Fe3+ defect dipole centers in ferroelectric PbTiO3 studied using electron paramagnetic resonance
Journal Article
Smotrakov2, D. J. Keeble,1,* M. Loyo-Menoyo,1 Z. I. Y. Booq,1 R. R. Garipov,1 V. V. Eremkin,2 and V. . 2009
Publication Work Type:
Scholar paper
Magazine \ Newspaper:
PHYSICAL REVIEW B 80, 014101 2009
Issue Number:
80
Volume Number:
014101
Pages:
014101-1-014101-7
Publication Abstract:
Three Fe3+ centers with tetragonal symmetry and with the defect axis parallel to the polarization direction were detected in ferroelectric PbTiO3 crystals using electron paramagnetic resonance. All exhibit large zerofield splittings ZFS. Two are assigned to Fe3+-oxygen vacancy dipole defect complexes, and the third to the isolated Fe3+ with distant charge compensation. The Fe3+-VO defect with the largest ZFS converts to the second stable center on annealing; comparison of the cubic ZFS terms show the in-plane oxygen ligands relax
outwards in stable center.