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Determination of heats of formation of praseodymium antimonides

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Abstract

A systematic investigation of the heats of formation in the Pr-Sb system has been performed using a small-furnace, isoperibolic calorimeter. The compositions and the equilibrium states of the samples have been checked by metallographic and X-ray analyses. The following values have been found for the various compounds (kJ/g atom±2): Pr2Sb:-99; Pr5Sb3:-112; Pr4Sb3:-120; PrSb:-126; PrSb2:-97.

The data available (both the results obtained in this work and those already known) are discussed briefly and related to the possible shape of the phase diagram.

Zusammenfassung

Es wurde eine systematische Untersuchung der Bildungswärmen im Pr/Sb-System unter Verwendung eines Kleinofen-Isoperibolkalorimeters ausgeführt. Die Zusammensetzung und der Gleichgewichtszustand der Proben wurden durch metallographische und röntgenographische Analyse ermittelt. Für die einzelnen Verbindungen wurden folgende Werte (kJ·mol−1 ±2.0) gefunden: Pr2Sb:-99; Pr5Sb3:-112; Pr4Sb3:-120;PrSb:-126; PrSb2:-97. Die als Ergebnis dieser Arbeit erhaltenen und aus der Literatur bereits bekannte Daten werden kurz diskutiert und mit einem möglichen Phasendiagramm in Verbindung gebracht.

Резюме

Проведено системати ческое исследование теплот образования в системе Рг-Sb, используя изоперибо льный калориметр с ма лой печкой. Состав и равновесное состояние образцов проверены м еталлографическим и рентгеноструктурны м анализами. Для соеди нений различного состава б ыли определены следу ющие величины теплот обра зования (приведены в кдж(г-атом)−1 ±2.0): Pr2Sb-99; Pr5Sb3-112; PrSb3-120; PrSb-126; PrSb2-97. Полученные данные кр атко обсуждены наряд у с известными в литерат уре и связаны с возмож ной формой фазовой диагр аммы.

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  1. Istituto di Chimica Generale ed Inorganica, Università Genova, Italia

    G. Borzone, A. Borsese, G. Zanicchi & R. Ferro

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  1. G. Borzone
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  2. A. Borsese
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  3. G. Zanicchi
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  4. R. Ferro
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Borzone, G., Borsese, A., Zanicchi, G. et al. Determination of heats of formation of praseodymium antimonides. Journal of Thermal Analysis 25, 433–440 (1982). https://doi.org/10.1007/BF01912969

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