Formation of magnetic grains in ferroelectric Pb[Zr_(0.6)Ti_(0.4)]O_3 ceramics doped with Fe_(3+) above the solubility limit

摘要

The effect of excess iron-doping in piezoelectric lead-zirconate-titanate (PZT) on the microstructure was investigated by means of transmission electron microscopy in conjunction with electron diffraction and energy dispersive x-ray spectroscopy analysis. Electron paramagnetic resonance (EPR) spectroscopy has been used to characterize the site of the iron functional centers. A crystalline secondary magnetic phase formed upon sintering, magnetoplumbite (PbFe_(13)O_(19)), has been unequivocally identified. Furthermore, the phase assemblage observed in the Fe~(3+)-doped PZT 60/40 sample could be correlated with an exchange-coupled resonance in the EPR spectra.