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Enhancement of Energy Storage Performance by Criticality in Lead‐Free Relaxor Ferroelectrics
Author(s) -
Weyland Florian,
Zhang Haibo,
Novak Nikola
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201800165
Subject(s) - materials science , criticality , energy storage , ferroelectricity , phase diagram , range (aeronautics) , capacitor , condensed matter physics , relaxor ferroelectric , lead (geology) , phase transition , thermodynamics , phase (matter) , dielectric , optoelectronics , physics , voltage , power (physics) , quantum mechanics , nuclear physics , composite material , geomorphology , geology
In modern electronic systems and energy conversion, efficient capacitors with large energy densities are needed. Relaxor ferroelectrics show the potential to achieve those requirements. The lead‐free relaxor ferroelectric 0.852(Na 1/2 Bi 1/2 TiO 3 )–0.028(BaTiO 3 )–0.12(K 1/2 Bi 1/2 TiO 3 ) is investigated exhibiting the behavior of a wide range of Na 1/2 Bi 1/2 TiO 3 ‐based relaxor systems. The criticality of this system is analyzed and a full electric field–temperature phase diagram is constructed. The energy storage performance is determined from polarization measurements in a wide temperature range. It is found that energy density and especially the efficiency is largely increased in the vicinity of the critical end point of the relaxor system. The concept of criticality is widely applicable to lead‐based and lead‐free relaxor ferroelectrics and therefore an important approach to increase energy storage performance in those systems.