Multiferroic behavior in composites of nickel-exchanged glass containing nanoparticles of barium titanate

R. Venkata Ram Naidu, Partha Hajra, Anindya Datta, Santanu Bhattacharya, Dipankar Chakravorty

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A multiferroic material has been synthesized by first growing BaTiO 3 nanocrystals in a silica glass and then subjecting the composite to a two-stage ion-exchange reaction of the type Ti4+↔2Ni 2+. The nanocomposite retained the usual ferroelectric characteristics with lower values of the dielectric constant and remanent polarization. It also showed ferromagnetic hysteresis at temperatures in the range 10-300 K. At temperatures below ∼10 K, the magnetization exhibited a sharp increase as the temperature was reduced. This has been explained on the basis of a one-dimensional Heisenberg ferromagnet consisting of Ni2+ ions at the surfaces of the nanocrystals. The nanocomposite showed magnetodielectric coupling at room temperature. The dielectric constant increased as a function of magnetic field, showing a maximum at 4 kOe. This has been ascribed to magnetostriction of the new BaTiO3 nanocrystalline phase.

Original languageEnglish (US)
Pages (from-to)3006-3011
Number of pages6
JournalJournal of the American Ceramic Society
Volume94
Issue number9
DOIs
StatePublished - Sep 2011

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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