Synthesis and characterization of rare-earth doped SrBi2Nb2O9 phase in lithium borate based nanocrystallized glasses

B. Harihara Venkataraman, Takumi Fujiwara, Takayuki Komatsu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Glass composites comprising of un-doped and samarium-doped SrBi2Nb2O9 nanocrystallites are fabricated in the glass system 16.66SrO-16.66[(1-x)Bi2O3-xSm2O3]-16.66Nb2O5-50Li2B4O7 (0≤x≤0.5, in mol%) via the melt quenching technique. The glassy nature of the as-quenched samples is established by differential thermal analyses. Transmission electron microscopic studies reveal the presence of about 15 nm sized spherical crystallites of the fluorite-like SrBi1.9Sm0.1Nb2O9 phase in the samples heat treated at 530 °C. The formation of layered perovskite-type un-doped and samarium-doped SrBi2Nb2O9 nanocrystallites with an orthorhombic structure through the intermediate fluorite phase is confirmed by X-ray powder diffraction and micro-Raman spectroscopic studies. The influence of samarium doping on the lattice parameters, lattice distortions, and the Raman peak positions of SrBi2Nb2O9 perovskite phase is clarified. The dielectric constants of the perovskite SrBi2Nb2O9 and SrBi1.9Sm0.1Nb2O9 nanocrystals are relatively larger than those of the corresponding fluorite-like phase and the precursor glass.

Original languageEnglish
Pages (from-to)1538-1544
Number of pages7
JournalJournal of Solid State Chemistry
Volume182
Issue number6
DOIs
Publication statusPublished - 2009 Jun 1

Keywords

  • Dielectric constant
  • Glass
  • Micro-Raman spectra
  • Nanocrystallites
  • Perovskite like phase
  • Strontium bismuth samarium niobate

ASJC Scopus subject areas

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

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