Multiferroic behavior in silicate glass nanocomposite having a core-shell microstructure

R. P. Maiti, S. Basu, Santanu Bhattacharya, D. Chakravorty

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Nanosized iron core and barium titanate shell microstructure was generated within a silicate glass of composition 23.1 Na2O, 23.1 BaO, 23.0 TiO2, 7.6 B2O3, 5.8 Fe2O3, 17.4 SiO2 by first reducing it at 893 K for 1/2 h and then subjecting it to heat treatment at 759 K for 4 h. Transmission electron microscopy showed the composite particles to have a mean diameter of 3.9 nm. The nanocomposite exhibited both ferroelectric and ferromagnetic behavior. The dielectric constant peak was not prominent because of a small thickness of the barium titanate phase. The magnetic hysteresis loop showed an asymmetric behavior giving rise to a small exchange bias field. This is believed to arise due to exchange interaction between the ferromagnetic iron core and the thin layer of Fe3O4 on the core surface with a spin glass-like behavior. The magnetization under zero-field cooled (ZFC) and field cooled (FC) conditions indicated superparamagnetic behavior at temperatures higher than 300 K. The optical absorption spectra exhibited a peak at around 325 nm. This was analyzed satisfactorily on the basis of a metal core-oxide shell nanoconfiguration. The extracted values of metal core conductivity showed a metal insulator transition for iron core diameters less than 2.4 nm. The present synthesis approach will lead to newer multiferroic nanocomposites and glasses with multifunctionalities.

Original languageEnglish (US)
Pages (from-to)2254-2259
Number of pages6
JournalJournal of Non-Crystalline Solids
Issue number45-47
StatePublished - Nov 1 2009


  • Absorption
  • Ferroelectric
  • Magnetic properties
  • Nanocomposites
  • Silicates

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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