Characterisation of microstructure and hardness of perovskite-structured Ba0.5Sr0.5Co0.8Fe0.2O3 - δ under different sintering conditions

Li Wang, Rui Dou, M. Bai, Yizhe Li, David Hall, Ying Chen

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Microstructural evolution of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ (BSCF) has been investigated using commercial powders sintered at different conditions. All the samples, characterised by the porosity P and grain size D, are determined to be a single cubic phase. The grain growth kinetics is evaluated using Dn = tK0exp(−Q/RT). Grain boundary diffusion is the dominant controlling mechanism of densification and the Ba/Sr diffusion is the rate-controlling species. Additionally, the Vickers hardness (HV) of BSCF is measured at ambient condition. The HV is successfully described by an exponential function of porosity, HV = H0exp(−bP). The porosity is the dominant factor determining the hardness when it is over 0.06. Otherwise, the Vickers hardness shows a dependence on pore size. Compared with the strong dependence of hardness on porosity, no correlation between hardness and grain size or grain orientation has been found.
Original languageEnglish
Pages (from-to)1659-1667
Number of pages9
JournalJournal of the European Ceramic Society
Volume36
Issue number7
Early online date11 Feb 2016
DOIs
Publication statusPublished - Jun 2016
Externally publishedYes

Keywords

  • Porosity
  • Hardness
  • BSCF
  • Grain growth kinetics
  • EBSD

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