کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10638307 995415 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Bi2O3 content on the optical band gap, density and electrical conductivity of MO·Bi2O3·B2O3 (M = Ba, Sr) glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Effect of Bi2O3 content on the optical band gap, density and electrical conductivity of MO·Bi2O3·B2O3 (M = Ba, Sr) glasses
چکیده انگلیسی
Glasses with compositions 20MO·xBi2O3·(80−x)B2O3 (M = Ba, Sr) with 10 ≤ x ≤ 60 (in mol%) have been prepared using the normal melt-quench technique. The optical absorption spectra of the glasses have been recorded in the wavelength range 400-700 nm. The fundamental absorption edge has been identified from the optical absorption spectra. The values of optical band gap for indirect allowed and indirect forbidden transitions have been determined using available theories. The origin of the Urbach energy is associated with the phonon-assisted indirect transitions. The density and molar volume studies indicate that Bi2O3 in these glasses is acting partly as network modifier and partly as network former. Values of the direct-current electrical conductivity have been measured from 373 to 623 K and the activation energy has been calculated. The variations in optical band gap, density and electrical conductivity with Bi2O3 content have been discussed in terms of changes in the glass structure. Values of the theoretical optical basicity are also reported.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 90, Issue 1, 15 March 2005, Pages 83-89
نویسندگان
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