中国物理B ›› 1993, Vol. 2 ›› Issue (7): 523-527.doi: 10.1088/1004-423X/2/7/006

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

THERMODYNAMIC ANALYSIS AND FORMATION ENTHALPY CALCULATION OF OXYGEN VACANCY DEFECT IN DOPED LITHIUM NIOBATE CRYSTALS

强亮生, 张洪喜, 徐崇泉, 徐玉恒   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150006, China
  • 收稿日期:1992-06-30 修回日期:1992-11-15 出版日期:1993-07-20 发布日期:1993-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China.

THERMODYNAMIC ANALYSIS AND FORMATION ENTHALPY CALCULATION OF OXYGEN VACANCY DEFECT IN DOPED LITHIUM NIOBATE CRYSTALS

QIANG LIANG-SHENG (强亮生), ZHANG HONG-XI (张洪喜), XU CHONG-QUAN (徐崇泉), XU YU-HENG (徐玉恒)   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150006, China
  • Received:1992-06-30 Revised:1992-11-15 Online:1993-07-20 Published:1993-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China.

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摘要： Based on the thermodynamic analysis of oxygen vacancy defects in lithium niobate (LiNbO3 (LN)) and the data of thermogravimetric experiment, the formation enthalpies of congruent and several rare-earth (RE) doped LN crystals have been calculated. It was found that the formation enthalpy of oxygen vacancies can be decreased evidently by doping with valence-changeable RE ions. The experimental results were discussed and a new reduction process for photorefractive LN crystals at a relatively low temperature was proposed, and the reduction-treated crystals showed good effect in practical use.

Abstract: Based on the thermodynamic analysis of oxygen vacancy defects in lithium niobate (LiNbO3 (LN)) and the data of thermogravimetric experiment, the formation enthalpies of congruent and several rare-earth (RE) doped LN crystals have been calculated. It was found that the formation enthalpy of oxygen vacancies can be decreased evidently by doping with valence-changeable RE ions. The experimental results were discussed and a new reduction process for photorefractive LN crystals at a relatively low temperature was proposed, and the reduction-treated crystals showed good effect in practical use.

中图分类号:  (Other thermodynamical quantities)

  • 65.40.G-
61.72.J- (Point defects and defect clusters) 61.72.up (Other materials)