Large Room-Temperature Electrocaloric Effect in Lead-Free Relaxor Ferroelectric Ceramics with Wide Operation Temperature Range.

ABSTRACT: In order to obtain large room-temperature electrocaloric effect (ECE) and wide operation temperature range simultaneously in lead-free ceramics, we proposed designing a relaxor ferroelectric with a T_m (the temperature at which the maximum dielectric permittivity is achieved) near-room temperature and glass addition. Based on this strategy, we designed and fabricated lead-free 0.76NaNbO₃-0.24BaTiO₃ (NN-24BT) ceramics with 1wt.% BaO-B₂O₃-SiO₂ glass addition, which showed distinct relaxor ferroelectric characteristics with strongly diffused phase transition and a T_m near-room temperature. Based on a direct measurement method, a large ΔT (adiabatic temperature change) of 1.3 K was obtained at room

SUBMITTER: Zhao X 

PROVIDER: S-EPMC11547186 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature