Structural, magnetic and impedance spectroscopy analysis of (0.7)CoFe2O4+(0.3)BaTiO3 magnetoelectric composite

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.07.026· OSTI ID:22805296

Nadeem, M. ^[1]; Khalid, W.; Ali, Z. ^[2]

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1. Polymer Composite Group, Physics Division, Directorate of Science, PINSTECH, P.O. Nilore, Islamabad (Pakistan)
2. Functional Materials Lab, Department of Physics, Air University, PAF Complex E-9, Islamabad (Pakistan)

Highlights: • Successfully synthesized (0.7)CoFe{sub 2}O{sub 4}+(0.3)BaTiO{sub 3} composite by ball-milling method. • Structural properties confirmed the presence of both constituent phases. • Dielectric properties showed high value of permittivity and diminished dielectric loss at higher frequency. • Electric response of the constituent phases explained the observed relaxation processes. • Small polaron hopping mechanism governed the conduction mechanism. - Abstract: Magnetoelectric composite of particular composition (0.7)CoFe{sub 2}O{sub 4}+(0.3)BaTiO{sub 3} was synthesized by ball-milling method. X-ray diffraction pattern confirmed the presence of cubic spinel phase for CoFe{sub 2}O{sub 4} and the coexistence of tetragonal phase along with a small fraction of hexagonal phase for BaTiO{sub 3} in the prepared composite. The dielectric permittivity increased with increasing temperature (298–373 K); however, it showed relatively high magnitude of permittivity (∼1100) and diminished dielectric loss (∼0.045) at higher frequency. Complex impedance and modulus plots exhibited responses of different electro-active regions which are explained on the basis of coexistence of resistive and comparatively conductive phases in the prepared composite. Small polaronic hopping model was employed to explain the n-type carrier’s mobility as a possible conduction mechanism; whereas the activation energies calculated from the conduction and relaxation processes were found to be comparable. These results indicate that electric/dielectric properties and relaxation phenomenon are associated to the same origin.

• OSTI ID: 22805296
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 107; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
BARIUM COMPOUNDS
CARRIER MOBILITY
COBALT COMPOUNDS
COMPOSITE MATERIALS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
FERRITES
MAGNETIC PROPERTIES
MICROSTRUCTURE
MILLING
POLARONS
SPECTROSCOPY
SPINELS
TITANATES
X-RAY DIFFRACTION