LOW-TEMPERATURE HEAT-CAPACITY OF ORDERED FE25PD75-XAUX ALLOYS

Heat capacity of atomic-ordered Fe25Pd75-xAux alloys with x s 37.5 at. % is investigated in the temperature range 3 K < T < 30 K. The tempera ture and concentration dependences of low temperature heat capacity in the region of phase transition from ferromagnetic (x < 5 at.%) to ant iferromagnetic (x greater-than-or-equal-to 25 at.%) state are discusse d. The anomalous behaviour of C(p)(T) at T approximately 7 K discovere d in the transition region of concentrations is supposed to be connect ed with the lattice contribution to the heat capacity, with the possib ility or thermoelastic martensite transformation in the alloys which i s accompanied by the appearance of structural distortions.