Na4La2(CO3)5 and CsNa5Ca5(CO3)8: Two New Carbonates as UV Nonlinear Optical Materials

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• 作者：Min Luo ; GenXiang Wang ; Chensheng Lin ; Ning Ye ; Yuqiao Zhou ; Wendan Cheng
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 4, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：8098-8104
• 全文大小：442K
• ISSN：1520-510X

文摘

Two nonlinear optical crystal carbonates (Na₄La₂(CO₃)₅ and CsNa₅Ca₅(CO₃)₈ were successfully synthesized by hydrothermal method, and both of them crystallized in the same noncentrosymmetric hexagonal space group P63mc (No. 186). The structure of Na₄La₂(CO₃)₅ consists of a three-dimensional network made up of [CO₃] triangles as well as irregular [Na_0.67La_0.33O₁₀] and [NaO₈] polyhedra. The structure of CsNa₅Ca₅(CO₃)₈ can be described as the standing-on-edge [CO₃] groups connect the adjacent infinite [CaCO₃]_{鈭?/sub> layers in the ab plane to construct a framework with four types of channels running parallel to [010]. The Na, Cs, and [Na0.67Ca0.33] atoms reside in these channels. The measurement of second harmonic generation (SHG) by the method adapted from Kurtz and Perry indicated that Na4La2(CO3)5 and CsNa5Ca5(CO3)8 were phase-matchable in the visible region and exhibited SHG responses of approximately 3 and 1 脳 KH2PO4 (KDP). Meanwhile, they exhibited wide transparent region with short UV cutoff edge at about 235 and 210 nm, respectively, suggesting that these crystals as NLO materials may have potential applications in the UV region.}