Thermodynamic Assessment of the PZT System

Abstract

The thermodynamic assessment of the PZT system is carried out by the CALPHAD method. The thermodynamic properties of the phases are described using compound energy formalism CEF for the various solid phases and a solution model for the liquid. Three boundary systems PbO-ZrO 2 , PbO-TiO 2 and ZrO 2 -TiO 2 are reassessed based on the most recent experimental data, while the ternary PbO-TiO 2 -ZrO 2 system is modelled for the first time. Calculated phase diagrams are compared with the experimental data.

Fabrication and mechanical reinforcement of piezoelectric nanocomposites with ZrO2 nanoparticles embedded in situ

“…Possion's ratio was determined from the ratio of two successive resonant frequencies. [18,19], and the PZT/ZrO 2 piezoelectric ceramic composites are formed. The diffraction peaks characteristic of the PZT perovskite phase can be identified from the monolithic PZT and the composites, both the monoclinic and the tetragonal phases of ZrO 2 can be seen in the composites.…”

Photoluminescence in Doped PZT Ferroelectric Ceramic System

“…The samples doped with La+Nb have a grain size between 1 and 2 microns, in addition the contribution of the porosity is strong in the behavior of dielectric permittivity, being greater even for the composition 0.8. The factors that determined the variation of the permittivity with increasing dopant concentration are the grain size (Cancarevic et al, 2006) and porosity, fundamentally. …”

Thermodynamic Modeling of the ZrO2-YO1.5-TiO2 System

“…These parameters [12][13][14][15] used in the present work are summarized in Table I. The liquid phase is described by the substitutional solution model due to no observation of ordering or immiscibility.…”

“…The ZrO 2 -TiO 2 system has been assessed by three researchers [13,19,20] up to now. However, these assessments were based on the limited experimental data; thus, the phase relationship reported recently [21] cannot be reasonably described by their calculations, even including Cancarevic's assessment.…”

“…However, these assessments were based on the limited experimental data; thus, the phase relationship reported recently [21] cannot be reasonably described by their calculations, even including Cancarevic's assessment. [13] Cancarevic assessed this system using the new experimental data, [22][23][24] but few thermochemical data [25] were employed. In the current assessment, a set of new measured activity data of TiO 2 of the tetragonal and the monoclinic ZrO 2 solid solutions [11] are adopted.…”