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大截面溴化钾晶体生长工艺研究
作者:郑东阳1 崔亚军1 李春1 2 刘贺1 王丹1 林海1 2 杨立楠2 曾繁明1* 刘景和1 2 
单位:1. 长春理工大学 光电功能材料教育部工程研究中心 长春130022 2. 长春长理光电技术有限公司 长春130022 
关键词:溴化钾单晶 多晶料 熔体与固体结构 配位数 微提拉晶体生长 
分类号:O782
出版年,卷(期):页码:2015,43(1):0-0
DOI:10.7521/j.issn.0454-5648.2015.01.09
摘要:

 对溴化钾原料进行纯化、成型与热处理,制备出 200 mm×20 mm的多晶料。采用电阻加热Czochralski法,在合理的温场下生长出了 150 mm×150 mm的溴化钾单晶。为了有效解决了放肩过程中晶体表面裂纹等问题,采用了一控(水温)、双变(拉速、转速)微提拉放肩新工艺生长晶体。XRD分析表明,生长的晶体为立方晶系的KBr,空间群Fm3m,晶格常数为a=0.6599 nm。分析了晶体中相互作用力及能量关系,认为溴化钾晶体质点间的相互作用不仅存在离子键的相互作用,同时还存在三体力及Van der Waals力的作用。根据半经验公式计算出熔融状态下的溴化钾的配位数为4。另外,晶体的透光性能测试表明,厚度5 mm的样品的透射率为90%。

 Potassium bromide (KBr) polycrystalline material with the size of  200 mm×20mm was obtained after the KBr raw material was purified, formed and annealed. The KBr single crystal with the size of  150mm×150mm was grown by a resistance heating Czochralski (Cz) method. In order to efficiently eliminate the surface cracks in shoulder-expanding process, the crystal was grown by using a “one controlled (water temperature) and double variety (pulling rate and rotation rate)” micro-pulling and shoulder-expanding technique. According to the analysis by X-ray diffraction, KBr crystal grown belongs to a cubic crystal system with the space group Fm3m and the lattice parameter (a) of 0.6599 nm. Also, the interaction between the crystals is due to an ionic bond interaction, three body forces and van der Waals force. The coordination number of KBr in melt is 4 according to the semi-empirical formula. The transmittance of the sample with the thickness of 5 mm is 90%.

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基金项目:
基金项目:吉林省科技发展计划(20110803)资助项目。
作者简介:
第一作者:郑东阳(1973—),男,博士研究生。 通信作者:曾繁明(1976—),男,博士,教授,博士研究生导师。
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参考文献:

 参考文献:

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