Effect of excess TiO2 on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO3 powders

Haitao Huang, Wei Qiu, Ooi Kiang Tan, Weiguang Zhu, Li Min Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Nanoscaled (Ba2/3Sr1/3)Ti1 + xO3powders have been prepared by sol-gel technique. Their phase evolution and densification behaviors have been studied by differential thermal analysis (DTA) and high temperature dilatometer, respectively. It is found the addition of 2 mol%-excess amount of TiO2lowers the activation energy required for the formation of the perovskite phase by about 130 kJ/mol and thus lowers the crystallization temperature of BST powders. However, the excess amount of TiO2makes the nano-powder difficult to sinter. Transmission electron microscopy reveals that a metastable nano-porous layer has formed on the surface of TiO2-excess nanopowder and this may account for the slow densification rate.
Original languageEnglish
Pages (from-to)337-341
Number of pages5
JournalJournal of Electroceramics
Volume16
Issue number4
DOIs
Publication statusPublished - 1 Jul 2006

Keywords

  • BST
  • Microstructure
  • Sol-gel

ASJC Scopus subject areas

  • Ceramics and Composites

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