Issue: 2(22), 2012. Series: Multi-Topic

THE STRUCTURE OF THE MODIFIED PIEZOCERAMICS BASED ON THE LEAD ZIRCONATE-TITANATE AT MEZO, MICRO AND NANO LEVELS

UDK: 537.333

Galiyarova N. M., Strelyaeva A. B.

The microstructure of PZTNB-1 piezoceramics (the lead-zirconate-titanate solid solutions doped with sodium and bismuth) has been studied in the morphotropic phase boundary region of tetragonal and rhombohedral phases. The research has been carried out with the help of optic and atomic-force microscopy (AFM) methods. On the basis of the analysis of optic images the sizes and shape parameters of grains and pores were determined and their distribution functions were studied. The correlation dependences between squares and perimeters were revealed. They justify statistic similarity of the microstructure. Local and global fractal dimensionalities of grain boundaries were determined. The received values considerably exceed topological dimension of a line due to fracture of the boundaries. The global fractal dimensionality of PZTNB-1 corresponds to the model of triangular Serpinsky gasket. Roughness of grains surface and pores’ bottom, fracture of rugged boundaries, domain structure of the grains have been studied by AFM method. The details of the relief of pores’ bottom were revealed, the depth of grain interfaces was evaluated. The domain structure of grains with average width of domains about 100 nm has been visualized. The domain nucleuses were found on the pores’ bottom.