Thermodynamic Properties of La–Ni Alloys

P.M.Subotenko,
 
V.G.Kudin,
 
M.O.Shevchenko,
  
V.Berezuckiy,
  

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #11/12
http://www.materials.kiev.ua/article/2274

Abstract

The mixing enthalpies of the La–Ni binary liquid alloys are determined by isoperibol calorimetry in the composition range 0 < хNi <0.45 at 1430 K and 0.75 < xNi < 0.80 at 1800 K. The thermodynamic properties of the La–Ni binary liquid alloys are calculated for the entire composition range using the model of ideal associated solutions and reliable published data. The thermodynamic activities of components show negative deviations from the ideal behavior; the mixing enthalpies are characterized by exothermic effects. The minimum mixing enthalpy of the melts is –28.0 ± 0.2 kJ/mol at xNi = 0.6.


IDEAL ASSOCIATED SOLUTION MODEL, ISOPERIBOL CALORIMETRY, LA–NI SYSTEM, MIXING ENTHALPY, THERMODYNAMIC PROPERTIES