کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1492473 992384 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
AC conductivity and dielectric relaxation in CaMg1/3Nb2/3O3CaMg1/3Nb2/3O3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
AC conductivity and dielectric relaxation in CaMg1/3Nb2/3O3CaMg1/3Nb2/3O3
چکیده انگلیسی

The complex perovskite oxide calcium magnesium niobate, CaMg1/3Nb2/3O3CaMg1/3Nb2/3O3 (CMN) is synthesized by a solid-state reaction technique. Dielectric spectroscopy is applied to investigate the electrical properties of CMN in a temperature range from room temperature to 503 K and in a frequency range of 100 Hz–1 MHz. An analysis of the dielectric constant ϵ′ϵ′ and loss tangent tan⁡δtan⁡δ with frequency is performed assuming a distribution of relaxation times. The low-frequency dielectric dispersion corresponds to the DC electrical conductivity. The frequency dependence of the loss peak is found to obey an Arrhenius law with an activation energy of 1.8 eV. The frequency dependent electrical data are analyzed in the framework of the conductivity and modulus formalisms. Both these formalisms show qualitative similarities in relaxation times. The scaling behaviour of imaginary part of electric modulus M″M″ suggests that the relaxation describes the same mechanism at various temperatures in CMN.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 43, Issue 5, 6 May 2008, Pages 1246–1254
نویسندگان
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