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Equilibri di fase nelle regioni terminali del sistema Neodimio-Oro

Aldo Borsese;  Renzo Capelli;  Stefano Delfino;  Riccardo Ferro — 1973

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

Differential thermo-analysis, chemical analysis, metallographic and X-ray examinations were used for studying Nd–Au alloys. The comparison between results obtained performing thermoanalysis by heating pre-annealed samples or by cooling them from the melt shows that, very often, slow rates of formation delay the equilibration of the solid phases. Following invariant equilibria were observed: Eutectic: Liq ⇄ Au + AuNd (800° ± 5) Peritectic: Liq + AuNd ⇄ AuNd (840° ± 5) Peritectic: Liq + AuNd...

Misura di calori di formazione nel sistema Platino-Stagno

Riccardo Ferro;  Renzo Capelli;  Aldo Borsese;  Stefano Delfino — 1973

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

The general trend of the exothermic heat of formation of the Pt-Sn alloys has been outlined by using a “direct calorimeter”. Typical values of the Δ ⁢ H f ⁢ o ⁢ r ⁢ m 298 ∘ ⁢ K are the following: P ⁢ t 3 ⁢ S ⁢ n - 12.0 ± 0.5 , P ⁢ t ⁢ S ⁢ n - 14.0 ± 0.5 , Kcal/g.at.

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