from the behaviour of a mechanical mixture) was calculated using
heat capacities of the end members from the literature [40–42].It
is plotted against temperature in figure 1 and shows a prominent
negative peak at 40 K with maximum negative excess heat capacity
values of 0.20 and 0.44 J mol
1
K
1
for CuZn15 and
CuZn34, respectively. Between T = 90 K and 300 K, the excess heat
capacity behaviour seems to be more or less ideal.