Perovskite-type BaTiO3 ceramics containing particulate SiC: Part I. Structure variation and phase transformation

H. J. Hwang, T. Sekino, K. Ota, K. Niihara

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

BaTiO3-based composites with nanosized SiC particulates were successfully fabricated by a hot-pressing technique in an argon atmosphere. Crystal structure and phase transformation behaviour were investigated by X-ray diffraction analysis, linear thermal expansion analysis and internal friction measurement. It was confirmed that the added SiC particulates were uniformly distributed within the matrix BaTiO3 grains, with some larger particulates located at the BaTiO3 grain boundaries. In addition, there were no reaction phases between BaTiO3 matrix and SiC particulates. The crystal structure gradually changed from tetragonal to cubic phase with respect to the SiC content. The Curie temperature, Tc, was lowered as the SiC content increased. Moreover, the transformations in the low-temperature range almost disappeared above 1 vol % SiC. The diffused phase transformation phenomenon was observed as the SiC content increased up to 3 vol %. The results were associated with the grain-size reduction, the existence of oxygen vacancies and the residual stresses associated with the thermal expansion mismatch between matrix and SiC particulate. The influence on the domain structure development of SiC particulates dispersed within the matrix grains was also discussed.

Original languageEnglish
Pages (from-to)4617-4624
Number of pages8
JournalJournal of Materials Science
Volume31
Issue number17
DOIs
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Perovskite-type BaTiO<sub>3</sub> ceramics containing particulate SiC: Part I. Structure variation and phase transformation'. Together they form a unique fingerprint.

Cite this