碘化钾单晶的非真空密闭坩埚下降法生长  

Growth of Potassium Iodide Single Crystal by Vertical Bridgman Method in Nonvacuum Atmosphere

作　　者：王苏静[1] 陈红兵[1] 方奇术[1] 徐方[1] 梁哲[1] 蒋成勇[1] 杨培志[2] 

机构地区：[1]宁波大学材料科学与工程研究所,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315211 [2]昆明物理研究所,昆明650223

出　　处：《人工晶体学报》2010年第1期39-43,共5页Journal of Synthetic Crystals

基　　金：宁波市自然科学基金(No.2009610016);浙江省自然科学基金(Y4090057);宁波大学王宽诚幸福基金资助;浙江省中青年学科带头人培养专项经费支持

摘　　要：本文报道了KI单晶在非真空密闭条件下的坩埚下降法生长。以经充分干燥的高纯KI多晶为原料,将KI多晶料密封于套层铂坩埚中,添加少量活性碳粉末,可避免碘化物熔体的氧化与挥发,从而在非真空条件下实现KI单晶的坩埚下降法生长。在晶体生长过程中,炉体温度调节于750～770℃,固液界面温度梯度为30～40℃/cm,坩埚下降速率控制为1～2mm/h,成功生长出尺寸为25mm×50mm的透明完整KI单晶。采用XRD、DTA-TG、透射光谱、荧光光谱对所获KI单晶进行了测试表征,结果表明该单晶具有良好的光学均匀性,在450～2500nm波长范围的光学透过率达70%以上,其光学吸收边位于280nm左右;在266nm脉冲光激发下,该单晶具有397nm峰值波长的荧光发射。The Bridgman growth of KI single crystal in nonvacuum atmosphere was reported in this paper.KI polycrystalline agent with high purity was used as raw material after it was dried thoroughly.The raw material was sealed in a double-shell platinum crucible,added with a small amount of carbon powders,so as to avoid the oxidization and volatilization of the iodide melt in the crystal growth.In the Bridgman growth,the furnace temperature was controlled at 750-770 ℃ and the temperature gradient across the solid-liquid interface was adjusted at 30-40 ℃/cm.With the crucible lowering rate in the range of 1-2 mm/h,a transparent KI single crystal with size of 25 mm×50 mm had been grown successfully by the vertical Bridgman process in non-vacuum atmosphere.The crystal was characterized by XRD,DTA/TG,transmission spectrum and fluorescence spectrum.The transmission spectrum indicates a high optical transmittance of more than 70% in the wavelength range of 400-2500 nm with an absorption edge at 280 nm.Upon the excitation of 266 nm pulse,the fluorescence spectrum shows a fluorescent emission peaked at 397 nm.

关 键 词：碘化钾单晶 坩埚下降法 光谱性质 

分 类 号：O782[理学—晶体学]