Mechanism of phase formation in Pb(ZrxTi1-x)O3 synthesized by a partial oxalate method

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Leite, Edson R.
Cerqueira, Marinalva
Perazoli, Lenig A.
Nasar, Ricardo S.
Longo, Elson [UNESP]
Varela, José Arana [UNESP]
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The phase formation mechanism, as well as the morphotropic phase boundary, of lead zirconate titanate (PZT) processed by a partial oxalate method was investigated by simultaneous thermal analysis (TG-DTA) and by qualitative and quantitative X-ray diffraction (XRD). The results show that the ZrxTi1-xO2 (ZT) phase reacts with PbO forming the PZT phase without intermediate phases. XRD analysis showed the coexistence of rhombohedral and tetragonal phases for 0.47 ≤ x ≤ 0.55 with the phase boundary composition for x = 0.51. For low calcination temperatures, preferential formation of the PZT rhombohedral phase was observed. A model for phase formation of PZT by the partial oxalate method is proposed based on the existence of two interfaces of reaction (PbO-PZT and PZT-ZT) and diffusion of cations.
Calcination, Differential thermal analysis, Diffusion, Interfaces (materials), Ions, Phase composition, Phase transitions, Synthesis (chemical), Thermal effects, Thermogravimetric analysis, X ray diffraction, Calcination temperature, Lead zirconate titanate, Morphotropic phase boundary, Partial oxalate method, Phase formation, Rhombohedral phase, Simultaneous thermal analysis, Tetragonal phase, X ray fluorescence, Lead compounds
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Journal of the American Ceramic Society, v. 79, n. 6, p. 1563-1568, 1996.