Structure of Supersaturated Aqueous Sodium Pentaborate Solution

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	Structure of Supersaturated Aqueous Sodium Pentaborate Solution
	Zhou Yong-Quan1,2 ; Fang Chun-Hui1 ; Fang Yan1
	2010-09-01
发表期刊	ACTA PHYSICO-CHIMICA SINICA
ISSN	1000-6818
卷号	26 期号:9 页码:2323-2330
关键词	Solution Structure X-ray Diffraction Sodium Pentaborate Supersaturated Aqueous Solution Radial Distribution Function Polyborate Anion
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 (B3O3(OH)(4)(-), B5O6(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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1903
专题	青海盐湖研究所知识仓储
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Zhou Yong-Quan,Fang Chun-Hui,&Fang Yan.(2010).Structure of Supersaturated Aqueous Sodium Pentaborate Solution.ACTA PHYSICO-CHIMICA SINICA,26(9),2323-2330.
MLA	Zhou Yong-Quan,et al."Structure of Supersaturated Aqueous Sodium Pentaborate Solution".ACTA PHYSICO-CHIMICA SINICA 26.9(2010):2323-2330.