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Note on thermodynamic instability ofM 4C3-type carbides of gallium group metals

Über die Instabilität von Galliumgruppenkarbiden des TypsM 4C3

  • Inorganic And Physical Chemistry
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Abstract

The paper deals with thermodynamic stability of hypothetical solid binaryM 4C3 carbides of gallium, indium and thallium. Heats of formation whose contribution to the stability of these compounds is dominant, were estimated by two independent methods: semiempirical theory ofMiedema and empirical trends in the heats of formation of nitrides and carbides of Group III elements. Entropies were calculated with the use of theCantor equation. The estimated values suggest thatM 4C3 carbides of gallium, indium and thallium are thermodynamically unstable with regard to their decomposition to elements.

Zusammenfassung

Es wird die thermodynamische Stabilität von hypothetischen Gallium-, Indium- und Thalliumkarbiden diskutiert. Zur Abschätzung von Bildungswärmen, deren Beitrag zur Stabilität dieser Verbindungen dominant ist, wurden zwei unabhängige Methoden verwendet: die semiempirischeMiedema-Theorie und empirische Trends der Bildungswärmen bei den Nitriden und Karbiden der Elemente der III. Gruppe. Die Entropiewerte wurden mittels derCantor-Gleichung berechnet. Aus den abgeschätzten Werten geht hervor, daß die Galliumgruppenkarbide bezüglich der Zersetzung in die Elemente thermodynamisch instabil sind.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Prague Institute of Chemical Technology, CS-166 28, Prague, Czechoslovakia

    Bohumil Hájek, Vladimír Kohout & Vratislav Flemr

Authors
  1. Bohumil Hájek
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  2. Vladimír Kohout
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  3. Vratislav Flemr
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Hájek, B., Kohout, V. & Flemr, V. Note on thermodynamic instability ofM 4C3-type carbides of gallium group metals. Monatsh Chem 117, 1157–1164 (1986). https://doi.org/10.1007/BF00811328

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  • DOI: https://doi.org/10.1007/BF00811328

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