Enthalpies of formation of the La–Zn compounds between 298K and 910K

Critical Review of the La-Zn System

“…A comparison between this value and that obtained using the Kopp-Neumann rule suggests a negligible excess heat capacity (see Table 7). In the same study, Berche et al [26] performed solution calorimetry measurements at 665 K in tin bath to determine the enthalpies of formation of the La-Zn intermediate phases at 298 K. The result obtained for LaZn 13 agrees with Morishita's value [27] within the uncertainty limit (see Fig. 7).…”

“…A new interpretation of Kovalevskii's results at 1000 K was presented in Ref. [26]. This interpretation of e.m.f.…”

“…The investigated temperatures ranged from 700 to 1120 K. From these data, the partial Gibbs energies of lanthanum are calculated at 1000 K (see Table 5). Table 6 gives the partial enthalpies and entropies determined from the new interpretation of Kovalevskii's measurements [26]. Fig.…”

“…Recently, Berche et al [26] determined the heat content H T -H 298 of La 2 Zn 17 between room temperature and 665 K using the drop calorimetry method. A comparison between this value and that obtained using the Kopp-Neumann rule suggests a negligible excess heat capacity (see Table 7).…”

“…7). The enthalpies of formation of LaZn, LaZn 2 , LaZn 5 and La 2 Zn 17 were also calculated at 0K by Berche et al [26] using Density Functional Theory (DFT) calculations. The theoretical results are compared to those obtained experimentally by the same authors in Table 8 and in Fig.…”