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The thermal expansion of anhydrite to 1000° C

Physics and Chemistry of Minerals

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DOI: 10.1007/BF00308361

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Abstract

The thermal expansion of anhydrite, CaSO4, has been measured from 22° to 1,000° C by X-ray diffraction, using the Guinier-Lenné heating powder camera. The heating patterns were calibrated with Guinier-Hägg patterns at 25° C, using quartz as internal standard. Heating experiments were run on natural anhydrite (Bancroft, Ontario), which at room temperature has lattice constants in close agreement with those of synthetic material. The orthorhombic unit cell at 22° C (space groupAmma) has a=7.003 (1) Å, b=6.996 (2) Å and c=6.242 (1) Å, V=305.9 (2) Å3. At room temperature, the thermal expansion coefficients α and β (α in °C−1×104, β in °C−2×108) are for a, 0.10, −0.69; forb, 0.08, 0.19; for c, 0.18, 1.60; for V, 0.37, 1.14. Second-order coefficients provide an excellent fit over the whole range to 1,000° C.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The thermal expansion of anhydrite to 1000° C
Series title:
Physics and Chemistry of Minerals
DOI:
10.1007/BF00308361
Volume
4
Issue:
1
Year Published:
1979
Language:
English
Publisher:
Springer
Description:
6 p.
First page:
77
Last page:
82
Online Only (Y/N):
N
Additional Online Files(Y/N):
N