Cs2GeB4O9: a New Second-Order Nonlinear-Optical Crystal

详细信息    查看全文

• 作者：Xiang Xu ; Chun-Li Hu ; Fang Kong ; Jian-Han Zhang ; Jiang-Gao Mao ; Junliang Sun
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 20, 2013
• 年：2013
• 卷：52
• 期：10
• 页码：5831-5837
• 全文大小：384K
• 年卷期：v.52,no.10(May 20, 2013)
• ISSN：1520-510X

文摘

A new alkali-metal borogermanate with noncentrosymmetric structure, namely, Cs₂GeB₄O₉, has been discovered, and a large crystal with dimensions of 20 脳 16 脳 8 mm³ has been grown by a high-temperature top-seeded solution method using Cs₂O鈥揃₂O₃ as a flux. The compound crystallizes in the tetragonal space group I4̅ with a = b = 6.8063(2) 脜, c = 9.9523(7) 脜, V = 461.05(4) 脜³, and Z = 2. It features a three-dimensional anionic open framework based on GeO₄ tetrahedra and B₄O₉ clusters that are interconnected via corner-sharing, forming one-dimensional channels of nine-/ten-membered rings along the a and b axes, which are occupied by Cs⁺ cations. Cs₂GeB₄O₉ exhibits a very high thermal stability with a melting point of 849 掳C, and it possesses a short-wavelength absorption edge onset at 198 nm determined by UV鈥搗is transmission spectroscopy measurements on a slab of polished crystal. Powder second-harmonic generation (SHG) measurement on sieved crystals reveals that Cs₂GeB₄O₉ is a type I phase-matchable material with a strong SHG response of about 2.8 脳 KH₂PO₄. The preliminary investigation indicates that Cs₂GeB₄O₉ is a new promising second-order nonlinear-optical crystalline material.