کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484832 1510531 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electronic conductivity in zinc iron phosphate glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Electronic conductivity in zinc iron phosphate glasses
چکیده انگلیسی

The electrical properties of (40−x)ZnO–xFe2O3–60P2O5 (x = 10, 20, 30 mol%) glasses were measured by impedance spectroscopy in the frequency from 0.01 Hz to 4 MHz and the temperature range from 303 to 473 K. It was shown that the dc conductivity strongly depends on the Fe2O3 content and Fe(II)/Fetot ratio. The increase in dc conductivity for these glasses is attributed to the increase in Fe2O3 content from 10 to 30 mol%. With increasing Fe(II) ion content from 6% to 17% the dc conductivity increases. This indicated that the conductivity arises mainly from polaron hopping between Fe(II) and Fe(III) ions suggesting an electron conduction in these glasses. By applying scaling on conductivity data measured at different temperatures, single master curve was obtained for each glass. On the other hand, deviation from the master curve at high frequencies was observed for glasses with different compositions. This deviation originates from a various mobility of charge carriers in different glass structures. Raman spectra showed the change of structure, from metaphosphate to pyrophosphate, with increasing Fe2O3 content from 10 to 30 mol%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 353, Issues 47–51, 1 December 2007, Pages 4395–4399
نویسندگان
, , , ,