Greatly enhanced energy storage and discharge properties of AgNbO₃ ceramics with a stable antiferroelectric phase and high breakdown strength using hydrothermally synthesized powders

Abstract

AgNbO3 lead-free antiferroelectric (AFE) material has been one of the most promising candidates for fabricating dielectric capacitors due to their near-zero remnant polarization and good environmental friendliness. However, current AgNbO3...

Multi-scale synergic optimization strategy for dielectric energy storage ceramics

“…On the one hand, the reduction of the grain size increases the content of grain boundaries with high resistivity, which improves the dielectric breakdown resistance. On the other hand, the breakdown path of the electrical tree is more complex in fine-grained ceramics, and dielectric breakdown requires higher energy [22,[73][74][75].…”

“…As a result, the leakage current decreases in fine-grain ceramics, beneficial to a large E b [25]. Up to now, many methods have been successfully utilized in ceramics to reduce grain sizes, such as high-energy ball milling [29,73], novel sintering method [74,[163][164][165], and hydrothermal synthesis [21,22,27,75].…”

“…A phase field model, which is used to simulate the spatial distribution of electric potential and electric breakdown paths, also indicates that the smaller grain size of AN ceramics prepared via the hydrothermal method (Figs. 21(d) and 21(e)) and the more breakdown-resistant grain boundaries lead to more energy consumption in the propagation of electrical trees [21,28,75,180]. Huang et al [75] reported the synthesis of AN ceramics with a grain size of ~1.08 μm using the hydrothermal synthesized powders.…”

“…21(d) and 21(e)) and the more breakdown-resistant grain boundaries lead to more energy consumption in the propagation of electrical trees [21,28,75,180]. Huang et al [75] reported the synthesis of AN ceramics with a grain size of ~1.08 μm using the hydrothermal synthesized powders. The fine-grain size leads to the increment in E b up to 273 kV/cm.…”

Simultaneously increased discharged energy density and efficiency in bilayer-structured nanocomposites with AgNbO3 lead-free antiferroelectric nanofillers

“…27 AgNbO 3 (AN) AFE has been considered as the best candidate filler for fabricating nanocomposites with excellent capacitive properties benefiting from its high D max of ∼50 μC cm −2 , low D r and environment friendliness. 28 However, so far, the energy storage properties of AgNbO 3 AFEs/polymer composites have not been reported.…”