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坩埚下降法生长钨酸镉单晶的光学均匀性
引用本文:陈红兵,肖华平,徐方,方奇术,蒋成勇,杨培志.坩埚下降法生长钨酸镉单晶的光学均匀性[J].无机材料学报,2009,24(5):1036-1040.
作者姓名:陈红兵  肖华平  徐方  方奇术  蒋成勇  杨培志
作者单位:1. 宁波市新型功能材料及其制备科学国家重点实验室培育基地,宁波大学,材料科学与工程研究所,宁波,315211
2. 昆明物理研究所,昆明,650223
摘    要:采用垂直坩埚下降法生长出大尺寸CdWO4单晶, 通过DSC/TG、XRD、电子探针、透射光谱和X射线激发发射光谱对单晶进行了测试表征, 分析了单晶生长过程中熔体挥发情况和单晶化学成分变化, 研究了所生长单晶的光学均匀性的变化规律. 结果表明, CdWO4单晶生长过程存在比较严重的熔体挥发, 且熔体中CdO比WO3更加易于挥发; CdWO4单晶的化学组成存在不同程度缺Cd的特征, 初期生长晶体的n(Cd)/n(W)比相对高, 后期生长晶体的n(Cd)/n(W)比持续减小, 相应地单晶在380~550nm区域的光透过率略有降低, X射线激发发光强度有所降低, 且发光波长出现略微红移的趋势. 通过提高多晶料纯度、减少熔体挥发和氧气氛退火处理, 可以改善坩埚下降法生长CdWO4单晶的光学均匀性.

关 键 词:钨酸镉  晶体生长  坩埚下降法  光学均匀性
收稿时间:2009-2-3
修稿时间:2009-3-31

Optical Homogeneity of CdWO4 Single Crystal Grown by Vertical Bridgman Process
CHEN Hong-Bing,XIAO Hua-Ping,XU Fang,FANG Qi-Shu,JIANG Cheng-Yong,YANG Pei-Zhi.Optical Homogeneity of CdWO4 Single Crystal Grown by Vertical Bridgman Process[J].Journal of Inorganic Materials,2009,24(5):1036-1040.
Authors:CHEN Hong-Bing  XIAO Hua-Ping  XU Fang  FANG Qi-Shu  JIANG Cheng-Yong  YANG Pei-Zhi
Institution:(1.StateKeyBaseofFunctionalMaterials&PreparationScience,InstituteofMaterialsScience&Engineering,NingboUniversity,Ningbo315211,China;2.KunmingInstituteofPhysics,Kunming630023,China)
Abstract:Large size CdWO4 single crystals were grown by vertical Bridgman process. The crystal was characterized by DSC/TG, XRD, EPMA, optical transmittance and X-ray stimulated luminescence spectra. The melt volatilization in the growth and the chemical composition change of the crystal were analyzed and the optical homogeneity of the grown crystal boule was investigated. It is verified that a serious melt volatilization occurs in the crystal growth, in which CdO in the melt is more prone to volatile. The chemical composition of the grown crystal shows a cadmium lacking characteristics in varying degrees. A higher Cd/W ratio in chemical composition appears in the crystal grown in earlier period, while the Cd/W ratio decreases continuously in the crystal grown afterward. The crystal grown in later period shows somewhat a lower optical transmittance in the wavelength range of 380-550nm and a lower intensity of X-ray stimulated luminescence with a little red-shifted wavelength. By means of purifying the feed material, decreasing the melt volatilization and annealing in oxygen atmosphere, the crystals with better optical homogeneity may be grown by vertical Bridgman process.
Keywords:CdWO4  crystal growth  Bridgman process  optical homogeneity
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