Partial enthalpy of mixing of yttrium (Delta(mix) (H) over bar (Y)) in the Ge-Y system was measured at 1770 K using a new high-temperature mixing calorimeter. Literature data on the enthalpies of mixing in the Ge-Y system and results of present examination were compared and discussed. Temperature dependence of Delta(mix)(H) over bar (Y) was estimated based on comparative analysis of the enthalpies of mixing, and corresponding heat capacity change at alloy formation was evaluated. Polynomial equations approximating thermodynamic functions (Delta(mix)(H) over bar (Y), Delta(mix)H, Delta(mix)(C) over bar (p).(Y), and Delta(mix)C(p)) versus yttrium mole fraction were determined. Some trends observed in the thermodynamic properties of the Ge-Y alloys were described. (c) 2005 Elsevier B.V. All rights reserved.