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Structures and anisotropic thermal expansion of the α, β, γ, and δ polymorphs of Y2Si2O7

Published online by Cambridge University Press:  29 February 2012

M. D. Dolan ,
B. Harlan ,
J. S. White ,
M. Hall ,
S. T. Misture ,
S. C. Bancheri  and
B. Bewlay
M. D. Dolan
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802and CSIRO Division of Energy Technology, Kenmore, Queensland 4069, Australia
B. Harlan
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
J. S. White
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
M. Hall
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
S. T. Misture*
Affiliation:
New York State College of Ceramics at Alfred University, Alfred, New York 14802
S. C. Bancheri
Affiliation:
GE Global Research, 1 Research Circle, Niskayuna, New York 12309
B. Bewlay
Affiliation:
GE Global Research, 1 Research Circle, Niskayuna, New York 12309
*
a)Author to whom correspondence should be addressed. Electronic mail: misture@alfred.edu
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Abstract

The α, β, γ, and δ polymorphs of Y2Si2O7 were synthesized using sol-gel and solid-state methods. The structures of the α and γ polymorphs were determined by identification of isostructural rare-earth disilicates, and the structures were refined using Rietveld analysis of X-ray powder diffraction data. The α polymorph crystallizes in space group P1, with a=6.5872(6) Å, b=6.6387(7) Å, c=12.032(1) Å, α=94.501(7)°, β=90.984(8)°, γ=91.771(7)°, and volume=524.16(9) Å3. The γ form is described by space group P21/c, a=4.68824(5) Å, b=10.84072(9) Å, c=5.58219(6) Å, and γ=96.0325(3)°. The anisotropic thermal expansion of each phase was measured using high temperature diffraction up to 1200 or 1400 °C, depending on the stability of the polymorph. The thermal expansion is highly anisotropic for all polymorphs, with the low-expansion direction normal to the long axis of the corner-shared SiO4 tetrahedra.

Keywords

crystal structurehigh temperature diffractionthermal expansionphase transition
Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Issue 1 , March 2008 , pp. 20 - 25
Copyright
Copyright © Cambridge University Press 2008

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