Specific Heat of α Al2O3 from 2 to 25 K
- 1 June 1969
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 40 (7) , 3034-3036
- https://doi.org/10.1063/1.1658118
Abstract
The heat capacity of colorless synthetic sapphire (α Al2O3, corundum) has been measured from 2 to 25 K. The data above 14 K can be expressed as Cv = 1.755×10−3T3+1.905×10−7T5 mJ/K·g‐atom. This equation for Cv gives Θ0 = 1035 K, in good agreement with the values calculated from elastic constant data. An extrapolation of these results to higher temperatures is consistent with other data. Below 14 K an anomalous heat‐capacity contribution appears which is about 1.5% of Cv at its maximum. The magnitude of this anomaly corresponds to that which would be given by a few ppm of gaseous or transition‐metal impurities.This publication has 7 references indexed in Scilit:
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