Uniform coating of nanometer-scale BaTiO 3 layer on spherical Ni particles via hydrothermal conversion of Ti-hydroxide

Jae Young Lee, Seong Hyeon Hong, Jong Heun Lee, Yong Kyun Lee, Jae Young Choi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A uniform BaTiO 3 nano layer was coated on spherical Ni particles for multilayer ceramic capacitor applications via a Ti-hydroxide coating using the controlled hydrolysis of a TiCl 4 butanol solution containing (C 2H 5) 2NH (diethylamine, DEA) and its subsequent hydrothermal reaction at various [Ba(OH) 2], residual [DEA], and hydrothermal temperatures. The hydrothermal conversion was successful at [Ba(OH) 2] ≥0.065M (Ba/Ti ≥ 1.3) and T ≥ 150°C, and the residual DEA in the Ti-hydroxide coating layer not only affected the formation of the BaTiO 3 phase but also resulted in a rough surface morphology. When a minimal amount of DEA was involved in the formation of Ti-hydroxide, a uniform BaTiO 3 coating with a clean surface morphology could be attained, which was confirmed by elemental mapping of the coated powder and the observation of hollow spheres after removing the Ni core. The BaTiO 3 coating was very effective not only in preventing Ni oxidation but also in shifting the starting point of Ni densification to a higher temperature.

Original languageEnglish
Pages (from-to)303-307
Number of pages5
JournalJournal of the American Ceramic Society
Volume88
Issue number2
DOIs
Publication statusPublished - 2005

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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