Anisotropic Thermal Properties of the Nonlinear Optical and Polar Oxide Material Na2TeW2O9

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• 作者：Weiguo Zhang ; P. Shiv Halasyamani ; Zeliang Gao ; Shanpeng Wang ; Jian Wang ; Xutang Tao
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：August 3, 2011
• 年：2011
• 卷：11
• 期：8
• 页码：3636-3641
• 全文大小：946K
• 年卷期：v.11,no.8(August 3, 2011)
• ISSN：1528-7505

文摘

Centimeter size crystals of the second-order nonlinear optical and polar oxide Na₂TeW₂O₉ (NTW) have been grown by the top-seeded solution growth method. The specific heat, anisotropic thermal expansion, and thermal diffusivity have been measured. In addition, the average principal thermal expansion coefficients have been calculated on the basis of measurements between 23 and 500 掳C. NTW exhibits strongly anisotropic thermal expansion that can be attributed to its low symmetry, monoclinic, in space group Ia. The relationships between the structure and thermal properties are discussed.