Ferroelectric domain structures and their dynamic behavior of La-doped lead magnesium niobate-lead titanate [Pb(Mg113Nb213)03-xPbTiO3 (PMN-PT)] transparent ceramics under an external in-plane electric field are investigated by piezoresponse force microscopy (PFM). A remarkable effect of La doping on the domain configurations and domain kinetic behavior in La-doped PMN-PT transparent ferroelectric ceramics were found by PFM. For most compositions the switching behavior of domain structures shows a normal evolutionary trend, while for some certain composition anisotropic polarization switching dynamics were observed in macrodomain regions under in-plane bias in the La-doped PMN-PT transparent ceramics. (C) 2014 Elsevier B.V. All rights reserved.