کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5413182 1506618 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
X-ray absorption spectroscopy study of solvation and ion-pairing in aqueous gallium bromide solutions at supercritical conditions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
X-ray absorption spectroscopy study of solvation and ion-pairing in aqueous gallium bromide solutions at supercritical conditions
چکیده انگلیسی
X-ray absorption spectroscopy measurements have been performed both at the Ga and Br K-edges on aqueous GaBr3 solutions. The isobaric experiments have been recorded at 30 MPa from ambient temperature to 670 K for two GaBr3 concentrations (0.017 and 0.17 mol/dm3). At room temperature, Ga3+ and Br− ions are fully solvated, surrounded by water O atoms at 1.97 Å (Ga-O) and 3.37 Å (Br-O). When the temperature is elevated, Ga3+ cations precipitate as gallium oxy-hydroxide colloids while Br− anions remain solvated. With a further increase in temperature, the gallium solid precipitates remarkably re-dissolved (25% and 50% for 0.017 and 0.17 mol/dm3 respectively), due to the formation of [GaBrn(H2O)4 − n](aq)3 − n (n = 2, 3 or 4) tetrahedral complexes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 147, Issues 1–2, 20 July 2009, Pages 83-95
نویسندگان
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