Effect of Pb(Zn1/3Nb2/3)O3 addition on structural, dielectric, Raman, and ferroelectric properties of BaTiO3 ceramics; pp. 409a??415

摘要

A (1-x)BaTiO3a??xPb(Zn1/3Nb2/3)O3 ((1-x)BTa??xPZN) system with a low content of PZN (x = 0, 0.025, and 0.05) was prepared by the spark plasma sintering process. X-ray diffraction analysis exhibited that the obtained specimens possessed the perovskite structure with tetragonal symmetry and underwent a sequence of phase transformations characteristic of pure BT. The microstructure study showed a dense structure in good agreement with that of above 95% relative density determined by the Archimedes method. Dielectric measurements revealed that the maximum of electric permittivity was broadened and shifted after the PZN doping of BT. The Raman spectra were similar for all samples in agreement with the X-ray data. It was shown that the PZN doping of BT caused a worsening of ferroelectric properties. The obtained results are discussed in terms of an increased degree of crystal structure disorder, which creates local elastic and electric fields. The investigated ceramics are considered to be a good starting point for low-lead electronic materials.