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本文测定了LiNb3O8晶体的透光曲线,肯定了晶体发黑的主要原因是氧空位,以及通过退火消除的方法;确定了晶体中氢键形成的原因是大气中水蒸汽和熔体起反应的结果,真空退火是消除氢键的方法;提出了在纯氧气氛下生长LiNb3O8晶体的建议;测定了LiNb3O8晶体的光性方位和主折射率,并和LiNbO3晶体作了比较;讨论了LiNb3O8晶体的光性方位和它的结构关系。The transmit tance curve of the LiNb3O8 crystal is determined. It is clear that the existence of oxygen vacancy is the basic reason of blackening of the crystal and the black colour can be bleached by annealing. It is shown that the cause of the hydrogen bond formation is a chemical reaction of the atmospheric water vapor with the melt. Vacumm annealing is a method to eliminate the hydrogen bond. Crystal growth in pure oxygen atmosphere is suggested. Three principle indices of the LiNb3O8 crystal and the directions of corresponding principle axes with respect to crystallographic axes are determined. And the refractive index of the LiNb3O8 crystal is compared with that of the LiNbO3 crystal. The relationship of the principle indices with the crystal structure is discussed.
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