Structure of lead zirconium oxide: Evidence from NMR

Two different lead ion positions with tetragonal and orthorhombic local sym metry were revealed in PbZrO3 ceramics on the base of Pb-207 NMR spectra me asurements at room temperature. The obtained data and their analysis on the base of the spectra shape calculations are in agreement with a symmetry of Pbam nonpolar group space of PbZrO3. The comparison of observed spectra in PbTiO3 and PbZrO3 with calculated spectra allowing for resonance frequency chemical shift and spin-spin interaction show that the displacements of le ad and oxygen ions are not random quantities in the investigated PbZrO3 cer amic samples.