Abstract
The intensity of the EPR signal with g = 5.985 arising from a ferric ion — oxygen vacancy defect pair (Fe 3+ — V O) in PbTiO 3, varies with the extent of PbO nonstoichiometry at constant Fe 3+ content due to an increased oxygen vacancy concentration. In PZT solid solutions, the signal intensity decreases with an increase in Zr. A lower intensity is also noticed for Fe 3+ — V O signals in PbZrO 3. This behaviour is explained on the basis of PbO nonstoichiometry arising from independent Pb- and O-vacancies as well as the randomly distributed crystallographic shear (CS) plane defects. The contribution to PbO nonstoichiometry from CS planes is larger in high zirconium compositions of PZT.
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