Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 22, Pages 11414-11423Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00216j
Keywords
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Funding
- Engineering and Physical Sciences Research Council [EP/L017563/1, EP/N010493/1]
- Henry Royce Institute for Advanced Materials
- EPSRC [EP/R00661X/1, EP/S019367/1, EP/P02470X/1, EP/P025285/1]
- National Natural Science Foundation of China [51602060, 51402005]
- Functional Materials and Devices group from University of Sheffield
- EPSRC [EP/L017563/1, EP/S019367/1, EP/N010493/1, EP/P015859/1, EP/N032233/1, EP/P02470X/1] Funding Source: UKRI
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The critical role of electrical homogeneity in optimising electric-field breakdown strength (BDS) and energy storage in high energy density (0.7 -x)BiFeO3-0.3BaTiO(3)-xBi(Li0.5Nb0.5)O-3(BF-BT-xBLN) lead-free capacitors is demonstrated. The high BDS for bulk ceramics and multilayers (dielectric layer thickness similar to 8 mu m) of similar to 260 and similar to 950 kV cm(-1), respectively, gives rise to record-performance of recoverable energy density,W-rec= 13.8 J cm(-3)and efficiency,eta= 81%. Under an electric field of 400 kV cm(-1), multilayers are temperature stable up to 100 degrees C, frequency independent in the range 10(-2)to 10(2)Hz, have low strain (<0.03%) and are fatigue-resistant up to 10(4)cycles (W(rec)variation < 10%). These properties show promise for practical use in pulsed power systems.
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