Tuning the multiferroic properties of Pb(Fe1/2Nb 1/2)O3 by cationic substitution

V. V. Bhat, K. V. Ramanujachary, S. E. Lofland, A. M. Umarji

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37 Scopus citations

Abstract

A series of substituted lead iron niobate compounds with the general formula Pb2+(1-x)AZx(Fe {(1-(2-Z)x)/2}Nb{(1+(2-Z)x)/2})O3 (0<x<0.6 and A=La3+, K+ or Sr2+) were prepared by a modified solid-state synthesis. The relative concentrations of Fe3+ and Nb5+ were adjusted to compensate the charge imbalance due to the aliovalent substitution. The dielectric constant and magnetic susceptibilities were studied as a function of temperature. The temperature of the dielectric maximum, TM, of the substituted compounds decreased linearly with increasing concentration of the substituent ions. The magnetic measurements showed an antiferromagnetic transition at temperatures TN1 due to the superexchange interactions mediated by Fe-O-Fe and an additional antiferromagnetic-type transition at TN2. TN1 linearly increased with the increasing concentration of Fe 3+ ion at the B-site of ABO3-type substituted compounds. TM is shown to be directly dependent on the concentration of the ferroactive Nb5+ ions at the B-site and Pb2+ ions at the A-site.

Original languageEnglish (US)
Pages (from-to)221-226
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume280
Issue number2-3
DOIs
StatePublished - Sep 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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