C. Fang, F. Zhu, Y. Fang
Mar 1, 2013
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Journal
Physics and Chemistry of Liquids
Abstract
The borate species in aqueous potassium tetraborate solution were obtained according to the chemical species distribution diagram and the Raman spectrum. X-ray scattering is used to study the solutions with salt–water molar ratios of 1 : 25, 1 : 20 and 1 : 15 at 298 and 323 K. The model calculation and model refinement programmes are used to calculate the structure parameters r i−j , b i−j and n i−j . It manifests that the first hydration distance of K+ is ∼0.29 nm, with an average hydrated number of 8.0. The hydration bond peak is around 0.278 nm and the coordination number is from 1.9 to 2.4. Borate anions coordinate with K+ ions in the mono-dentate form, the average distance of K–B is 0.38 nm. The distance of B–H2O in hydrated anion is from 0.37 to 0.38 nm with the hydrated number 4–9. The other interaction such as water shared pair interaction is also discussed.