Cubic to tetragonal phase transformation of ultrafine batios crystallites at room temperature

Fu Su Yen, Hsing I. Hsiang, Yen Hwei Chang

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

The critical crystallite size for the cubic (c-) to tetragonal (t-) phase transformation of ultrafine BaTiC>3 crystallites was examined. Crystallites were prepared by calcination of barium titanyl oxalate tetrahydrate (BTOT) at various temperatures as to obtain crystallites with different sizes. The c-BaTi03 crystallite which is thermodynamically considered as a high-temperature form can exist at room temperature if the crystallite is smaller than certain size. The critical size for the c—M; phase transformation is ˜30 nm. The size may become larger if the crystallite suffers higher lattice strain which can be induced by different powder preparation methods.

Original languageEnglish
Pages (from-to)6149-6155
Number of pages7
JournalJapanese Journal of Applied Physics
Volume34
Issue number11R
DOIs
Publication statusPublished - 1995 Nov

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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