Giant isothermal entropy change In (111)-oriented PMN-PT thin film

摘要

An isothermal entropy change of 240 nm (111)-oriented PMN-PT 65/35 film near the ferroelectric Curie temperature, relative cooling power (RCP) and change of heat capacity have been investigated. The extracted data characterized giant isothermal entropy change of more than 16 J/kg K in electric field shift ΔE of 455 kV cm~(-1), which is nearly twice than that found for PbZr_(0.95)Ti_(0.05)O_3 thin film at 492 kV cm~(-1) near the Curie point. Furthermore, the RCP ≈ 700 J/kg and change of heat capacity ≈ 233 J/kg K in electric field shift ΔE of 747 kV cm~(-1).