کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9801868 1515732 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impedance spectroscopy studies of K2SO4 in the intermediate temperature regime
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Impedance spectroscopy studies of K2SO4 in the intermediate temperature regime
چکیده انگلیسی
Impedance spectroscopy measurements of K2SO4 have been carried out from 5 Hz to 13 MHz over the temperature range 403-782 °C. The plots of corrected imaginary part of permittivity, ε″, and its real part ε′ vs. frequency clearly show a new dielectric relaxation around fmax=1.4×104 Hz at 403 °C, which shifts to higher frequencies (∼1 MHz) as the temperatures increases. The fmax (calculated from the peak position of ε″) vs. reciprocal T shows an activated relaxation process over the temperature range 403-600 °C with activation energy Ea=1.02 eV, which is close to that derived from the dc-conductivity, Eσ=1.15 eV. We suggest that the observed dielectric relaxation could be produced by the K+ jump and SO4− reorientation that cause distortion and change the local lattice polarizability inducing dipoles like KSO4−.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 136, Issues 11–12, December 2005, Pages 601-604
نویسندگان
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