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La-Ni binary system was thermodynamically assessed taking into account of La5Ni19 phase,which existed at 623 K from XRD results.The peritectic reaction at 1276 K (L+LaNi5→La5Ni19) was confirmed by DSC analysis.The calculated phase diagram showed a good agreement with the experimental data reported in literatures and obtained in this work.The thermodynamic properties of LaNi5 and La24.5Ni74.5 were investigated by PCT and HP DSC.