Top-Seeded Solution Growth, Structure, Morphology, and Functional Properties of a New Polar Crystal 鈥?Cs2TeW3O12

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• 作者：Peng Zhao ; Hengjiang Cong ; Xiangxin Tian ; Youxuan Sun ; Chengqian Zhang ; Shengqing Xia ; Zeliang Gao ; Xutang Tao
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：4484-4489
• 全文大小：436K
• ISSN：1528-7505

文摘

Single crystals of the polar material Cs₂TeW₃O₁₂ (CTW) with dimensions up to 26 脳 18 脳 4 mm³ were successfully grown using a top-seeded solution growth method. The morphologies of the as-grown crystals have been described and compared with that obtained from the Bravais鈥揊riedel and Donnay鈥揌arker (BFDH) method. The crystal structure of CTW has been solved for the first time using single-crystal X-ray diffraction: the compound crystallizes in polar hexagonal space group P6₃ (No. 173) with cell parameters a = b = 7.3279(3) 脜, c = 12.4075(5) 脜, Z = 2, and V = 577.00(4) 脜³. Thermal analysis shows that CTW is thermally stable up to 820 掳C, at which it melts incongruently. Further high-resolution X-ray diffraction experiments gave a full-width at half-maximum of the rocking curve of 33鈥? indicating a good crystalline quality for the as-grown crystals. Optical transmittance spectra of CTW show a broad transmission range from 410 to 5310 nm. Powder second-harmonic generation (SHG) measurements with a 1064 nm laser indicates that CTW exhibits a strong SHG efficiency of about 1.5 the one of KTiOPO₄. Polarization measurements indicate that CTW is not ferroelectric; i.e., the polarization is not 鈥渟witchable鈥? In addition, CTW is nonhygroscopic and resistant to diluted HNO₃ aqua-solution.