1. Crystal structures and second-order NLO properties of borogermanates
- Author
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Zhang, Jian-Han, Kong, Fang, Xu, Xiang, and Mao, Jiang-Gao
- Subjects
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CRYSTAL structure , *BORON compounds , *NONLINEAR optics , *POROUS materials , *ALKALINE earth metals , *ZEOLITES , *SECOND harmonic generation - Abstract
Abstract: Borogermanates are a class of very important compounds in materials chemistry. In this paper, the syntheses, structures, and properties of metal borogermanates are reviewed. Organically templated borogermanates with zeolite-like open-frameworks show potential applications as microporous materials. Many compounds in alkali or alkaline-earth borogermanate systems are structurally acentric or polar, some of which exhibit excellent Second Harmonic Generation (SHG) coefficients, wide transparency regions, and high optical-damage thresholds as well as excellent thermal stability. Most of the lanthanide borogermanates are structurally centrosymmetric and not SHG active; however, they are able to emit strong luminescence in visible or near-IR region. In the B-rich compounds, BO3 and BO4 groups can be polymerized into a variety of discrete polynuclear anionic cluster units or extended architectures via B–O–B bridges; whereas in the Ge-rich compounds, GeO4 and GeO6 polyhedra can also be polymerized. The combinations of borate and germinate afforded rich structural and topological types. [Copyright &y& Elsevier]
- Published
- 2012
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