Electron paramagnetic resonance of Cu2+ in PbTiO3

The electron paramagnetic resonance spectrum of Cu2+ in tetragonal-phase single-crystal lead titanate has been studied at 9.8 GHz. An axial spectrum with \g(parallel to)\ = 2.340(1) and \g(perpendicular to)\ = 2.058(1) was measured and fitted using the spin-Hamiltonian parameters \(63)A(parallel to)\ = 155(2) x 10(-4) cm(-1), \(63)A(perpendicular to)\ = 5.4(2.0) x 10(-4) cm(-1), \(65)A(parallel to)\ = 166(2) x 10(-4) cm(-1), and \(65)A(parallel to)\ = 5.8(2.0) x 10(-4) cm(-1). The observed g-values are consistent with a d(9)-configuration ion at a tetragonally distorted octahedral site from which it is inferred that Cu2+ substitutes at the Ti-site.