Noncongruent nearly stoichiometric/lithium‐deficient LiTaO₃ crystal was grown by lithium‐rich/lithium‐deficient chemical vapor‐phase‐equilibration (VPE) technique, and low‐cost two‐phase powder LiNbO₃‐Li₃NbO₄ or LiNbO₃‐LiNb₃O₈ instead of expensive LiTaO₃‐Li₃TaO₄ or LiTaO₃‐LiTa₃O₈ was used in the VPE experiments. The LiTaO₃ crystalline phase in the lithium‐rich/lithium‐deficient crystal was confirmed by X‐ray analysis. The lithium‐rich/lithium‐deficient VPE‐induced lithium‐oxide (Li₂O) molar content increase/reduction was measured as a function of VPE duration using gravimetric method, and empirical relations between them are presented for both cases. We show that both the lithium‐rich and lithium‐deficient VPE techniques based on the two‐phase powder LiNbO₃‐Li₃NbO₄ or LiNbO₃‐LiNb₃O₈ can be successfully used to adjust the lithium‐oxide content in a LiTaO₃ crystal and produce a noncongruent nearly stoichiometric or lithium‐deficient crystal plate with desired lithium‐oxide content.

中文翻译：

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铌基两相粉末化学汽相平衡法生长非全相LiTaO3晶体

通过富锂/缺乏锂的化学汽相平衡（VPE）技术和低成本的两相粉末LiNbO ₃ -Li ₃ NbO ₄或LiNbO _3-来生长几乎全化学计量/锂缺乏的LiTaO ₃晶体。在VPE实验中使用LiNb ₃ O ₈代替昂贵的LiTaO ₃ -Li ₃ TaO ₄或LiTaO ₃ -LiTa ₃ O ₈。LiTaO ₃X射线分析证实了富锂/锂缺乏晶体中的结晶相。使用重量分析法测量富锂/缺乏锂的VPE引起的氧化锂（Li ₂ O）摩尔含量的增加/减少与VPE持续时间的关系，并给出了这两种情况之间的经验关系。我们表明，基于两相粉末LiNbO ₃ -Li ₃ NbO ₄或LiNbO ₃ -LiNb ₃ O ₈的富锂和贫锂VPE技术均可成功用于调节LiTaO中的锂氧化物含量₃ 结晶并生产出具有所需氧化锂含量的非全近化学计量或锂不足的晶体板。