Contributions to the Data on Theoretical Metallurgy: [Part] 8. The Thermodynamic Properties of Metal Carbides and Nitrides Page: 1
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CONTRIBUTIONS TO THE DATA ON THEORETICAL METAL-
LURGY. VIII. THE THERMODYNAMIC PROPERTIES OF
METAL CARBIDES AND NITRIDES'
By K. K. KELLEY 2
INTRODUCTION
The collection and correlation of thermodynamic data concerning
substances of metallurgical interest have constituted one of the major
activities of the Pacific Experiment Station of the Bureau of Mines,
at Berkeley, Calif., for the past several years. Earlier bulletins (32,
33, 34, 35, 36, 37, 38) 3 in this series are entitled: (1) Contributions to
the Data on Theoretical Metallurgy. I. The Entropies of Inorganic
Substances; (2) Contributions to the Data on Theoretical Metallurgy.
II. High-Temperature Specific-Heat Equations for Inorganic Sub-
stances; (3) Contributions to the Data on Theoretical Metallurgy.
III. The Free Energies of Vaporization and Vapor Pressures of In-
organic Substances; (4) Contributions to the Data on Theoretical
Metallurgy. IV. Metal Carbonates-Correlations and Applications
of Thermodynamic Properties; (5) Contributions to the Data on
Theoretical Metallurgy. V. Heats of Fusion of Inorganic Sub-
stances; (6) Contributions to the Data on Theoretical Metallurgy.
VI. A Revision of the Entropies of Inorganic Substances-1935; and
(7) Contributions to the Data on Theoretical Metallurgy. VII. The
Thermodynamic Properties of Sulphur and its Inorganic Compounds.
The present paper collects and discusses thermodynamic data relat-
ing to metal carbides and nitrides, with the view of obtaining usable
heat and free energy of formation relationships. Pertinent data on
both classes of substances are difficult to obtain experimentally and
consequently are extremely rare; it is therefore necessary in many
cases, if equations are to be derived, to introduce certain approxima-
tions and assumptions. Lack of adequate means of checking results
by utilizing data of different types, such as was done frequently in the
bulletins dealing with carbonates and sulphates, are readily apparent
to anyone who has made even a cursory examination of the available
information. Consequently, some of the relationships derived un-
doubtedly will be found to be inaccurate when more or better data
become available. Nevertheless, in view of the importance of some
of these substances, it appears worth while to consider the information
available at present and to attempt the formulation of as complete a
I Work on manuscript completed January 1937.
2 Chemist, Metallurgical Division, Bureau of Mines.
3 Italicized numbers in parenthesis refer to citations in the bibliography at the end of this report. Page
references represent those in the citation and not in this bulletin.
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Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 8. The Thermodynamic Properties of Metal Carbides and Nitrides, report, 1935; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12572/m1/3/: accessed April 27, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.