Top-Seeded Solution Growth, Morphology, and Properties of a Polar Crystal Cs2TeMo3O12

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• 作者：Junjie Zhang ; Xutang Tao ; Youxuan Sun ; Zhonghan Zhang ; Chengqian Zhang ; Zeliang Gao ; Haibing Xia ; Shengqing Xia
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：May 4, 2011
• 年：2011
• 卷：11
• 期：5
• 页码：1863-1868
• 全文大小：913K
• 年卷期：v.11,no.5(May 4, 2011)
• ISSN：1528-7505

文摘

Single crystals of the polar hexagonal tungsten oxide (HTO) material Cs₂TeMo₃O₁₂ with dimensions up to 20 脳 20 脳 16 mm³ were grown successfully through a top-seeded solution growth (TSSG) method using a TeO₂鈭扢oO₃ mixture as a self-flux. The Cs₂TeMo₃O₁₂ crystals grown from a solution with a low concentration exhibit {0002}, {101虆0}, and {101虆1̅} facets, which are in good accordance with the predicted growth morphology based upon the Bravais鈭扚riedel and Donnay鈭扝arker (BFDH) methods. However, the crystals grown from solution with a high concentration show additional {101虆2̅} facets, which are not predicted. Crystals grown by using the [0001]-oriented seed have more regular shapes as compared with those grown by using the [21虆1̅0]-oriented seed. Cs₂TeMo₃O₁₂ crystallizes in the polar hexagonal space group P6₃ (no. 173). The result of the high-resolution X-ray diffraction indicates that the full-width at half-maximum (fwhm) of the rocking curve is 18.96鈥测€? Thermal analysis and powder X-ray diffraction demonstrate that Cs₂TeMo₃O₁₂ melts incongruently at 494.95 掳C. Optical measurements indicate that the Cs₂TeMo₃O₁₂ crystal has a broad transmission window range from 0.43 to 5.38 渭m. In addition, polarization measurements indicate that although Cs₂TeMo₃O₁₂ is polar, the material is not ferroelectric.