高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

LuxY1-xAl 3:Ce晶体中伴生(Lu,Y3 Al5O12:Ce相成因研究

丁栋舟1, 陆晟1, 潘尚可1, 张卫东1, 王广东2, 任国浩1   

  1. 1. 中国科学院上海硅酸盐研究所, 上海 201800; 2. 烟台大学环境与材料工程学院, 烟台 264005
  • 收稿日期:2007-07-18 修回日期:2007-09-19 出版日期:2008-05-20 网络出版日期:2008-05-20

Genetic Analysis of the Accompanying of (Lu,Y)3Al5O12:Ce in LuxY1-xAlO3:Ce Single Crystals

DING Dong-Zhou1, LU Sheng1, PAN Shang-Ke1, ZHANG Wei-Dong1, WANG Guang-Dong2, REN Guo-Hao1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China; 2. Environmental and Material Engineering Institute, Yantai University, Yantai 264005, China
  • Received:2007-07-18 Revised:2007-09-19 Published:2008-05-20 Online:2008-05-20

PDF (PC)

2080

被引次数

1

摘要： 采用提拉法制备了LuxY1-xAlO3:Ce晶体样品, 通过XRD物相分析和成分分析, 并结合Lu2O 3-Al2O3二元体系相图以及LuxY1-x AlO3:Ce结构稳定性方面的分析与讨论, 结果表明: 随着熔体中Lu元素含量的增加, 熔体分层加剧, 析晶LuxY1-xAlO3:Ce相的熔体组成区间将向富Lu一侧偏移, 这使得晶体上部易伴生(Lu,Y)3Al5O12:Ce相; 而随着Lu元素含量的提高, LuxY1-xAlO3:Ce晶体的热稳定性降低, 氧空位的存在则使晶体的热稳定性进一步降低, 在接种过程中籽晶表面易发生相分解反应生成(Lu,Y)3 Al5O12:Ce和(Lu,Y) 4 Al2O9:Ce, 籽晶表面相分解产物(Lu,Y)3Al5O12:Ce提供了诱导析晶(Lu,Y)3Al5O12 :Ce相所需的晶核, 这使得晶体的外
表面处易伴生(Lu,Y)3Al5O12:Ce相. 调整配料组成使 n(Lu,Y)2O3 ): n (Al2O3)=1.17～1.00, 加大熔体内部和固液界面处的温度梯度以改善熔体对流、抑制熔体分层以及籽晶表面处的相分解等有助于高Lu元素含量LuxY1-xAlO3 :Ce晶体的获得.

关键词: 铝酸钇镥晶体, 钙钛矿, 石榴石, 伴生

Abstract: LuxY1-xAlO3:Ce single crystal samples were prepared by the Czochralski method. Based on X-ray diffraction (XRD) and composition analyses, and analysis of phase diagram of Lu2O 3-Al2O3 and the structural stability of LuxY1-xAlO3:Ce, it is supposed that as the content of Lu increase, the melt delamination is exacerbated, and the crystallization interval of Lux 1-xAlO3:Ce in the phase diagram may shift towards the interval rich in Lu, resulting in the accompaniment of (Lu,Y)3Al5O12:Ce on the top of LuxY1-xAlO3 :Ce single crystals. With the increase of the content of Lu, the thermal stability of LuxY1-xAlO3:Ce single crystals decreases, the oxygen vacancy in those crystals furthers the decrease, so the seed surface tends to decompose into (Lu,Y3 Al5O12:Ce and (Lu,Y)4Al2O9:Ce while seeding, and the former decomposition product provides the crystal nucleus to induce crystallization of (Lu,Y3Al 5O12:Ce, resulting in the accompaniment of (Lu,Y)3Al5O12:Ce on the coat of LuxY1-xAlO3:Ce single crystals. An adjustment of the melt composition to make the mol ratio n((Lu,Y)2O3):n(Al2O3) equal to 1.17--1.00, and a greater temperature gradient inside the melt and at the solid liquid interface to improve melt convection, restrain melt delamination and the decomposition on the seed surface may contribute to the acquisition of Lux Y1-xAlO3:Ce with high Lu content.

Key words: lutetium yttrium aluminate crystals, perovskite, garnet, accompany

中图分类号: