Growth and Phase Transformation of Nanometer-Sized Titanium Oxide Powders Produced by the Precipitation Method

Gwan Lee Hyoung, Jian Min Zuo

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We report an in situ TEM investigation of the growth and transformation in nanometer-sized titania powders. The powders were produced through precipitation of titanium tetrachloride under different pH conditions. The initial phase of the produced powders was amorphous or was a mixture of anatase and brookite according to the pH conditions. During calcination, the anatase particles grew and transformed into rutile. The transformation temperature increased with increasing pH value. In situ TEM observations showed that the anatase particles were absorbed into rutile, and then rutile particles grew by coalescence. Furthermore, small pores were observed to form in samples prepared with high pH from the effects of hydroxyl ions and zeta potential. Pore formation increased the surface area, which delayed the transformation and nucleation of rutile. This explains the difference of growth and transformation of titania powders produced under different pH conditions during calcination.

Original languageEnglish
Pages (from-to)473-479
Number of pages7
JournalJournal of the American Ceramic Society
Volume87
Issue number3
DOIs
Publication statusPublished - 2004 Mar

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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