کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1516929 1511600 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasonic studies on alkali borate tungstate glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Ultrasonic studies on alkali borate tungstate glasses
چکیده انگلیسی

Longitudinal and shear ultrasonic wave velocities have been measured in different compositions of the glass system 20Li2O–(80−x)B2O3–xWO3 (0⩽x⩽12.5 mol%), at room temperature and at 4 MHz frequency. Elastic moduli, Debye temperature and Poisson's ratio have been obtained as a function of WO3 content. Based on FTIR spectroscopy and theoretical bond compression model, quantitative analysis has been carried out in order to obtain more information about the structure of these glasses. The longitudinal ultrasonic wave velocity measurements showed a bend at about 2.5 mol% WO3 content while shear ultrasonic wave velocity decreased monotonously with an increase of WO3 content. Elastic moduli values decreased as WO3 content increased from 0 to 2.5 mol%. Further increase of WO3 beyond 2.5 mol% increased the elastic moduli values. It is suggested that these behaviours are mainly due to the presence of WO3 in the network structure of these glasses as a network modifier when WO3 content is between 0 and 2.5 mol%, and acts as a network former above 2.5 mol%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 70, Issue 1, January 2009, Pages 173–179
نویسندگان
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