کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1517200 1511603 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
IR and Raman investigation on the structure of (100-x)B2O3-x[0.5 BaO–0.5 ZnO] glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
IR and Raman investigation on the structure of (100-x)B2O3-x[0.5 BaO–0.5 ZnO] glasses
چکیده انگلیسی

Glasses with molar composition of (100-x)B2O3-x[0.5 BaO–0.5 ZnO], x=40, 50, 60, 70 were prepared from the melts of ZnO, BaCO3 and H3BO3 mixture. The structure and thermal behavior were characterized by IR and Raman spectroscopy, DSC and Dilatometer. The investigation shows that the transition of the structural unit [BO4] (BIV) to [BO3] (BIII) happens when BaO and ZnO content x increases in the borate glass, resulting in fewer BIII–O–BIV bonds and more BIII–O–BIII bonds. At the same time, the diborate groups, which are found to be the predominant structural group of the glass with high B2O3 content, gradually changes into ring-type metaborate, pyro- and orthoborate groups. With increasing ZnO and BaO content x, the glass transition temperature (Tg) and the softening point (Tf) decreases, while linear expansion coefficient (α) increases, that comes from the weakening of the glass network.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 69, Issue 10, October 2008, Pages 2499–2502
نویسندگان
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