High discharge energy density in novel K1/2Bi1/2TiO3-BiFeO3 based relaxor ferroelectrics
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 (W<sub>dis</sub>) ~6.1 J cm<sup>−3</sup> with efficiency (η)~72% u...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2022
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| Summary: | 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 (W<sub>dis</sub>) ~6.1 J cm<sup>−3</sup> with efficiency (η)~72% under a pulsed field (E<sub>max</sub>) of 410 kV cm<sup>−1</sup> is reported along with temperature stability up to 150 °C (E<sub>max</sub> = 200 kV cm<sup>−1</sup>) for 0.5 K<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-0.42BiFeO<sub>3</sub>-0.08Sm(Mg<sub>2/3</sub>Nb<sub>1/3</sub>)O<sub>3</sub> (KBT-BF-SMN) bulk ceramics. The optimised composition is chemically heterogeneous but electrically homogenous, similar to several BiFeO<sub>3</sub>-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 E<sub>max</sub> and enhanced energy density. KBT-BF-SMN ceramics are therefore considered as promising candidates for pulsed power and power electronics applications. |
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