High strain and high energy density of lead-free (Bi0.50Na0.40K0.10)0.94Ba0.06Ti(1−x)(Al0.50Ta0.50)xO3 perovskite ceramics

0.90(0.88NaNbO3-0.12Bi(Ni0.5Zr0.5)O3)-0.10CaTiO3 Lead-Free Dielectric Ceramics with High Energy Storage Properties

“…The maximum polarization of the sample decreases from 12.083 to 11.548, while the residual polarization is in the range of 0.7–1.4. The frequency stability of the sample is excellent and has a good prospect in market application. − The temperature increases from 30 to 70 °C, the maximum planned strength and the residual polarization of the sample increase at the same time, and the difference between the two decreases gradually, as shown in Figure d–f. The energy storage density and efficiency decrease to 1.1 J/cm 3 and 47%, respectively.…”

“…It can be clearly seen that with the increase of CT content, the dielectric constant of the sample gradually decreases, which is consistent with the ferroelectric analysis of the sample. The dielectric constant of each component sample remains basically unchanged at different frequencies, indicating that (1- x )­(0.88NN-0.12BNZ)- x CT can maintain relatively stable dielectric properties at different operating frequencies, which has the potential to be applied in the field of pulsed electronic components …”

“…The remanent polarization is caused by the fact that some of the electric domains of the sample cannot be restored after turning and still remain in the polarization direction. Therefore, as the applied electric field intensity increases, the energy storage efficiency of the sample gradually decreases …”

“…The dielectric constant of each component sample remains basically unchanged at different frequencies, indicating that (1-x)(0.88NN-0.12BNZ)-xCT can maintain relatively stable dielectric properties at different operating frequencies, which has the potential to be applied in the field of pulsed electronic components. 36 The energy storage characteristics of (1-x)(0.88NN-0.12BNZ)-xCT ceramics are shown in Figure 4. With the increase of CT content, the area enclosed by the hysteresis loop gradually decreases, and the remanent polarization (P r ) decreases, indicating that the energy storage efficiency of the sample increases, which achieves our goal of incorporating linear energy storage material CaTiO 3 , as shown in Figure 4a− c. Since the non-equivalent substitution destroys the longrange ordered structure, the maximum polarization intensity (P max ) and P r of the sample gradually decrease, 12 which is consistent with the results of Raman spectroscopy.…”

Enhanced energy storage properties of KNbO3 modified (Bi0.5Na0.5)TiO3–BaTiO3 based lead-free relaxor ferroelectric ceramics

“…The Raman spectra of all samples are consistent with the literature and can be classified into four vibrational modes. 24 The mode with wavenumbers r200 cm À1 corresponds to the vibration of A-site ions, and the slight fluctuation of the V 1 peak is attributed to the disordered distribution of A-site ions. 25 The mode of 200-400 cm À1 is correlated with the vibration of B-O.…”