东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2003, Vol. 24 ›› Issue (8): 788-791.DOI: -

• 论著 • 上一篇    下一篇

添质铝金红石(TiO_2)单晶体焰熔法生长实验及机理

毕孝国;孙旭东;赵洪生   

  1. 东北大学材料与冶金学院;东北大学材料与冶金学院;辽宁享欧晶体材料有限公司 辽宁沈阳　110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 发布日期:2013-06-24
  • 通讯作者: Bi, X.-G.
  • 作者简介:-
  • 基金资助:
    教育部跨世纪优秀人才培养计划基金资助项目;;

Processing and growth mechanism of Al-doped rutile single crystal by flame fusion method

Bi, Xiao-Guo (1); Sun, Xu-Dong (1); Zhao, Hong-Sheng (2)   

  1. (1) Sch. of Mat. and Metall., Northeastern Univ., Shenyang 110004, China; (2) Xiang'ou Crystal Mat. Co. Ltd., Shenyang 110179, China
  • Received:2013-06-24 Revised:2013-06-24 Published:2013-06-24
  • Contact: Bi, X.-G.
  • About author:-
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摘要： 使用添加适量(原子分数为0 4%)Al2O3的金红石粉料,采用焰熔法成功地生长了尺寸为20mm×30mm的透明金红石单晶体,而采用相同工艺使用纯金红石粉料生长的晶体却是蓝黑色不透明的·添质铝在晶体生长过程中有如下作用:Al3+在晶体中取代Ti4+的位置,减少了氧的配位数,因而减少了晶体形成时对氧的需求,从而减少了由于Ti4+还原而形成的Ti3+和非本征氧空位的数量;由于Al3+半径小于Ti4+,因此增加了正离子间距,使氧离子更易于迁移;形成添质后晶体的本征(固有)缺陷对Al′Ti V¨O,提供氧离子扩散通路·因此适量Al2O3的添加从宏观上增加了氧离子在晶体中的扩散速度,避免了大量色心的形成...

关键词: 金红石(TiO2)单晶体, 晶体生长, 添质铝, 焰熔法, Verneuil炉, 活化处理

Abstract: Yellowish and transparent rutile single crystal (ø20 mm × 30 mm) doped with 0.4% (atom fractions) Al2O3 was successfully produced by the flame fusion (improved Verneuil) method, whereas a pure rutile crystal without the doping is dark-blue and not transparent. It is shown that the substitution of Al3+ for Ti4+ reduces the number of Ti3+ due to the reduction of Ti4+, and reduces the non-natural oxygen vacancies and the amount of oxygen needed in the crystal growth. Oxygen diffusivity in the crystal is enhanced by the doping because the radius of A13+ is less than that of Ti4+ and oxygen diffusion path can be widened. Natural 2Al′Ti-V¨O defect pairs form in the Al-doped rutile to provide paths for the migration of oxygen ions. The introduction of Al into the crystal speeds up the diffusion of oxygen ions and eliminates the formation of substantive color centers.

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