Sintering behavior, microstructure, and dielectric properties of nano-Ba0.7Sr0.3TiO3 ceramics

Kuo Liang Ying, Tsung-Eong Hsien*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Nanoscale Ba0.7Sr0.3TiO3 (BST) powders were synthesized by solid-state reaction, chemical dispersion, and mechanical grinding. Capacitor samples based on the nano-BST powders were then prepared; their sintering behaviors at different temperatures, dielectric properties, and correlations to microstructure were investigated accordingly. It was found that specific sintering conditions are essential for achieving high-density (≥95%) BST samples with a desired microstructure. Dielectric property measurements revealed that the best result was achieved in samples sintered at 1200 °C for 6h (dielectric constant = 9700; dielectric loss = 0.04) or at 1300 °C for 1 h (dielectric constant = 9800; dielectric loss = 0.075). The BST samples exhibited a lower Curie point (Tc) than conventional BaTiO 3 (BTO) and BST systems. The improvement of dielectric properties and phase transition temperature were attributed to the fine grain structure in BST samples.

Original languageEnglish
Pages (from-to)7947-7952
Number of pages6
JournalJapanese Journal of Applied Physics
Volume47
Issue number10 PART 1
DOIs
StatePublished - 1 Oct 2008

Keywords

  • BaSrTiO (BST)
  • Dielectric properties
  • Nanoscale ceramics
  • Sintering

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