عنوان مقاله [English]
In this research, the effects of Lanthanum and Niobium oxides on the microstructure and electrical properties of a solid solution
of lead Titanate Zirconate Piezoelectric Ceramics were studiedin the morphotropic regions, with a composition of Pb1.1(Zr0.53Ti0.47)O3.Samples were prepared via a conventional ceramic procedure andthe Lanthanum oxide content was in the range of 0-3 %.The results showed that, in the sample with mole 2% Lanthanumoxide, the densification and sintering were improved at 12000C.Although both cations are in the Lantanate group and, usually,therefore, must act as donor type additives, the difference in the atomic radii caused different behavior. It would seem thatLa is more compatible with the structure and has more solubility.With more La, the second phase was observed, which created sometension. This cannot be compensated for by the tetragonalityof the system. Besides which, Lanthanum oxide reduces the grain size distribution of the system. Regarding the effects of Nd, these effects were started at lower amounts, but, its effect on the density was not significant.The electrical measurements indicated improvements up to mole2% of the additives and a reduction thereafter.