Phase equilibria in the ternary reciprocal system Li, Ba // BO₂, F and growth of bulk β-BaB₂O₄ crystals

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• 作者：E. A. Simonova ; A. E. Kokh ; N. G. Kononova ; V. S. Shevchenko ; D. A. Kokh ; V. A. Vlezko and P. P. Fedorov
• 关键词：phase diagrams ; single-crystal growth ; nonlinear optical materials ; borates
• 刊名：Journal of Applied Crystallography
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：50
• 期：1
• 页码：22-29
• 全文大小：1350K
• ISSN：1600-5767

文摘

In order to find the optimum solvent for the growth of nonlinear optical &beta;-BaB₂O₄ crystals, the phase relationships in the ternary reciprocal system Li, Ba // BO₂, F have been studied using solid state synthesis, differential thermal analysis and X-ray powder diffraction. Isothermal and polythermal sections of the system Li, Ba // BO₂, F are reported. In the studied system, the following compounds are formed: LiBa₂B₅O₁₀ (melts by peritectic reaction at 930&deg;C, <em>i.e.em> 1203 K) and LiBaF₃ (melts incongruently at 850&deg;C, <em>i.e.em> 1123 K). Visual polythermal analysis of seeding and growth of &beta;-BaB₂O₄ crystals in this system was carried out. The primary crystallization field of &beta;-BaB₂O₄ was defined. Using the top-seeded pulling technique, a &beta;-BaB₂O₄ crystal of 93 mm in diameter, 34 mm in height and 520 g in weight has been grown.