کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1527500 995389 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric properties and physical features of phosphate glasses containing iron oxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Dielectric properties and physical features of phosphate glasses containing iron oxide
چکیده انگلیسی

Microwave techniques were applied to the study of dielectric properties of phosphate glasses on the basis of contributions from permanent and induced dipolar polarization of local structural units interacting with the electrical component of the electromagnetic radiation. The dielectric constant of the selected glass system (100 − x)(50P2O5·25Li2O·25Na2O)·xFe2O3, where 0 ≤ x ≤ 21 is in mol%, was measured using a microwave setup assembled to measure the phase shift of the standing wave pattern produced by the insertion of the sample. It is shown that the Fe2+ ions contribute effectively to the dielectric constant, as expected from the interactions of the dipoles of the local charge compensation pairs with the microwave radiation. However, there is the possibility of occurrence of some ions Fe3+, in general, at low iron content, which reinforces the glass structure and, therefore, decreases the dielectric constant. There is a gradual conversion from Fe3+ to Fe2+ as the iron ions increases. This is possibly the reason of the anomaly in the dielectric constant values observed in the results. These assumptions can be checked by results of electronic paramagnetic resonance (EPR) and optical absorption (OA). The dielectric constant of the glasses studied in this work was found to increase with the temperature in the range of 25–330 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 108, Issue 1, 15 March 2008, Pages 142–146
نویسندگان
, , ,