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- W2045554778 abstract "La chaleur de formation des composés intermétalliques binaires terre-rare-élément de transition peut ětre calculée à partir du modèle semi-empirique de Miedema. Dans la structure des composés RM5 (R = terre-rare, M = élément de transition) la contraction du rayon atomique des atomes de terre-rare augmente avec la différence d'électronégativité ΔΦ* entre les constituants et est reliée à l'enthalpie de formation des composés. L'état de valence de Ce dans Ce-M peut ětre prévu à partir du calcul de l'enthalpie de formation; la valeur de la différence d'enthalpie entre les deux états de valence (Ce3+ ou Ce4+) est environ 80 kJ (mol Ce)−1. The heat of formation for binary rare-earth-transition metal intermetallic compounds can be predicted successfully from the semiempirical model of Miedema. In the crystal structure of RM5 phases (R = rare-earth, M = transition metal) the contraction of the rare-earth which becomes greater as the electronegativity difference ΔΦ* between the components increases, is connected with the enthalpy of formation of the compound. The valence state of Ce in transition metal compounds can be predicted from model calculation of the heat of formation; the value found for the energy difference between the two valence states (Ce3+ or Ce4+) of Ce is about 80 kJ (mol Ce)−1." @default.
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- W2045554778 date "1986-02-16" @default.
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- W2045554778 title "Etude thermodynamique des systèmes terre-rare-élément de transition à l'aide du modèle de Miedema" @default.
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- W2045554778 doi "https://doi.org/10.1002/pssa.2210930203" @default.
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