Enhanced magnetization and improved insulating character in Eu substituted BiFeO{sub 3}

Journal Article · Fri Mar 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4869775· OSTI ID:22271115

Durga Rao, T.; Asthana, Saket ^[1]; Ranjith, R. ^[2]

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1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, Andhra Pradesh–502205 (India)
2. Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Andhra Pradesh–502205 (India)

The polycrystalline Bi{sub 1−x}Eu{sub x}FeO{sub 3} (x = 0, 0.05, and 0.1) ceramics were synthesized by conventional solid-state route. X-ray diffraction studies and Raman measurements revealed that the compounds crystallized in rhombohedral structure with R3c space group. In addition, a nominal percentage of orthorhombic phase was observed in 10 mol. % Eu substituted BiFeO{sub 3}. Appearance of weak ferromagnetism and significant increase in Néel temperature T{sub N} in the substituted compounds were discussed on the basis of structural distortions. Enhanced remnant magnetization of 75 memu/g and large coercive field of 6.4 kÖe were observed in 10 mol. % Eu substituted BiFeO{sub 3}. Equivalent circuit model was employed to estimate the grain and grain boundary contributions towards the electrical parameters such as resistance and conductivity. Non-Debye type of relaxation was confirmed from impedance and electric modulus studies. The obtained frequency variation of ac conductivity at different temperature obeys Jonscher's power law and is consistent with the correlated barrier hopping model. Temperature variations of ac conductivity explained that electronic hopping, oxygen vacancies movement, and/or creation of defects contribute to conduction in all the compounds.

• OSTI ID: 22271115
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CERAMICS
CONCENTRATION RATIO
ELECTRIC CONDUCTIVITY
EUROPIUM COMPOUNDS
FERRITES
FERROMAGNETISM
GRAIN BOUNDARIES
IMPEDANCE
MAGNETIZATION
ORTHORHOMBIC LATTICES
OXYGEN
POLYCRYSTALS
TEMPERATURE DEPENDENCE
TRIGONAL LATTICES
VACANCIES
X-RAY DIFFRACTION