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Synthesis, crystal structure, and anisotropic thermal expansion of Dy4.67(SiO4)3O

Published online by Cambridge University Press:  03 March 2011

S.T. Misture ,
S.P. Harvey ,
R.T. Francy ,
Y. Gao S. DeCarr  and
S.C. Bancheri
S.T. Misture
Affiliation:
NYS College of Ceramics at Alfred University, Alfred, New York 14802
S.P. Harvey
Affiliation:
NYS College of Ceramics at Alfred University, Alfred, New York 14802
R.T. Francy
Affiliation:
NYS College of Ceramics at Alfred University, Alfred, New York 14802
Y. Gao S. DeCarr
Affiliation:
GE Global Research, Niskayuna, New York 12309
S.C. Bancheri
Affiliation:
GE Global Research, Niskayuna, New York 12309
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Abstract

A new phase in the Dy–Si–O system, Dy4.67(SiO4)3O, was prepared in powderform using the mixed oxide method. Dy4.67(SiO4)3O was first observed at 1300 °C, and phase purity was achieved after 96 h at 1600 °C. The crystal structure was determined using single crystal diffraction using synchrotron radiation, and powder x-ray diffraction data was refined using the Rietveld method. The structure was found to be apatite-type, hexagonal, with space group P63/m and a = b = 0.93883(2) nm,c = 0.67820(1) nm, Z = 2. High-temperature x-ray powder diffraction was used to characterize the anisotropic thermal expansion over the temperature range of 24–1450 °C, providing the axial and cell volume expansion.

Keywords

X-ray diffraction (XRD)Crystallographic structurePhase equilibria

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Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2330 - 2335
Copyright
Copyright © Materials Research Society 2004

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