fig2

Figure 2. Temperature dependence of (A) dielectric constant and (B) dielectric loss of BTC ceramics measured at 1 kHz; (C) Complex impedance spectra of BT, BC4T, and BTC4 ceramics measured at 200 °C; (D) The bias-field-dependent DC-bias stability coefficient (α) of BT, BC4T, and BTC4 ceramics; (E) P-E hysteresis loops and (F) corresponding I-E curves for BT, BC4T, and BTC4 ceramics. BTC: BaTi_100-xCa_xO₃; BT: BaTiO₃.