The density and heat capacity of liquid Li/Na alloys

Liquid Li/Na exhibits a miscibility gap with a critical temperature T c =577+or-1 K and a critical composition chi c =36+or-1.5 at.% Na. At temperatures up to about 900 K we observed for the single-phase liquids an ideal behaviour of the molar volume with respect to variations of T and chi . We studied the shape of the miscibility gap and observed a critical exponent beta =0.50+or-0.015 in the range 5*10 -5 <(T c -T)/T c <2*10 -2 . At chi c the heat capacity c p increases on approaching T c with a critical exponent alpha =0.32+or-0.07 which was observed in the range 4*10 -3 <(T-T c )/T c <0.44.