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. 1982 Mar-Apr;87(2):159-163.
doi: 10.6028/jres.087.012.

Enthalpy and Heat-Capacity Standard Reference Material: Synthetic Sapphire (α-Al2O3) from 10 to 2250 K

D A Ditmars  1 , S Ishihara  1 , S S Chang  1 , G Bernstein  1 , E D West  2
Affiliations

Enthalpy and Heat-Capacity Standard Reference Material: Synthetic Sapphire (α-Al2O3) from 10 to 2250 K

D A Ditmars et al. J Res Natl Bur Stand (1977). 1982 Mar-Apr.

Abstract

Heretofore unpublished enthalpy data which were used in the derivation of smooth enthalpy and heat-capacity data for NBS SRM 720 (α-Al2O3, heal eapacily and enthalpy standard) are presented along with some details of the high-temperature experiments. Recent NBS low-temperature measurements on SRM 720 are smoothed by a least-squares spline technique and a revised table of certified values for enthalpy and heal capacity of α-Al2O3 from 10 K to near the melting point (2250 K) is presented.

Keywords: Aluminum oxide; Standard Reference Material; corundum; drop calorimetry; enthalpy; heat capacity; high temperature; synthetic sapphire.

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Figures

Figure 1.
Figure 1.
Temperature ranges for spline fit of low-temperature heat-capacity data for Al2O3.
See this image and copyright information in PMC

References

    1. NBS Certificate, Standard Reference Material 720, Synthetic Sapphire (Al2O3); August 26, 1970.
    1. Dilmars D. A.; Douglas T. B., J. Res. Nat, Bur. Stand. (U.S.), 75A (Phys. and Chem.), No. 5, 401 (Sep-Oct 1971). - PMC - PubMed
    1. Furukawa G. T.; Douglas T. B.; McCoskey R. E.; Ginnings D. C., J. Res. Nat. Bur. Stand. (U.S.), 57, No. 2, 67 (1956) RP2694,
    1. Chang S. S., Proceedings of the Seventh Symposium on Thermophysieal Properties, ASME; NBS, Gaithersburg, MD, May 10–12, 1977, 83 (1977).
    1. West E. D.; Ishihara S., A ealorimetric determination of the enthalpy of graphite from 1200 to 2600 K in Advances in Thermophysical Properties at Extreme Temperatures and Pressures, p. 146, ASME, New York, (1965). See also NBS Special Publication No. 300. vol. 6, p, 220 (1970).

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