Temperature dependence of lattice parameters and anisotropic thermal expansion of bismuth oxide

Masatomo Yashima, Daiju Ishimura, Kenji Ohoyama

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17 Citations (Scopus)

Abstract

Temperature dependence of lattice parameters of bismuth se-squioxide (Bi2O3) has been obtained between 26° and 778°C by the Rietveld method using neutron powder diffraction data. Lattice parameters a*α, b*α, c *α, aδ and unit-cell volume of α and δ phases increased, while the β angle of α phase decreased with an increase of temperature. Here the a*α denotes the lattice parameter a of the α phase on the basis of pseudo-fluorite lattice. The thermal expansion coefficients of α phase were 26.7, 6.6, and 9.0 ( × 10-6°C-1) for a *α, b*α, and c *α axes, respectively, indicating a large anisotropy. The α- to -δ phase transition of Bi2O3 was confirmed between 721° and 760°C on heating. At the α-δ transition point, the lattice parameters and unit-cell volume discontinuously changed, indicating that the transition is of the first order.

Original languageEnglish
Pages (from-to)2332-2335
Number of pages4
JournalJournal of the American Ceramic Society
Volume88
Issue number8
DOIs
Publication statusPublished - 2005 Aug 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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