The Tx−Ts difference indicates the interdependence of the sintering and the crystallization phenomena, i.e., greater values of Tx−Ts correspond to less interdependence [16,17]. In this study, the Tx−Ts difference equals zero, which indicates that it was difficult for the investigated composition to achieve high levels of densification. Moreover, the DTA plot depicts two onsets of crystallization: Tc1at approximately 8501C andTc2at approximately 9251C.