%0 Journal Article
%T Coexistence of Large Negative and Positive Electrocaloric Effects and Energy Storage Performance in LiNbO3 Doped K0.5Na0.5NbO3 Nanocrystalline Ceramics
%J -
%D 2019
%R https://doi.org/10.1021/acsaelm.9b00033
%X The electrocaloric effect (ECE) has been investigated in (1 ¨C x)K0.5Na0.5NbO3¨CxLiNbO3 (KNN-xLiN) nanocrystalline ceramics with compositions in the range of 0.01 ¡Ü x ¡Ü 0.05 by the indirect measurement using Maxwell¡¯s approach. The coexistence of the negative and positive ECEs has been achieved in all samples. The maximum values of negative and positive ECE were found to be £¿0.40 and 0.24 K for x = 0.01, £¿0.23 and 0.18 K for x = 0.03, and £¿0.13 and 0.29 K for x = 0.05, respectively. The maximum recoverable energy densities were found to be 0.12, 0.13, and 0.128 J/cm3 with energy storage efficiencies of 30, 50, and 51% at an electric field of 45 kV/cm for x = 0.01, 0.03, and 0.05, respectively. The coexistence of the negative and positive ECEs with a high recoverable energy density in one material makes it a promising candidate for highly efficient, environmentally friendly cooling devices and energy-storage device applications
%U https://pubs.acs.org/doi/10.1021/acsaelm.9b00033