TY - JOUR
T1 - Temperature dependence of lattice parameters and anisotropic thermal expansion of bismuth oxide
AU - Yashima, Masatomo
AU - Ishimura, Daiju
AU - Ohoyama, Kenji
PY - 2005/8/1
Y1 - 2005/8/1
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1551-2916.2005.00432.x
DO - 10.1111/j.1551-2916.2005.00432.x
M3 - Article
AN - SCOPUS:27644522910
VL - 88
SP - 2332
EP - 2335
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 8
ER -