کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1616914 1005672 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase pure synthesis of BiFeO3 nanopowders using diverse precursor via co-precipitation method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Phase pure synthesis of BiFeO3 nanopowders using diverse precursor via co-precipitation method
چکیده انگلیسی

Amorphous powder of BiFeO3 (BFO) was synthesized at low-temperature (80 °C) by co-precipitation method. Optimal synthesis conditions for phase pure BFO were obtained. Powders were calcined in the temperature range from 400 to 600 °C for 1 h. Iso-statically pressed powder was sintered at 500 °C for 2 h. Differential scanning calorimetric thermo-gram guided for phase transition, crystallization and melting temperatures. X-ray diffraction confirmed the amorphous nature of as synthesized powder and phase formation of calcined powders. Calcination at temperature ≥400 °C resulted in nano crystalline powders with perovskite structure. Average crystallite size increased with the increase in calcination temperature. Scanning electron microscopic studies revealed dense granular microstructure of the sintered samples. The sintered samples exhibited high dc resistivity at room temperature which decreased with the increase in temperature. Dielectric constant, dielectric loss tangent and ac conductivity measurements were carried out in the frequency range (10 Hz to 2 MHz). The samples responded weak electric and magnetic polarization at room temperature with unsaturated and hysteresis free loops, respectively.


► Synthesized phase pure BiFeO3 using diverse precursor by co-precipitation method.
► Optimized synthesis and processing parameters.
► Thermal behavior, structure and microstructure were analyzed.
► Resistivity vs temperature and dielectric constant vs frequency were measured.
► Multiferroicity at room temperature was confirmed by M–H and P–E loops.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 41, 13 October 2011, Pages 10139–10144
نویسندگان
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