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首页> 外文期刊>Physics of the solid state >A Fe[Nb]-Li center in stoichiometric LiNbO_3 crystals: Mechanism of formation
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A Fe[Nb]-Li center in stoichiometric LiNbO_3 crystals: Mechanism of formation

机译：化学计量的LiNbO_3晶体中的Fe [Nb] -Li中心：形成机理

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摘要

A new iron center in stoichiometric lithium niobate crystals has been studied by the EPR method. The angular dependences of the EPR spectrum of the center have been used to derive the parameters of its spin Hamiltonian. The data amassed on the variation in the concentrations of two iron centers in lithium niobate crystals annealed in a Li_2CO_3 powder have provided an insight into the mechanism of formation of the new center, as well as corroborated its model proposed by us earlier. According to this model, the center represents a complex of two defects aligned with the polar axis in the crystal: the iron ion at the niobium site and an interstitial lithium ion filling the nearest structural vacancy (Fe~(3+)[Nb]-Li~+[V]). The structure of other Fe~(3+) centers revealed earlier in LiNbO_3 crystals, in which the iron ion occupies the niobium site, has been discussed.
机译：通过EPR方法研究了化学计量的铌酸锂晶体中的新铁中心。中心的EPR光谱的角度相关性已用于导出其自旋哈密顿量的参数。收集在Li_2CO_3粉末中退火的铌酸锂晶体中两个铁中心浓度变化的数据提供了对新中心形成机理的见解，并证实了我们先前提出的模型。根据该模型，中心代表与晶体的极轴对齐的两个缺陷的复合物：铌位处的铁离子和填充最近的结构空位的间隙锂离子（Fe〜（3 +）[Nb]- Li〜+ [V]）。已经讨论了在LiNbO_3晶体中较早发现的其他Fe〜（3+）中心的结构，其中铁离子占据了铌位。

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