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根据铌酸锂晶体本征缺陷的Ｌｉ空位模型，提出了掺镁铌酸锂晶体的缺陷结构模型；计算出了掺镁铌酸锂晶体中Ｌｉ２Ｏ，Ｎｂ２Ｏ5的含量、［Ｌｉ］／［Ｎｂ］比以及晶体的密度随掺镁浓度的变化关系．计算结果与文献中报道的实验结果相符合According to the Li vacancy model of intrinsic defect in LiNbO3 the defect structures formed in LiNbO3:Mg with varying Mg contents are proposed. The Ｌｉ２Ｏ，Ｎｂ２Ｏ5 contents ［Ｌｉ］／［Ｎｂ］ ratio, in crystals and the densities of the crystals are calculated by using the defect models. The calculated calues are in good agreement with the experimental results.
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