کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7900123 | 1510363 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ionic conductivity of lithium borate glasses and local structure probed by high resolution solid-sate NMR
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Structural properties and ionic conductivity have been correlated in the XLi2O-(100â¯ââ¯X)B2O3 vitreous system over a wide range of composition (Xâ¯=â¯0-50â¯mol%). The structural evolution of the vitreous network as a function of the lithium oxide content was established at ambient temperature by 11B and 7Li high resolution solid state NMR, while electrical conductivity has been measured by complex impedance spectroscopy from room temperature up to the glass transition temperature Tg. The 11B NMR spectra indicate that starting from pure boron trioxide glass, the addition of alkali leads to a gradual transformation of BO3 units into BO4â. From Xâ¯ââ¯30, the increase of Li+ content is also accompanied by the formation of Non-Bridging Oxygen (NBO). These specific structural changes have been used to interpret the conductive behavior of vitreous lithium borates. Indeed, measured on a wide range of composition, the direct conductivity (Ïdc) increases with the Li2O content and exhibits a clear regime change at Xâ¯ââ¯32, which can be correlated to the interaction of cations with BO4â units and NBO.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 484, 15 March 2018, Pages 57-64
Journal: Journal of Non-Crystalline Solids - Volume 484, 15 March 2018, Pages 57-64
نویسندگان
Valerie Montouillout, Hua Fan, Leire del Campo, Sandra Ory, Aydar Rakhmatullin, Franck Fayon, Mohammed Malki,