Ferroelectric and dielectric properties of ferrite-ferroelectric ceramic composites
- Faculty of Physics, 'Al. I. Cuza' University of Iasi 700506, Iasi (Romania)
- Faculty of Chemistry, 'Al. I. Cuza' University of Iasi 700506, Iasi, Romania and Dept. Chemistry and Process Engineering, University of Genoa, P-le Kennedy no. 1, I-16129, Genoa (Italy)
- RAMTECH Faculty of Physics, 'Al. I. Cuza' University of Iasi 700506 (Romania)
- Christian Doppler Laboratory for Advanced Ferroic Oxides, Sheffield Hallam University, Howard Street, Sheffield S1 1WB (United Kingdom)
- CNR-ISTEC, Via Granarolo no. 64, I-48018 Faenza (Italy)
Particulate composites of ferrite and ferroelectric phases with xNiFe{sub 2}O{sub 4} (NF) and (1 - x)Pb{sub 0.988}(Zr{sub 0.52}Ti{sub 0.48}){sub 0.976}Nb{sub 0.024}O{sub 3} (where x = 2, 10, 20, 30, 50, 70, and 100 wt. %) were prepared in situ by sol-gel method. The presence of a diphase composition was confirmed by X-ray diffraction while the microstructure of the composites was studied by scanning electron microscopy revealing a good mixing of the two phases and a good densification of the bulk ceramics. The dielectric permittivity shows usual dielectric dispersion behavior with increasing frequency due to Maxwell-Wagner interfacial polarization. AC conductivity measurements made in frequency range 1 Hz-1 MHz suggest that the conduction process is due to mixed polaron hopping. The effect of NF phase concentration on the P-E and M-H hysteresis behavior and dielectric properties of the composites was investigated. At low NF concentration a sharp ferro-paraelectric transition peak can be observed at around 360 Degree-Sign C while for higher NF concentrations a trend to a diffuse phase transition occurs. All the composite samples exhibit typical ferromagnetic hysteresis loops, indicating the presence of ordered magnetic structure.
- OSTI ID:
- 22102277
- Journal Information:
- Journal of Applied Physics, Vol. 113, Issue 7; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERAMICS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FERRITES
FERROELECTRIC MATERIALS
FERROMAGNETIC MATERIALS
HYSTERESIS
LEAD COMPOUNDS
MICROSTRUCTURE
NICKEL COMPOUNDS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PERMITTIVITY
PHASE TRANSFORMATIONS
POLARIZATION
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
TITANIUM COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS