کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10714247 | 1025576 | 2011 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of La substitution on conductivity and dielectric properties of Bi1âxLaxFeO3 ceramics: An impedance spectroscopy analysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Bismuth ferrite (BFO) and La-substituted BFO with composition Bi1âxLaxFeO3 (x=0.05, 0.1 and 0.15) (BLFOx=0.05-0.15) ceramics were prepared using the solid state reaction route. A structural phase transition from rhombohedral phase to triclinic phase was observed for BLFOx=0.05-0.15 ceramics. Modulus spectroscopy reveals the deviation of dielectric behavior from ideal Debye characteristics and the dependence of conductivity on ion hopping in BFO and BLFOx=0.05-0.15 ceramics. The conductivity of the BFO ceramics decreases for La content of 5Â mol%, followed by a subsequent increase with 10 and 15Â mol% of lanthanum doping. The typical values of the activation energies at high temperature reveal the contribution of short range movement of doubly ionized oxygen vacancies to the conduction process in BFO and BLFOx=0.05 ceramics. Both short range and long range motion of oxygen vacancies are responsible for large conductivity in BLFOx=0.1 and 0.15 ceramics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 406, Issue 13, 1 July 2011, Pages 2669-2677
Journal: Physica B: Condensed Matter - Volume 406, Issue 13, 1 July 2011, Pages 2669-2677
نویسندگان
Pragya Pandit, S. Satapathy, P.K. Gupta,