Bulg. J. Phys. vol.32 no.1 (2005), pp. 45-50

Polarization Processes in PZT Ceramics

V. D. Parvanova1, M. M. Nadoliisky2
1Deptment of Inorganic Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridsky Street, 1756 Sofia, Bulgaria
2Department of Physics, University of Architecture, Civil Engineering and Geodesy, 1 Hristo Smirnensky Blvd., 1421 Sofia, Bulgaria
Abstract. This paper studies the conditions for effective polarization of two compositions of PZT ceramics. The dependence of εr, tan δ, planar coupling factor Kr and the piezoelectric constant d31, d33, g31, g33 on the polarizing DC-field is investigated. The values have been established of the polarizing DC field, where the ceramics demonstrates maximum piezoelectric properties. Pb0.94Ca0.04Mg0.02Zr0.53Ti0.47O3+ 0.4% B2O3 shows properties common for the ferrohard materials. Pb0.94Sr0.04Mg0.02Zr0.53Ti0.47O3+ 0.4% 5B2O3 can be referred to the ferrosoft materials.

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