The Constituent Additivity Method to Estimate Heat Capacities of Complex Inorganic Solids

Heat capacity, enthalpy and entropy of strontium niobates Sr2Nb10O27 and Sr5Nb4O15

“…5). The prediction ability of NKR for mixed oxides was discussed in [17,18], but it seems impossible now to state in which cases NKR will estimate the heat capacity with acceptable uncertainty in the high temperature region.…”

Thermal properties of the pyrochlore, Y2Ti2O7

“…In parallel with the Neuman-Kopp law which indicates that heat capacities can be approximated by the sum of the heat capacities of the constituent atoms, we have shown that for [29] inorganic oxides the heat capacity often can be estimated by the sum of the heat capacities of the constituent oxides [33]. Recently, we [34] and others [35] have shown that constituent additivity fails when the complex oxides have additional lattice dynamical features such as low-frequency optic modes associated with movement of complex polyhedra.…”

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

“…The empirical Neumann-Kopp's rule (NKR) is frequently used for estimation of unknown values of the heat capacity of mixed oxides [46][47][48]. According to NKR, heat capacity of a mixed oxide is calculated as a sum of heat capacities of the constituent binary ones…”