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Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (1): 65-67.

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Formation Enthalpy Calculation of Oxygen Vacancy Defect in Doped Lithium Niobate Crystals

QIANG Liang-sheng1, LI Yao2, TANG Dong-yan1, XU Chong-quan1, WEI Yong-de1   

  1. 1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China;
    2. Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, P. R. China
  • Received:2002-08-15 Online:2004-02-24 Published:2011-08-06
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20171015).

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Abstract: The relationship between temperature and oxygen vacancy concentration is deduced in this paper. Based on the data of thermal weight-loss experiment, the formation enthalpies of congruent and several doped LN crystals have been calculated. It was found that the formation enthalpy of oxygen vacancies can be decreased evidently by doping valence-changeable ions. The experimental results were discussed and a new reduction process of the photorefractive LN crystal at a relatively low temperature was proposed, and the reduced crystals showed a good effect in practical use.

Key words: Formation enthalpy calculation, Oxygen vacancy defect, Doped lithium niobate crystal