A New Lanthanum and Calcium Borate La2CaB10O19
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- 作者：Yicheng Wu ; Jianguo Liu ; Peizhen Fu ; Junxing Wang ; Huyun Zhou ; Guofu Wang ; and Chuangtian Chen
- 刊名：Chemistry of Materials
- 出版年：2001
- 出版时间：March 2001
- 年：2001
- 卷：13
- 期：3
- 页码：753 - 755
- 全文大小：109K
- 年卷期：v.13,no.3(March 2001)
- ISSN：1520-5002
文摘
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. Thecompound crystallizes in the monoclinic system, space group C2, with a = 11.043(3) Å, b =6.563(2) Å, c = 9.129(2) Å, 
= 
= 90
, 
= 91.47, and two formula units per cell. Thecrystal structure contains B5O12 double-ring pentaborate groups, which are linked togetherto form an infinite two-dimensional double layer. The layer runs almost perpendicular tothe c axis of the crystal. The La atoms are located in layers, while the Ca atoms are locatedbetween two layers. La2CaB10O19 exhibits an optical second-harmonic generation effect abouttwice as large as that of KDP (KH2PO4).
= = 90, = 91.47, and two formula units per cell. Thecrystal structure contains B5O12 double-ring pentaborate groups, which are linked togetherto form an infinite two-dimensional double layer. The layer runs almost perpendicular tothe c axis of the crystal. The La atoms are located in layers, while the Ca atoms are locatedbetween two layers. La2CaB10O19 exhibits an optical second-harmonic generation effect abouttwice as large as that of KDP (KH2PO4).