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Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K

As a step in developing new standards of high-temperature heat capacity and in determining accurate thermodynamic data for simple substances, the enthalpy (heat content) relative to 273 °K, of high purity fused magnesium oxide, MgO, and of sintered beryllium oxide, BeO, was measured up to 1,173 °K....

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Detalles Bibliográficos
Autores principales: Victor, Andrew C., Douglas, Thomas B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1963
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5317226/
https://www.ncbi.nlm.nih.gov/pubmed/31580570
http://dx.doi.org/10.6028/jres.067A.034
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author Victor, Andrew C.
Douglas, Thomas B.
author_facet Victor, Andrew C.
Douglas, Thomas B.
author_sort Victor, Andrew C.
collection PubMed
description As a step in developing new standards of high-temperature heat capacity and in determining accurate thermodynamic data for simple substances, the enthalpy (heat content) relative to 273 °K, of high purity fused magnesium oxide, MgO, and of sintered beryllium oxide, BeO, was measured up to 1,173 °K. A Bunsen ice calorimeter and the drop method were used. The two samples of BeO measured had surface-to-volume ratios differing by a factor of 15 or 20, yet agreed with each other closely enough to preclude appreciable error attributable to the considerable surface area. The enthalpies found for MgO are several percent higher than most previously reported values. The values are represented within their uncertainty (estimated to average ± 0.25%) by the following empirical equations (cal mole(−1) at T °K) [Formula: see text] Values of enthalpy, heat capacity, entropy, and Gibbs free-energy function are tabulated from 298.15 to 1,200 °K.
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spelling pubmed-53172262019-10-01 Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K Victor, Andrew C. Douglas, Thomas B. J Res Natl Bur Stand A Phys Chem Article As a step in developing new standards of high-temperature heat capacity and in determining accurate thermodynamic data for simple substances, the enthalpy (heat content) relative to 273 °K, of high purity fused magnesium oxide, MgO, and of sintered beryllium oxide, BeO, was measured up to 1,173 °K. A Bunsen ice calorimeter and the drop method were used. The two samples of BeO measured had surface-to-volume ratios differing by a factor of 15 or 20, yet agreed with each other closely enough to preclude appreciable error attributable to the considerable surface area. The enthalpies found for MgO are several percent higher than most previously reported values. The values are represented within their uncertainty (estimated to average ± 0.25%) by the following empirical equations (cal mole(−1) at T °K) [Formula: see text] Values of enthalpy, heat capacity, entropy, and Gibbs free-energy function are tabulated from 298.15 to 1,200 °K. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1963 1963-08-01 /pmc/articles/PMC5317226/ /pubmed/31580570 http://dx.doi.org/10.6028/jres.067A.034 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
spellingShingle Article
Victor, Andrew C.
Douglas, Thomas B.
Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title_full Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title_fullStr Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title_full_unstemmed Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title_short Thermodynamic Properties of Magnesium Oxide and Beryllium Oxide from 298 to 1,200 °K
title_sort thermodynamic properties of magnesium oxide and beryllium oxide from 298 to 1,200 °k
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5317226/
https://www.ncbi.nlm.nih.gov/pubmed/31580570
http://dx.doi.org/10.6028/jres.067A.034
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