کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7899817 | 1510355 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and dielectric properties of (100â¯ââ¯x)B2O3-(xâ¯/â¯2)Bi2O3-(xâ¯/â¯2)Fe2O3 glasses and glass-ceramic containing BiFeO3 phase
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Glasses of the compositions (100â¯ââ¯x)B2O3-(xâ¯/â¯2)Bi2O3-(xâ¯/â¯2)Fe2O3 with xâ¯=â¯50, 60 and 70 (in mol%) were prepared. The glassy phase of the samples was established by X-ray diffraction (XRD) and Differential thermal analysis (DTA) studies. The formation of the BiFeO3 phase inside the glass matrix (glass-ceramic) by the heat treatment of the sample at xâ¯=â¯60 was identified by XRD, DTA and Fourier transform infrared (FTIR) studies. FTIR results revealed that the glass samples are composed of BO3, BO4, BiO3, BiO6, FeO4 and FeO6 basic structural units. The trends of the glass transition temperature (Tg), density (Ï), molar volume (Vm), oxygen packing fraction (OPD) and theoretical optical basicity (É
th) were discussed in terms of the structural modifications that take place in the glass matrix. The variation of the dielectric constant (Ér), dielectric loss (tan δ) and the ac conductivity of the glass samples cannot be explained on the basis of the distance between iron ions (Ri) only but on the space charge polarization. The dielectric properties of the glass-ceramic were affected by the presence of BiFeO3 phase inside the glass matrix.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 492, 15 July 2018, Pages 41-49
Journal: Journal of Non-Crystalline Solids - Volume 492, 15 July 2018, Pages 41-49
نویسندگان
E.K. Abdel-Khalek, E.A. Mohamed, Shaaban M. Salem, I. Kashif,