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Thermal expansion and high-temperature phase transformation of the yttrium silicate Y2SiO5

Published online by Cambridge University Press:  31 January 2011

J. W. Nowok ,
J. P. Kay  and
R. J. Kulas
J. W. Nowok
Affiliation:
Materials Science, Energy and Environmental Research Center, University of North Dakota, P.O. Box 9018, Grand Forks, North Dakota 58202
J. P. Kay
Affiliation:
Materials Science, Energy and Environmental Research Center, University of North Dakota, P.O. Box 9018, Grand Forks, North Dakota 58202
R. J. Kulas
Affiliation:
Materials Science, Energy and Environmental Research Center, University of North Dakota, P.O. Box 9018, Grand Forks, North Dakota 58202
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Abstract

The linear thermal-expansion coefficients of yttrium silicate Y2SiO5, [Y2(SiO4)O] were measured in the temperature range from 20 to 1400 °C using x-ray diffraction. The anomalous behavior of thermal expansion was observed above Tc = 850 °C and was attributed to the displacive phase transformation. The transformation was reversible and resulted from the local order °C the compositional disorder and local fluctuation in the elastic free energy constrained a secondary transformation related to the polymorphic twin transformation. This created an additional peak in x-ray diffraction patterns at 2 's intensity. The characteristic of phase transformation both on heating and on cooling of the sample was also investigated using the differential thermal analysis method. The thermogravimetric technique did not indicate on a change of weight at Tc.

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Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2251 - 2255
Copyright
Copyright © Materials Research Society 2001

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References

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