Large-Sized Crystal Growth and Electric-Elastic Properties of 伪-BaTeMo2O9 Single Crystal

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• 作者：Zeliang Gao ; Xiangxin Tian ; Junjie Zhang ; Qian Wu ; Qingming Lu ; Xutang Tao
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：February 4, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：759-763
• 全文大小：281K
• ISSN：1528-7505

文摘

Bulk crystal of 伪-BaTeMo₂O₉ with dimensions up to 90 脳 38 脳 27 mm³ was grown successfully by a top-seeded solution growth method. In the crystal growth process, a low cooling rate (0.1鈥?.5 掳C/day) and dynamic adjustment of rotating speed were adopted in order to stabilize the metastable growth and improve the crystal quality. The crystal facets {002}, {010}, {201虆}, {111} are in good accordance with the predicted growth morphology based on the Bravais鈥揊riedel and Donnay鈥揌arker method. The complete sets of the dielectric, elastic, and piezoelectric constants of the 伪-BaTeMo₂O₉ crystals have been determined by means of the resonant technique and impedance analysis at room temperature. The results show that the 伪-BaTeMo₂O₉ crystal possesses much smaller piezoelectric constants (d₃₁ = 鈭?.8 pm/V, d₁₅ = 4.9 pm/V, and d₃₁ = 0.3 pm/V) than that of 尾-BaTeMo₂O₉. In addition, the structural distortions and dipole moments of 伪-BaTeMo₂O₉ and 尾-BaTeMo₂O₉ were analyzed and calculated to explain the obvious differences upon the properties between the two crystals.