G. Klotzsche et al., ELECTRON-PARAMAGNETIC-RESONANCE INVESTIGATIONS ON MANGANESE-DOPED PBTIO3 CERAMICS AND SINGLE-CRYSTALS, Ferroelectrics. Letters section, 15(5-6), 1993, pp. 115-120
The EPR spectra of manganese doped PbTiO3 ceramics and single crystals
reveal Mn4+ and Mn2+ incorporated in the oxygen octahedron. Mn4+ is l
ocated exactly at Ti4+ site whereas the position of Mn2+ is near to th
e centre of the oxygen octahedron. Both follow the collective motion o
f the Ti4+ sublattice. In case of additional doping with La3+ the Mn2 ion undergoes a thermally excited hopping with correlation times near
T(c) of the order of 10(-10) sec.