No abstract

Probing a lead-free ferroelectric with a large electrocaloric effect (ECE) and excellent temperature stability is a challenge in developing solid-state electrocaloric refrigeration. In this work, we constructed 0.93(Na 1/2 Bi 1/2 )TiO 3 -0.07[(1 − x)-BaTiO 3 -x(Nd 2/3 □ 1/3 )(Zn 1/3 Nb 2/3 )O 3 ] (NZN100x) lead-free ferroelectric ceramics by introducing A-site vacancies and B-site complex cations simultaneously. Direct electrocaloric measurement shows that, for x = 0.14, a high ΔT of 1.17 K was obtained at 45 °C under 5 kV/mm; meanwhile, the sample x = 0.20 gives a large ΔT of 0.91 K with a 10% variation in a wide temperature span (T span ) from 40 to 80 °C. The excellent ECE performance opens up a route for designing lead-free electrocaloric materials based on the synergic effect of composition design and defect engineering. KEYWORDS: (Na 1/2 Bi 1/2 )TiO 3 , lead-free ceramics, A-site vacancy, B-site complex cation, electrocaloric effect, temperature stability

No abstract

No abstract