✦ LIBER ✦

On the thermal expansion of β-cristobalite

✍ Scribed by I. P. Swainson; M. T. Dove

Publisher: Springer-Verlag
Year: 1995
Tongue: English
Weight: 479 KB
Volume: 22
Category: Article
ISSN: 0342-1791
DOI: 10.1007/bf00202681

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✦ Synopsis

We have measured the temperature dependence of the cell parameter of cubic fl-cristobalite up to 1300 ~ C by high-precision X-ray powder diffraction. The thermal expansion coefficient decreases on heating, until above 1000 ~ C the cell parameter is virtually constant in value. We discuss this change in the thermal expansion with reference to the behaviour of low-frequency rigid unit modes and fluctuations associated with the ~-fl phase transition.

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