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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 299-307 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: KNUDSEN-Messungen der Sublimation und die Bildungsenthalpie des GeSeKNUDSEN-Messungen der Sublimation von polykristallinem GeSe sind massenspektroskopisch bei Temperaturen von ungefähr 530-730°K und mittels einer Vakuumwaage im Temperaturbereich 601-796°K und bei Drucken von etwa 10-6 bis 10-4 atm durchgeführt worden. Die Ergebnisse zeigen, daß GeSe unter gegebenen experimentellen Bedingungen kongruent verdampft nach der Gleichung GeSe(f) = GeSe(g).Aus den beobachteten Massenverlusten ergeben sich Mittelwerte für die Reaktionsenthalpie und Entropie von ΔH2980 = 42.0 ± 1.5 kcal/Mol und ΔS2980 = 42,3 ± 1,6 cl. Damit lassen sich die Bildungsenthalpie und absolute Entropie des GeSe(f) zu -10.1 ± 2.0 kcal/mol bzw. 16,9 ± 2,0 cl berechnen.
    Notes: KNUDSEN effusion studies of the sublimation of polycrystalline GeSe have been performed employing mass spectrometry in a temperature range of about 530-730°K and vacuum microbalance techniques in the temperature range 601-796°K and at pressures ranging from about 10-6-10-4 atm. The results are concordant and demonstrate that GeSe vaporizes congruently under present experimental conditions according to the reaction GeSe(s) = GeSe(g).The mean values for the third law heat and second law entropy of reaction based on direct mass-loss data are ΔH2980 = 42.0 ± 1.5 kcal/mole and ΔS2980 = 42.3 ± 1.6 eu. From these data the standard heat of formation and absolute entropy of GeSe(s) were calculated to be -10.1 ± 2.0 kcal/mole and 16.9 ± 2.0 eu, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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