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Journal of Materials Science & Technology 2019年第9期35卷 1982-1988页

作者： Xu Wang Nan Zhang Yujie Zhong BailingJiang Langhong Lou Jian Zhang Jingyang Wang Shool of Material Science and Engineering Xi'an University of TechnologyXi'an710048China School of Materials Science and Engineering Xi'an Shiyou UniversityXi'an710065China Institute of Metal Research. Chinese Academy of Sciences Shenyang110016China

Large size,high-density(99.97%)and well-organized Al2O3/Y3Al5O12(YAG)eutectic ceramics were prepared by the modified bridgman *** evolution of the three dimensional microstructure and micropores were *** diameter of the micro-pores and the porosity decreased during directional *** average equivalent diam eter of the micro-pores was 2.41μm in the well-prepared eutectic *** of the pores(98.07%)were smaller than 4μ*** data are comparable to those prepared by the optical floating zone *** as-grown eutectic ceramics were polycrystalline,but the interfaces were well-bonded and there were no amorphous phases in the *** misfits of the different crystallographic relationships were calculated,and the bottleneck of the single-crystal preparation was *** results could provide theoretical guidance for the preparation of large,single-crystal Al2O3/YAG eutectic ceramics by the modified bridgman method.

关键词： Al2O3/YAG eutectic ceramics Crystallography Interfaces bridgman method

Computational Analysis of the Vertical bridgman Growth of Te Doped GaSb Under Microgravity

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Chinese Physics Letters 2000年第10期17卷 775-777页

作者： LIU Yong-Cai CHEN Wan-chun GE Pei-Wen HUO Chong-Ru Institute of Physics Chinese Academy of SciencesBeijing 100080 School of Chemical Engineering Tianjin UniversityTianjin 300072 National Microgravity Laboratory Chinese Academy of SciencesBeijing 100080

A transient analysis of Te doped GaSb melt growth process is performed using finite element *** solute concentration at the growth interface increases with time because of k<*** growth interface shape becomes a little flat at the beginning of the growth compared with the initial *** segregation occurs even under theμg *** segregation increases with the increase of gravity when gravity is small,and reaches a maximum at g=10^(-3)for our system.

关键词： interface shape bridgman

Characterization of CdZnTe crystal grown by bottom-seeded bridgman and bridgman accelerated crucible rotation techniques

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中国有色金属学会会刊：英文版 2009年第S3期19卷 622-625页

作者：王涛介万奇徐亚东查钢强傅莉 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The growth of CdZnTe crystals with diameter up to 60 mm using bottom-seeded bridgman method as well as bridgman accelerated crucible rotation technique (ACRT-B) was investigated. Both ingots exhibit high yields, where single crystal with the volume exceeding 200 cm3 is produced. The crystal properties of two ingots were compared in the aspects of yields, crystalline quality and composition uniformity. For CdZnTe ingot grown by bottom-seeded bridgman method, the full width at half-maximum (FWHM) of X-ray rocking curve was determined to be 36″, indicating a better crystalline quality than ingot grown by ACRT-B method, which gave FWHM of 56″. The composition distribution of Zn and In in CdZnTe was determined by using electron probe microanalysis (EPMA) and inductively coupled plasma mass spectrometry (ICP-MS), respectively. The effective segregation coefficients of Zn kZn and In kIn in the two ingots were evaluated by fitting the experimental data with the Pfann equation.

关键词： seed crystals cadmium compounds accelerated crucible rotation technique bridgman technique

Shear-band spacing controlled by bridgman solidification in Dendrite/BMG composites

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Science China(Physics,Mechanics & Astronomy) 2009年第10期52卷 1632-1636页

作者： WANG Song ZHANG Yong State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The paper reports that the shear-band spacing can be controlled by the bridgman solidification technique for a model alloy of *** volume percent of the glass phase is almost independent of the withdrawal *** shear-band spacing reaches a minimum of about 3 μm with withdrawal velocity of 0.8 mm/*** optimized mechanical properties,such as the fracture strength of ～2100 MPa and plastic strain of ～19%,have been *** large plastic deformation is due to the dislocation slips in the dendrite phase and shear-band propagations in the glass phase.

关键词： Shear-band spacing bridgman solidification BMG composites

Optical spectra of Eu^(2+) ion doped KMgF_3 single crystals grown by bridgman method

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Optoelectronics Letters 2019年第1期15卷 26-30页

作者： SHI Xu-dong XIA Hai-ping HU Jian-xu ZHANG Jian-li ZHU Yong-sheng CHEN Bao-jiu Key Laboratory of Photo-electronic Materials Ningbo University College of Physics and Electronic Engineering College of Chemistry and Pharmaceutical Engineering Nanyang Normal University Department of Physics Dalian Maritime University

High-quality KMgF_3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved bridgman method.X-ray diffraction(XRD),photoluminescence spectra and fluorescence lifetime were *** results indicate the reduction of Eu^(3+)to Eu^(2+)in the KMgF_3 single *** the excitation of 259 nm,370 nm and 394 nm,the sample has two distinct emissions of Eu^(2+):4f^7→4f^7(～363 nm)and 4f^65d^1→4f^7(～440 nm).The substitution site for Eu ion is *** optical property investigation result shows that the Eu^(2+)doped KMgF_3 single crystal may be used as potential laser media and related materials for optical devices.

关键词： crystals bridgman method investigation

化合物晶体bridgman生长过程中的溶质再分布

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中国科学院研究生院学报 2007年第2期24卷 161-166页

作者：石科峰卢文强中国科学院研究生院物理科学学院北京100049

以HgCdTe化合物的晶体生长为例,针对竖直bridgman晶体生长过程,数值模拟了液相区界面处溶质分凝产生的溶质扩散边界层随拉晶速度和初始浓度的变化情况.结果表明:在拉晶速度从小变大的情况下,相变界面处溶质扩散受到抑制,浓度边界层变得... 详细信息

以HgCdTe化合物的晶体生长为例,针对竖直bridgman晶体生长过程,数值模拟了液相区界面处溶质分凝产生的溶质扩散边界层随拉晶速度和初始浓度的变化情况.结果表明:在拉晶速度从小变大的情况下,相变界面处溶质扩散受到抑制,浓度边界层变得越来越薄;当初始浓度不同时,分凝系数的变化决定了晶体生长过程中析出成分的多少,从而影响到液相区的溶质扩散情况,随着初始浓度的增大,溶质边界层有变薄的趋势,并且当初始浓度较大时这种趋势更为明显.

关键词： bridgman 晶体生长分凝系数边界层

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bridgman晶体中应力的计算机估算

人工晶体 1985年第2期 91-95页

作者：黄朝恩人工晶体研究所

本文用有元分析法计算了 bridgman 法生长的晶体中的应力分布。已经发现,温度的分布,尤其是温度梯度的变化是影响热应力极大值的主要因素。固—液界面形状是第二位的因素,在均匀的温度梯度中凹界面具有最大的应力。文中还讨论了外加应... 详细信息

本文用有元分析法计算了 bridgman 法生长的晶体中的应力分布。已经发现,温度的分布,尤其是温度梯度的变化是影响热应力极大值的主要因素。固—液界面形状是第二位的因素,在均匀的温度梯度中凹界面具有最大的应力。文中还讨论了外加应力的影响。

关键词：晶体应力分布温度梯度 bridgman 界面形状最大剪应力计算机

计算bridgman生长中温度分布的有限元方法

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人工晶体 1984年第2期 112-117页

作者：黄朝恩人工晶体研究所

本文提供了一个用来计算在 bridgman 晶体生长的坩埚里的温度分布的有限元方法。文中简要描述了所设计的计算机程序,并用以证实早先文献中提出的界面形状的变化与液、固相的热导率,以及与温度梯度的关系。

关键词：单元的方框图熔体电器构件方程方程式界面形状 bridgman 计算机程序突变点有限元方法温度梯度温度场分布(力学) 温度分布导热系数热力学性质热导率导热率

坩埚加速旋转技术对CdZnTe晶体bridgman法生长过程影响的数值模拟研究

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坩埚加速旋转技术对CdZnTe晶体Bridgman法生长过程影响的数值模拟...

P-RAP法bridgman技术生长KBr单晶

第十七届全国晶体生长与材料学术会议(CCCG-17)

作者：殷利迎介万奇王涛周伯儒西北工业大学

建立了描述CdZnTe晶体bridgman法生长过程的三维轴对称模型,计算分析了不同坩埚加速旋转(ACRT)参数(包括无坩埚旋转)对晶体生长过程中熔体对流、凝固界面的位置及形貌和Zn成分分布的影响。模拟结果显示,引入ACRT会显著促进熔体的混合,... 详细信息

建立了描述CdZnTe晶体bridgman法生长过程的三维轴对称模型,计算分析了不同坩埚加速旋转(ACRT)参数(包括无坩埚旋转)对晶体生长过程中熔体对流、凝固界面的位置及形貌和Zn成分分布的影响。模拟结果显示,引入ACRT会显著促进熔体的混合,使得晶锭径向上Zn浓度分布比无坩埚旋转时更加均匀,然而Zn在晶锭轴向上的均匀性并没有提高。施加最高转速越大的ACRT,凝固界面前沿的Ekman流对界面形状的影响也越大。当最高转速为6rpm或更高时,出现明显的回熔现象,界面的位置和形状都会有很大的起伏变化,晶体的实际生长速度远大于平均生长速度。当最高转速达到12rpm时,坩埚内壁附近的熔体开始出现Couette流,有利于熔体的混合,消除坩埚内壁上可能存在的形核中心。综合分析以上各个影响因素,尤其是Ekman流和Couette流的影响,给出了优化晶体生长主要参数的建议。

关键词：晶体生长数值模拟 CdZnTe ACRT bridgman

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硅酸盐学报 1988年第5期 452-456页

作者：徐玉恒何正叔陈刚张洪喜肖涤凡李胜华方珮莹张守都上海交通大学中国科学院上海光学精密机械研究所哈尔滨工业大学

采用P-RAP法生长KBr单晶,用CHBr;作为纯化固体粉料的试剂,CCl;与CH;Br;的混合物作为纯化KBr熔体的RAP试剂,解决了晶体粘附坩埚引起坩埚的炸裂问题。初步探讨了P-RAP法生长KBr单晶的反应机理。所生长的KBr晶体的吸收系数较用普通方法生长... 详细信息

采用P-RAP法生长KBr单晶,用CHBr;作为纯化固体粉料的试剂,CCl;与CH;Br;的混合物作为纯化KBr熔体的RAP试剂,解决了晶体粘附坩埚引起坩埚的炸裂问题。初步探讨了P-RAP法生长KBr单晶的反应机理。所生长的KBr晶体的吸收系数较用普通方法生长KBr晶体的吸收系数降低两个数量级。

关键词： P-RAP 晶体吸收系数吸收率 bridgman KBr