کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1411698 1501875 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Infrared and MAS NMR studies of potassium borovanadate glasses
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Infrared and MAS NMR studies of potassium borovanadate glasses
چکیده انگلیسی

Glass system of the composition xK2O(90 − x)B2O310V2O5 (where x = 10, 20, 30, 40, and 50 mol%) have been prepared by melt quenching technique and characterized for their densities, and glass transition temperatures. The structure of the glasses has been investigated using infrared and magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The structural changes occur due to the addition of modifier oxide. Modification is based on the Sanderson’s electronegativity principle, leading to the formation of [B2V2O9]2− (type I and type II), [BO4/2]− and [BO2/2O]−. This is followed by a structural rearrangement that is the ratio of B4/B4 + B3 = N4 increases up to 40 K2O mol%, further increase in modifier oxide concentration levels off N4. The nature of speciation is examined using structural model. The variation of different properties is consistent with this model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 889, Issues 1–3, 29 October 2008, Pages 197–203
نویسندگان
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