Journal
ADVANCED MATERIALS
Volume 34, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202204356
Keywords
energy-storage capacitors; ex; in situ multiscale structure evolution; lead-free relaxor ferroelectrics; nanograins; supercritical behavior
Categories
Funding
- National Natural Science Foundation of China [52072103, U19A2087]
- AHPU innovation team project [S022021058]
Ask authors/readers for more resources
Supercritical relaxor nanograined ferroelectrics demonstrate high-performance dielectric capacitors with record-high overall properties, showing high energy density and efficient charge-discharge performances.
Supercritical relaxor nanograined ferroelectrics are demonstrated for high-performance dielectric capacitors, showing record-high overall properties of energy density approximate to 13.1 J cm(-3) and field-insensitive efficiency approximate to 90% at approximate to 74 kV mm(-1) and superior charge-discharge performances of high power density approximate to 700 MW cm(-3), high discharge energy density approximate to 6.67 J cm(-3), and ultrashort discharge time <40 ns at 55 kV mm(-1). Ex/in situ transmission electron microscopy, Raman spectroscopy, and synchrotron X-ray diffraction provide clear evidence of the supercritical behavior in (Na,K)(Sb,Nb)O-3-SrZrO3-(Bi0.5Na0.5)ZrO3 ceramics, being achieved by engineering the coexistence of multiple local symmetries within the ergodic relaxor zone. The vanished difference between the ground relaxor state and the high-field supercritical state eliminates polarization hysteresis. The supercritical evolution with electric field enables a highly delayed polarization saturation with continuously increased polarization magnitudes. The results demonstrate that such a design strategy of compositionally induced and field-manipulated supercritical behavior can be generalizable for developing desirable energy-storage dielectrics for applications in ceramic/film capacitors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available