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Frenkel's liquid-phase sintering mechanism has essential influence on the   sintering of materials, however, by which only the initial 10% during   isothermal sintering can be well explained. To overcome this shortage,   Nikolić et al. introduced a mathematical model of shrinkage vs. sintering   time concerning the activated volume evolution. This article compares the   model established by Nikolić et al. with that of the Frenkel's liquid-phase   sintering mechanism. The model is verified reliable via training the height   and diameter data of cordierite glass by Giess et al. and the first-order   partial differential equation. It is verified that the higher the   temperature, the more quickly the value of the first-order partial   differential equation with time and the relative initial effective activated   volume to that in the final equibrium state increases to zero, and the more   reliable the model is

Interpretation of Frenkel’s theory of sintering considering evolution of activated pores: II. Model and reliability