Ce-dopedBaTiO3(BTO) films were grown by pulsed laser deposition. Highlyc-axis-orientedBTO:Ce/YBa2Cu3O7−xbilayer structures on aSrTiO3(100) substrate were fabricated for electrical property characterization. Typical hysteresis and butterfly typeC–Vplots were observed. The remanent polarization and coercive field are 3&mgr;C/cm2and 20 kV/cm, respectively. Highlya-axis-oriented Ce-doped and undoped BTO films were also deposited on MgO(100) substrates. Their linear and quadratic electro-optic effects were measured and compared. The Ce-doped films showed a larger linear electro-optic coefficient and obvious hysteresis in the quadratic electro-optic coefficient. ©1997 American Institute of Physics.