In-situ fabrication of ceramic/Metal nanocomposites by reduction reaction in barium titanate-Metal oxide systems

Hae Jin Hwang, Motohiro Toriyama, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Novel ceramic/metal nanocomposites were prepared by in-situ reduction method in BaTiO3/NiO, BaTiO3/WO3 and BaTiO3/MoO3 systems. The fabrication processes and the phase stability of these metal and metal oxides were studied using X-ray diffraction analysis and thermodynamic consideration. For BaTiO3/NiO system, NiO was entirely reduced at 500°C for several hours and dense BaTiO3/Ni nanocomposites were obtained without additional reaction phases. However, it was confirmed that a small amount of Ni2+ was dissolved in the BaTiO3 lattice. In the BaTiO3/WO3 system, in parallel with the reduction of WO3, BaTiO3 reacted with WO3 or WO2 to produce BaWO4. BaTiO3/W composite powder having no reaction products was difficult to fabricate by in-situ reduction process. On the other hand, BaTiO3/W composite could be obtained from BaTiO3 and W powder mixture when sintering below 1200°C. In contrast, the fabrication of BaTiO3/Mo composite was successfully achieved after reducing BaTiO3/MoO3 powder mixture at 800°C.

Original languageEnglish
Pages (from-to)2193-2199
Number of pages7
JournalJournal of the European Ceramic Society
Volume18
Issue number14
DOIs
Publication statusPublished - 1998 Dec

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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