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

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.
Authors:
;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22271115
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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