Thermal expansion coefficients for indialite,emerald, and beryl |
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| Authors: | John L Schlenker G V Gibbs Elizabeth G Hill Sharon S Crews R H Myers |
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| Institution: | 1. Department of Geological Sciences, Virginia Polytechnic Institute and State University, 24061, Blacksburg, Virginia, USA
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| Abstract: | Thermal expansion coefficients ?1 and ?3 calculated for the hexagonal minerals indialite, emerald and beryl are, in general, small with ?3 being negative near room temperature. This unusual behavior leads to low volume coefficients of thermal expansion (β=2?1+?3) making these materials ideal ceramic bodies for catalyst carriers in air-pollution control. The temperature at which the c-cell edge length of beryl is a minimum is strongly dependent upon the presence of trace amounts of impurity atoms. This effect is ascribed to changes in the Grüneisen parameters. |
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