240463);山东省自然科学基金青年基金项目(2009ZRC01014)

摘　　要：本文报道了使用提拉法在KNbO3-KTaO3固熔体体系中生长立方相KTa1-xNbxO3(KTN)晶体的工艺。从理论上分析了影响KTN晶体均匀性的主要原因为熔体组分和生长温度,并根据KNbO3-KTaO3固溶体相图分析了晶体组分变动和生长温度的定量关系;对相同组分熔体体系中生长出的不同尺寸KTa0.64Nb0.36O3晶体的均匀性测试表明,采用大坩埚生长小晶体的工艺方法可有效改善KTN晶体的均匀性。Cubic phase KTa1-xNbxO3 single crystals have been grown by Czochralski technique in KNbO3- KTaO3 solid solution system. Theoretical analysis indicates that the main factors that effect the KTN uniformity properties are raw materials composition and growth temperature. Quantitative relationship between composition and growth temperature of crystal are analysis according to KNbOa-KTaO3 phase diagram. Composition fluctuations of two KTa0.64 Nb0.36 O3 crystals, with different size but growth from same melt, were measured and the results indicate that homogeneous properties of KTN crystal can be improved by using growth relatively small crystal in masses of raw materials technique.

关 键 词：钽铌酸钾 晶体生长 生长条纹 

分 类 号：O732[理学—晶体学]