Thermal analysis of the seeded lead zirconate titanate sol–gel system

Effect of drying temperature on structure, phase transformation of sol–gel-derived lead zirconate titanate powders

“…It is well known that as the heating rate increases, the peaks shift to the higher temperatures [25]. According to the Kissinger's formula [27,28], the activation energies can be estimated. The activation energies (E a ) for various reactions were calculated from the linear regression of the Kissinger's formula, as shown in equation (1), when the heating rates were 2.5, 5, 10 and 20 • C/min [27,28],…”

Synthesis and thermal stability of perovskite PbZr0.52Ti0.48O3 (PZT) powders via precipitation routes

“…To the twostage precipitation route, however, the powder calcined at the temperature over 500°C only contains perovskite PZT phase but for PbO phase. Two broad peaks of pyrochlore obviously appear at the XRD patterns of the PZT powder calcined at low temperature as 500 or 550°C, which demonstrates that the formation of perovskite PZT phase follows a consecutive mechanism [11,12] and illustrate why there two exothermic peaks related to the crystallization appear on the DTA curve. Figure 3 shows the TG curves of the PZT powders obtained by calcined the coprecipitation PZT precursor at 500 or 550°C, and by calcined the two-stage precipitation PZT precursor at 500°C for 2 h, respectively.…”

Citrate-oxide method to prepare SrBi4Ti4O15 powders and ceramics

“…The largest exothermic peak at 330 • C in DSC plots was assigned to the decomposition of the citrate. The second exothermic peak at 395 • C was associated with the decomposition of residual organics and phase transformation into the desired phase [22]. Corresponding to the DSC, there were two stages in the TG plot: one was from 30 to 355 • C in which the weight of gel lost 35.5% and another was from 355 to 550 • C with the weight loss of 50.2%.…”