Effect of the occupation of Pb and Ti sites on the structural, microstructural and dielectric properties of Y-doped PbTiO3 samples
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Pb1−xYxTiO3 and PbYxTi1−xO3 (x = 0, 2, 5, 8 and 10%) samples were produced using the sol gel process, and their structural, microstructural and dielectric properties investigated. X-ray diffraction results show that a relatively low temperature of calcination of the undoped sample was sufficient to obtain the pure tetragonal structure without the presence of any secondary phases, and that Y3+ ions may occupy both Pb and Ti sites in the PbTiO3 matrix. As a result of doping with Y3+ ions into both Pb and Ti-sites, a strong reduction of the grain size of the undoped sample was revealed by Scanning Electron Microscopy analysis. Relatively high values of the dielectric permittivity were obtained under doping with Y into Ti-sites compared to those recorded under doping into Pb-sites as revealed by dielectric measurements. These values are higher in the case of low Y3+ content. Moreover, dielectric measurements showed that the samples approach their frequency resonance, the latter depending on the temperature.
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