Primary Crystallization Region of NaAl(MoO4)2, Cr3+ Doping, Crystal Growth, and Characterization

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• 作者：A. Peñ ; a ; R. Solé ; Jna. Gavaldà ; J. Massons ; F. Dí ; az ; and M. Aguiló
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：January 24, 2006
• 年：2006
• 卷：18
• 期：2
• 页码：442 - 448
• 全文大小：330K
• 年卷期：v.18,no.2(January 24, 2006)
• ISSN：1520-5002

文摘

The main aim of this study was to determine the primary crystallization region of NaAl(MoO₄)₂ (NAM)in its self-flux. We determined the saturation temperature isotherms of NAM and two neighboring phases,Na₂Mo₂O₇ and Al₂(MoO₄)₃, in the ternary system Na₂O-Al₂O₃-MoO₃. We have analyzed several growingconditions in an effort to optimize the quality of single crystals obtained by a top-seeded solution growthtechnique. In the present work, we studied the thermal behavior of undoped and Cr³⁺-doped crystal andfound a reversible phase transition at about 780 K. We also studied the evolution of the cell parametersof NAM as a function of temperature between room temperature and 573 K, and the linear thermalexpansion tensor was determined. Furthermore, we determined some optical properties, such as thetransparency window of NaAl(MoO₄)₂ and NaAl_0.99Cr_0.01(MoO₄)₂, the UV cutoff for both materials, andthe spectroscopic characterization of Cr³⁺ in this crystal.