摘要
随着CeF_(3)晶体在激光和磁光领域应用的持续发展,大尺寸、高光学质量的CeF_(3)单晶的需求日益急迫,而CeF_(3)熔体的高黏度和低热导率的特性给晶体生长工艺带来了较大挑战。为研究CeF_(3)熔体低导热性引发的生长问题,探究其生长过程中炉体结构和工艺参数对温度分布和结晶界面的影响机制,本工作对热交换坩埚下降法(Heat Exchanger-Bridgman method,HEB)生长大尺寸(ϕ80 mm)CeF_(3)晶体中炉体结构与晶体/熔体温度分布关系、不同生长阶段界面的变化规律以及热场结构对生长界面的作用机制开展了数值模拟研究。研究结果表明:当发热体长度与坩埚长度相适应时,更有利于构建合理的温度梯度场,而放肩和等径生长阶段的凹界面问题则可以通过改变隔板形状和加反射屏调节坩埚壁温度分布得到有效解决。本研究成果不仅可以加深对CeF_(3)晶体结晶习性的理解,炉体结构和生长界面的优化思路对坩埚下降法制备其他晶体同样有实际指导意义。
With the continuous development of CeF_(3) crystals in laser and magneto-optical applications,the demand for CeF_(3) single crystals with large size and high optical quality has become increasingly urgent,while the high viscosity and low thermal conductivity of CeF_(3) melt always bring challenges to crystal growth process.In order to study the growth problem caused by low thermal conductivity of CeF_(3) melt,the influence mechanism of the furnace structure and process parameters on temperature distribution and crystallographic interface during the growth process was explored.In this work,numerical simulations about the growth of large size CeF_(3) crystal(ϕ80 mm)through the heat exchanger-Bridgman method were carried out to analyze the relationship between furnace structure and crystal/melt temperature distribution,the variation of interface shape in different growth stages,and the mechanism of thermal field structure on the growth interface.Results show that when the length of the heating element matches the length of the crucible,it is more conducive to construct a reasonable temperature gradient field.The unfavorable concave interface during the“shouldering”and“cylindering”growth stages can be effectively improved by adjusting temperature distribution on the ampoule wall through changing the baffle shape and adding a reflective screen.Therefore,the result not only deepens understanding of the crystallization habit of CeF_(3) crystals,but also enlightens the furnace and growth interface optimization of other crystals’Bridgman growth.
作者
穆宏赫
王鹏飞
施宇峰
张中晗
武安华
苏良碧
MU Honghe;WANG Pengfei;SHI Yufeng;ZHANG Zhonghan;WU Anhua;SU Liangbi(Key Laboratory of Transparent Opto-fuctional Inorganic Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第3期288-295,共8页
Journal of Inorganic Materials
基金
国家重点研发计划(2021YFB3602503)
上海市科学技术委员会项目(2051107400,20520750200)
中国科学院稳定支持基础研究领域青年团队计划(YSBR-024)
中国科学院一带一路国际合作项目(121631KYSB20200039)
中国电子科技集团第九研究所对外开放项目(2022SK-013)。
关键词
CeF_(3)晶体
热交换坩埚下降法
数值模拟
固液界面
热场优化
CeF_(3)crystal
heat exchanger-Bridgman method
numerical simulation
solid-liquid interface
thermal field optimization
