Giant negative electrocaloric effect in B-site non-stoichiometric (Pb_0.97La_0.02)(Zr_0.95Ti_0.05)_1+yO₃ anti-ferroelectric ceramics

Figures & data

Figure 1. XRD patterns of (Pb_0.97La_0.02)(Zr_0.95Ti_0.05)_1+yO₃ (PLZT2/95/5) (y = −0.03–0.03) ceramics measured at room temperature.

Figure 2. The temperature dependence of dielectric constant (ϵ_r) and inset of the T_o, T_c, and maximum dielectric constant of the PLZT2/95/5 ceramics at 10 kHz.

Figure 3. P-E hysteresis loops recorded at different temperatures under 50 kV/cm :(a) y = −0.03, (b) y = −0.01, (c) y = 0.01, and (d) y = 0.03. The inset of (a)–(d) shows the corresponding evolution of polarization versus temperatures of the PLZT2/95/5 ceramics under various electric fields.

Figure 4. (a) Temperature-dependent adiabatic temperature changes ΔT and in PLZT2/95/5 ceramics under 50 kV/cm with different compositions. (b)Temperature-dependent adiabatic temperature changes ΔT in PLZT2/95/5 ceramic with y = −0.01 under different electric fields.