Cs2GeB4O9: a New Second-Order Nonlinear-Optical Crystal

被引：129

作者：

Xu, Xiang ^{[1
]}

Hu, Chun-Li ^{[1
]}

Kong, Fang ^{[1
]}

Zhang, Jian-Han ^{[1
]}

Mao, Jiang-Gao ^{[1
]}

Sun, Junliang ^{[2
]}

机构：

[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Peoples R China

[2] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

来源：

INORGANIC CHEMISTRY | 2013年 / 52卷 / 10期

基金：

中国国家自然科学基金;

关键词：

ALKALINE BERYLLIUM BORATE; BOND-VALENCE PARAMETERS; TEMPLATED BOROGERMANATE; GENERATION; FRAMEWORK; GROWTH; TETRAHEDRA; CHANNELS; LINKAGE; CLUSTER;

D O I：

10.1021/ic302774h

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new alkali-metal borogermanate with noncentrosymmetric structure, namely, Cs2GeB4O9, has been discovered, and a large crystal with dimensions of 20 x 16 x 8 mm(3) has been grown by a high-temperature top-seeded solution method using Cs2O-B2O3 as a flux. The compound crystallizes in the tetragonal space group I (4) over bar with a = b = 6.8063(2) angstrom, c = 9.9523(7) angstrom, V = 461.05(4) angstrom(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 degrees C, and it possesses a short-wavelength absorption edge onset at 198 nm determined by UV-vis 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 x KH2PO4. The preliminary investigation indicates that Cs2GeB4O9 is a new promising second-order nonlinear-optical crystalline material.

引用

页码：5831 / 5837

页数：7

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