Investigation on high energy storage properties in La3+-doped 0.88PMN-0.12PT relaxor ferroelectric films

Relaxor ferroelectric Pb 1-x La x (Mg 1/3 Nb 2/3 ) 0.88 Ti 0.12 O 3 (P 1-x L x MNT, x = 0.00, 0.01, 0.02, 0.03) films with pure perovskite structure are successfully deposited onto Pt(111)/Ti/SiO 2 /Si substrate by sol-gel process. Note that donor doping for P 1-x L x MNT ( x = 0.01∼0.03) allows the change of P - E loop from the slanted feature to the square characteristic. Under the condition of the identical electric field and larger P max - P r value, relatively lower recoverable energy storage density ( W rec ) is obtained with the loss ( η ) of small difference resulting from slim P - E loop. While, the largest W rec of 25.2 J/cm 3 and η of 63.2% are obtained in the relaxor P 0.98 L 0.02 MNT film, which are strongly dependent on the raised breakdown strength ( E BD = 2947.2 kV/cm), larger difference between the maximum and remnant polarization (Δ P = 29.6 μC/cm 2 ). This study provides a newfangled guidance for tailoring the energy storage performance of the materials by doping effect.