Ba‐based complex perovskite ceramics with superior energy storage characteristics

Abstract

Linear dielectrics are widely used to create high power capacitors, where it is a big challenge to achieve high energy storage density in such dielectrics. Here, Ba‐based complex perovskite ceramics with high dielectric strength, medium dielectric constant, and ultra‐low dielectric loss are proposed as the candidates for high energy storage density dielectric materials, and the significant effects of 1:2 B‐site ordering and ordering domain structure are systematically investigated. In Ba(Mg1/3Nb2/3)O3 ceramics, high dielectric strength of 1452 kV cm−1 combined with high energy storage density of 3.31 J cm−3 are achieved in the samples after post‐densification annealing, and they are 28% and 57%, respectively, higher than those in the as‐sintered samples. The significant enhancement of energy storage performance could be attributed to the increased B‐site ordering degree, and the uniform ordering domain structure. Furthermore, amorphous alumina thin films are introduced as the charge blocking layers, which significantly enhance the energy storage density to 5.09 J cm−3. The present work provides a new approach to develop the dielectric ceramics with high energy storage density.

Ordered domain engineering and physical property modification of Ba(Co1/3Nb2/3)O3 complex perovskite ceramics

“…In the previous work on Ba(Mg 1/3 Nb 2/3 )O 3 ceramics, the densification temperature was much lower than T o−d , thus the annealing temperature was designed far below T o−d in order not to decrease the bulk density of ceramics, which limited the enhancement of the ordering degree. 12 Different from Ba(Mg 1/3 Nb 2/3 )O 3 , the order-disorder transition temperature of Ba(Co 1/3 Nb 2/3 )O 3 is close to the densification temperature, which means it is possible to set the annealing temperature close to T o−d without reducing the density. Thus, significant variation of ordering degree as well as highly ordered state (ordering degree >0.90) can be expected.…”

“…The ordering degree is controlled by thermodynamic equilibrium, and the effects of the annealing process on the improvement of the ordering degree could be enhanced by increasing the annealing temperature close to the order‐disorder transition temperature, but it should be lower than the densification temperature since excessively high annealing temperature would lead to abnormal grain growth as well as the decrease of bulk density. In the previous work on Ba(Mg 1/3 Nb 2/3 )O 3 ceramics, the densification temperature was much lower than , thus the annealing temperature was designed far below in order not to decrease the bulk density of ceramics, which limited the enhancement of the ordering degree 12 . Different from Ba(Mg 1/3 Nb 2/3 )O 3 , the order‐disorder transition temperature of Ba(Co 1/3 Nb 2/3 )O 3 is close to the densification temperature, which means it is possible to set the annealing temperature close to without reducing the density.…”

“…Recently, further scientific attention has been extended toward the effects of ordering degree and ordered domain structure upon dielectric strength and energy storage characteristics of Ba‐based complex perovskite ceramics, and the enhanced dielectric strength and energy storage density were achieved in Ba(Mg 1/3 Nb 2/3 )O 3 ceramics with high ordering degree and fine ordered domain structure 12 . These results suggested a powerful approach for physical properties modification of 1:2 ordered Ba(M' 1/3 M'' 2/3 )O 3 complex perovskite ceramics by the means of so‐called ordered domain engineering.…”

Improving τf and thermal conductivity of Ba(Zn1/3Nb2/3)O3 microwave dielectric ceramics by ordered domain engineering

“…[7][8][9] Recently, the authors have proposed and developed the concept of ordered domain engineering for complex perovskite ceramics, and such process has been successfully used to improve a number of physical properties such as electric resistivity, thermal conductivity, dielectric strength, and energy storage density. [10][11][12] So-called ordered domain engineering contains three primary features: ordering degree, ordered domain size, and the ordered domain boundary type, and one can effectively modify the physical properties by designing and controlling the ordering degree and ordered domain structures through controlling the densification and annealing processes based on the relationship between densification temperature and orderdisorder transition temperature (T o−d ). 11 On the other hand, with the rapid development of mobile communication toward 5G, more superior microwave dielectric characteristics especially ultra-high Q value combined with near-zero temperature coefficient of resonant frequency (𝜏 f ) are urgently required for dielectric resonator materials.…”

High-Performance Dielectric Ceramic for Energy Storage Capacitors

“…in the ceramics, and the interface structure will also affect the polarization, breakdown, and even domain motion of the ceramic. Many methods have been proposed for significantly optimizing the ESP of dielectric ceramics, including the introduction of a polymorphic phase boundary [13], doping with a relaxor ferroelectric phase [14], the formation of a fine-grain structure [15], the combination of the phases with different electric characteristics [16], and the construction of a core-shell structure [17], as well as adopting different sintering techniques [18].…”