skip to main content

Title: Enhancement in the multiferroic properties of BiFeO{sub 3} by charge compensated aliovalent substitution of Ba and Nb

Polycrystalline ceramics, Bi{sub 1-2x}Ba{sub 2x}Fe{sub 1-x}Nb{sub x}O{sub 3} (x = 0.00–0.15), were synthesized by solid state reactions method. X-ray diffraction data have revealed elimination of impurity phases and an increase in unit cell volume with Ba and Nb substitution. Diffraction peak splitting is found to be suppressed which indicates a decrease in octahedral distortion. The Mössbauer spectra demonstrate the suppression of spiral spin modulation of the magnetic moments resulting in enhanced ferromagnetism with increasing dopant concentration. The leakage current density of the sample with x = 0.10 is found to be greatly reduced up to six orders of magnitude as compared to the undoped sample. Ohmic conduction is found to be dominant mechanism in all the samples, however, undoped sample showed space charge limited conduction in high electric filed region, while the sample with x = 0.15 exhibited grain boundary limited conduction in low electric field region.
Authors:
; ;  [1] ; ; ;  [2]
  1. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences Nilore, Islamabad (Pakistan)
  2. Physics Division, PINSTECH, P.O. Nilore, Islamabad (Pakistan)
Publication Date:
OSTI Identifier:
22250845
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 3; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; DENSITY; ELECTRIC FIELDS; FERROMAGNETISM; GRAIN BOUNDARIES; IMPURITIES; LEAKAGE CURRENT; MAGNETIC MOMENTS; POLYCRYSTALS; SOLIDS; SPACE CHARGE; SPECTRA; X-RAY DIFFRACTION