Mechanism of the phase formation in 65PMN-35PT
synthesized by a chemical method
L. P. S. Santos1, M. T. Fabbro1, E. R. Leite2, E. R. Camargo2
1
Departamento Acadêmico de Química, Instituto Federal de Educação, Ciência e Tecnologia
do Maranhão, Campus Monte Castelo, São Luís, MA, Brazil
2
Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, Brazil
This work reports the study on the synthesis of the solid solution 65Pb(Mg1/3Nb2/3)O3 –
35PbTiO3 (65PMN – 35PT) using combination of different synthesis methods, such as
columbite, partial oxalate and oxidant peroxo methods. The sample obtained was calcined in
different temperatures using microwave furnace. The thermal behavior of the 65PMN – 35PT
it was observed by the TG and DSC analysis. The evaluation of the phases presents was
followed by X-ray Diffraction (XRD) and Raman Spectroscopy. The results of XRD revealed
the existence of the phases tetragonal and monoclinic in a range temperature between 700 and
800 °C. Moreover, structure perovskite 65PMN – 35PT it was formed without the presence of
secondary phases or same of the phase of the type pyroclore. In this case, a model for the
formation of the structure perovskite 65PMN – 35PT was considered based in the
decomposition of lead oxalate in PbO, after that it occurs the crystallization of the PT
amorphous and reaction of PbO with MN forming PMN. In the next step, the reaction in the
solid state of PMN and PT crystalline for the formation of the solid solution 65PMN – 35PT.
Keywords: Synthesis, perovskite, monoclinic, pyroclore, oxidant peroxo methods.
This work was supported by the Brazilian research-financing institution: Conselho Nacional
de Desenvolvimento Científico e Tecnológico (CNPq).
[1] V. Bhat, B. Angadi, A. Umarji, Mat. Sci. Eng. B, 116, 131 (2005).
[2] E. R. Camargo, E. Longo, E. R. Leite, Sol-Gel Sci. Tech. 17, 111 (2000).
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