High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics

WANG, X., FAN, Y., ZHANG, Bin, MOSTAED, A., LI, L., FETEIRA, Antonio, WANG, D., SINCLAIR, D.C., WANG, G. and REANEY, I.M. (2022). High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics. Journal of the European Ceramic Society, 42 (15), 7381-7387.

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Official URL: https://www.sciencedirect.com/science/article/pii/...
Open Access URL: https://www.sciencedirect.com/science/article/pii/... (Published version)
Link to published version:: https://doi.org/10.1016/j.jeurceramsoc.2022.08.020
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    Abstract

    An increasing number of new dielectrics are being reported for the development of next-generation ceramic capacitors for power electronics used in clean energy technologies. Here, high discharge energy density (Wdis) ~6.1 J cm−3 with efficiency (η)~72% under a pulsed field (Emax) of 410 kV cm−1 is reported along with temperature stability up to 150 °C (Emax = 200 kV cm−1) for 0.5 K0.5Bi0.5TiO3-0.42BiFeO3-0.08Sm(Mg2/3Nb1/3)O3 (KBT-BF-SMN) bulk ceramics. The optimised composition is chemically heterogeneous but electrically homogenous, similar to several BiFeO3-based dielectrics reported previously and adding to the growing body of evidence that electrical (measured at weak-field) not chemical homogeneity is the best guide to increased Emax and enhanced energy density. KBT-BF-SMN ceramics are therefore considered as promising candidates for pulsed power and power electronics applications.

    Item Type: Article
    Uncontrolled Keywords: 0912 Materials Engineering; Materials
    Identification Number: https://doi.org/10.1016/j.jeurceramsoc.2022.08.020
    Page Range: 7381-7387
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 21 Sep 2022 12:02
    Last Modified: 21 Sep 2022 12:03
    URI: http://shura.shu.ac.uk/id/eprint/30725

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