We report a large and nonvolatile bipolar-electric-field-controlled magnetization at room temperature in a Co(40)Fe(40)B(20)/Pb(Mg(1/3)Nb(2/3))(0.7)Ti(0.3)O(3) structure, which exhibits an electric-field-controlled looplike magnetization. Investigations on the ferroelectric domains and crystal structures with in situ electric fields reveal that the effect is related to the combined action of 109° ferroelastic domain switching and the absence of magnetocrystalline anisotropy in Co(40)Fe(40)B(20). This work provides a route to realize large and nonvolatile magnetoelectric coupling at room temperature and is significant for applications.
Dielectric capacitors with high energy storage performance are in great demand for emerging advanced energy storage applications. Relaxor ferroelectrics are one type dielectric materials possessing high energy storage density and energy efficiency simultaneously. In this study, 0.9(Sr0.7Bi0.2)TiO3–0.1Bi(Mg0.5Me0.5)O3 (Me = Ti, Zr, and Hf) dielectric relaxors are designed and the corresponding energy storage properties are investigated. The excellent recoverable energy density of 3.1 J/cm3 with a high energy efficiency of 93% is achieved at applied electric field of 360 kV/cm for 0.9(Sr0.7Bi0.2)TiO3–0.1Bi(Mg0.5Hf0.5)O3 (0.9SBT–0.1BMH) ceramic. High breakdown strength of 460 kV/cm in 0.9SBT–0.1BMH ceramic is obtained by Weibull distribution with satisfied reliability. In addition, 0.9SBT–0.1BMH shows outstanding thermal stability of energy storage performance up to 200°C, with the variation being less than 5%, together with satisfying cycling stability and high charge‐discharge rate, making the 0.9SBT–0.1BMH ceramic a potential lead‐free candidate for high power energy storage applications at elevated temperature.
Sodium niobate (NaNbO3)-based lead-free ceramics have
been actively studied for energy storage applications because of their
antiferroelectric and/or relaxor features achieved in modified systems.
The P–E loops of NaNbO3-based ceramics are usually hysteretic because of the existence
of a metastable ferroelectric phase at room temperature. In this study,
by introducing aliovalent cations and A-site vacancies, the relaxor
characteristics are greatly enhanced in (Na1–2x
Bi
x
)(Nb1–x
Zr
x
)O3 ceramics,
leading to a high energy storage efficiency of above 90%. In addition,
sintering aid CuO and a special ramp-to-spike sintering profile were
employed to decrease the sintering temperature and reduce the grain
size. The modified ceramic exhibits improved insulating properties
and hence a higher breakdown strength, leading to a high recoverable
energy density of 4.9 J/cm3 and a high energy efficiency
of 88% at 430 kV/cm. The ceramic also exhibits satisfactory temperature
stability over a wide temperature range from 25 to 125 °C and
charge–discharge performance, making it a promising candidate
for high-power dielectric energy storage applications.
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