“PAC investigation in the Zr-rich region of the PZT phase diagram”

R. E. ALONSO, A. P. AYALA, A. R. LÓPEZ GARCÍA AND J. A. EIRAS

La Plata, Argentina

Congreso; 35th Anniversary of the Hyperfine Interactions at La Plata; 2005

Instituto de Fisica La Plata

Previous studies using Perturbed Angular Correlation (PAC) spectroscopy in the PbZr1-xTixO3 (PZT) family of compounds show that whereas PbZrO3 is characterized by a single probes site with a very well defined hyperfine interaction, in PZT with x ³ 0.1 the probes occupy two distributed sites. In this work we investigate the Zr-rich region of the PZT phase diagram from x= 0.02 up to x = 0.08 using PAC in order to correlate the hyperfine parameters with the antiferroelectric-ferroelectric phase transition reported to occur at x= 0.05. Two static electric quadrupole interactions, one of them fairly distributed, were detected over the whole Ti concentration range, and an abrupt change in the hyperfine parameters for 0.02 < x < 0.04 is observed. The behaviour of these parameters and the existence of two probe sites is discussed. Keywords: PZT, PAC, Phase transitions, ferroelectric