Electron Spin Resonance of Mn2+ in Lead Titanate

The electron spin resonance (ESR) study has been made for cubic and tetragonal lead titanate (PbTiO 3 ) doped with manganese ion. The signals were observed in the ceramics fired in nitrogen atmosphere, whereas both for the ceramics fired in air and for single crystals any ESR signal due to substitutional Mn 2+ was not observed. Mn 2+ in PbTiO 3 is considered to be located at the titanium site in the unit cell. The spin Hamiltonian parameters obtained are as follows: in tetragonal phase g ⊥ =2.084±0.002, D =+(502±4)×10 -4 cm -1 , a =+(43±2)×10 -4 cm -1 , A x (= A y )=-(82±1.5)×10 -4 cm -1 , in cubic phase g =1.996±0.002, A x (= A y = A z )=-(79.8±0.5)×10 -4 cm -1 . The ratio between the values of D in PbTiO 3 and BaTiO 3 is in rough agreement with the ratio between the strengths of their axial crystalline field.