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题名: Structure of Supersaturated Aqueous Sodium Pentaborate Solution
作者: 周永全 ;  房春晖 ;  房艳
刊名: ACTA PHYSICO-CHIMICA SINICA
出版日期: 2010
卷号: 26, 期号:9, 页码:2323-2330
英文摘要: We determined the time-averaged and space-averaged structures of supersaturated aqueous sodium pentaborate solutions by rapid liquid X-ray diffractometry at 298 and 323 K. Difference radial distribution functions (DRDF) and their theoretical partial radial distribution functions for B-B, B-O, O-O, Na-O and Na-B atom pairs were obtained from accurate diffraction data. The effects of concentration and temperature on the structure of the solutions were also discussed. Three main species (B(3)O(3)(OH)(4)(-), B(5)O(6)(OH)(4)(-) and B(OH)(3)) were found to exist in supersaturated aqueous sodium pentaborate solutions and their hydrated structures were determined by model design and quantitative calculations. Higher temperature and higher concentration result in higher polyborates. As the concentration decreases, interaction distances and the average coordination number of the octahedral hexahydrated Na(+) ion hardly changes while the hydration number of the polyborate increases. In concentrated solutions, the terminal-oxygen of the polyborates connects with the hydrated Na(+) in a monodentate form to produce a contact ion pair with a characteristic distance of 0.328 nm. We determined the time-averaged and space-averaged structures of supersaturated aqueous sodium pentaborate solutions by rapid liquid X-ray diffractometry at 298 and 323 K. Difference radial distribution functions (DRDF) and their theoretical partial radial distribution functions for B-B, B-O, O-O, Na-O and Na-B atom pairs were obtained from accurate diffraction data. The effects of concentration and temperature on the structure of the solutions were also discussed. Three main species (B(3)O(3)(OH)(4)(-), B(5)O(6)(OH)(4)(-) and B(OH)(3)) were found to exist in supersaturated aqueous sodium pentaborate solutions and their hydrated structures were determined by model design and quantitative calculations. Higher temperature and higher concentration result in higher polyborates. As the concentration decreases, interaction distances and the average coordination number of the octahedral hexahydrated Na(+) ion hardly changes while the hydration number of the polyborate increases. In concentrated solutions, the terminal-oxygen of the polyborates connects with the hydrated Na(+) in a monodentate form to produce a contact ion pair with a characteristic distance of 0.328 nm.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/1903
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
Zhou Yong-Quan,Fang Chun-Hui,Fang Yan. Structure of Supersaturated Aqueous Sodium Pentaborate Solution[J]. ACTA PHYSICO-CHIMICA SINICA,2010,26(9):2323-2330.
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