کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7899445 1510167 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electronic and ionic conductivity studies on microwave synthesized glasses containing transition metal ions
ترجمه فارسی عنوان
مطالعات الکترونی و هدایت یونی در عینک سنتز مایکروویو حاوی یونهای فلز انتقالی است
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
Glasses in the system xV2O5·20Li2O·(80 − x) [0.6B2O3:0.4ZnO] (where 10 ≤ x ≤ 50) have been prepared by a simple microwave method. Microwave synthesis of materials offers advantages of efficient transformation of energy throughout the volume in an effectively short time. Conductivity in these glasses was controlled by the concentration of transition metal ion (TMI). The dc conductivity follows Arrhenius law and the activation energies determined by regression analysis varies with the content of V2O5 in a non-linear passion. This non-linearity is due to different conduction mechanisms operating in the investigated glasses. Impedance and electron paramagnetic resonance (EPR) spectroscopic studies were performed to elucidate the nature of conduction mechanism. Cole-cole plots of the investigated glasses consist of (i) single semicircle with a low frequency spur, (ii) two depressed semicircles and (iii) single semicircle without spur, which suggests the operation of two conduction mechanisms. EPR spectra reveal the existence of electronic conduction between aliovalent vanadium sites. Further, in highly modified (10V2O5 mol%) glasses Li+ ion migration dominates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Research and Technology - Volume 6, Issue 1, January–March 2017, Pages 7-12
نویسندگان
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