A New Lanthanum and Calcium Borate La2CaB10O19
A New Lanthanum and Calcium Borate La2CaB10O19
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DOI：
10.1021/cm0003119
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发表时间：
2001-02
影响因子：
8.6
通讯作者：
Yicheng Wu;Jianguo Liu;P. Fu;Junxing Wang;Huyun Zhou;and Guofu Wang;Chuangtian Chen
中科院分区：
文献类型：
--
作者：
Yicheng Wu;Jianguo Liu;P. Fu;Junxing Wang;Huyun Zhou;and Guofu Wang;Chuangtian Chen
合成了一种新的硼酸钙镧，其组成为La_2CaB_（10）O_（19）。单晶已经从接近化学计量组成的熔体中生长出来。该化合物属于单斜晶系，空间群C2，a = 11.043（3）A，B = 6.563（2）A，c = 9.129（2）A，α = γ = 90°，β = 91.47°，每个晶胞有两个分子式单元。晶体结构中含有B5O12双环五硼酸酯基团，它们连接在一起形成一个无限的二维双层。该层几乎垂直于晶体的c轴。La原子位于层中，而Ca原子位于两层之间。La2CaB10O19的光学二次谐波产生效应约为KDP（KH2PO4）的两倍。
A new lanthanum calcium borate with the composition La2CaB10O19 has been synthesized. Single crystals have been grown from a melt close to the stoichiometric composition. The compound crystallizes in the monoclinic system, space group C2, with a = 11.043(3) A, b = 6.563(2) A, c = 9.129(2) A, α = γ = 90°, β = 91.47°, and two formula units per cell. The crystal structure contains B5O12 double-ring pentaborate groups, which are linked together to form an infinite two-dimensional double layer. The layer runs almost perpendicular to the c axis of the crystal. The La atoms are located in layers, while the Ca atoms are located between two layers. La2CaB10O19 exhibits an optical second-harmonic generation effect about twice as large as that of KDP (KH2PO4).