Giant negative electrocaloric effect in PbZrO_3/0.88BaTiO_3-0.12Bi(Mg_(1/2),Ti_(1/2))O_3 multilayered composite ferroelectric thin film for solid-state refrigeration

摘要

A giant negative electrocaloric (EC) effect in a PbZrO_3/(0.88BaTiO_3-0.12 Bi(Mg_(1/2),Ti_(1/2))O_3) (PZ/(BT-BMT)) multilayered composite ferroelectric (MCFE) thin film which is grown on Pt(111)/Ti/SiO_2/Si(100) substrates by the sol-gel method is investigated in this work. The negative EC effect in the PZ/(BMT-BT) MCFE thin film is greatly higher than that in the PZ AFE thin film with an adiabatic temperature change (ATC) ΔT = 1.5 K. The ATC ΔT of the PZ/(BMT-BT) MCFE thin film is -32 K under the applied electric field change ΔE = 1151 kV/cm. The result is conducive to enhance the EC refrigeration efficiency greatly.