Heat capacities, third-law entropies and thermodynamic functions of the negative thermal expansion materials, cubic $\{$alpha$\}$-ZrW $\{$sub 2$\}$ O $\{$sub 8$\}$ and cubic ZrMo $\{$sub 2$\}$ O $\{$sub 8$\}$, from T=(0 to 400) K Article (Faculty180)