کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1529359 995750 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and dielectric properties of sodium-doped Ba(FeNb)0.5O3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Structure and dielectric properties of sodium-doped Ba(FeNb)0.5O3
چکیده انگلیسی

The lower valence compensation of the Ba1−xNax(Fe0.5Nb0.5)1+x/4O3 (x = 0, 0.01, 0.05, 0.10, and 0.20) system was synthesized using a solid-state reaction, and the characteristics, including phase formation, microstructure and dielectric properties, were also investigated. XRD results indicate that the structure of BFN is cubic and transforms to orthorhombic when the Na+ ion concentration is ≧10 mol%. The SEM results indicate that the grain size of Ba1−xNax(Fe0.5Nb0.5)1+x/4O3 samples increase from x = 0.0 to 0.05, but decrease from 0.1 to 0.2 which is caused by the formation of acceptors NaBa2++′ at the grain boundaries that inhibits grain growth. Large and small grains coexist for Ba(FeNb)0.5O3 doped with 5 mol% Na+ ions. The step-like dielectric relaxor curve obtained for the doping concentration is 10 mol%. The dielectric constant and loss of Ba1−xNax(Fe0.5Nb0.5)1.025O3 ceramics are increased from 2 × 104–105 to 6 × 104–1.3 × 105 and 0.4–1.6 to 0.25 when x is increased from 0.1 to 0.2, respectively. Complex impedance spectroscopy indicated that the orientation and space charge polarization are dominant for the barrier layers Ba1−xNax(Fe0.5Nb0.5)1+x/4O3 dielectric behavior.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 172, Issue 3, 15 September 2010, Pages 300–304
نویسندگان
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