Dielectric temperature stability and energy storage performance of B-site Sn4+-doped BNKBST ceramics

Dong, Guangzhi; Fan, Huiqing; Jia, Yuxin; Liu, Huan

doi:10.1007/s10854-020-03918-2

Cited by 11 publications

(1 citation statement)

References 51 publications

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“…To quantitatively characterize the relaxor behavior of the ceramics, the modified Curie–Weiss law was used to calculate the degree of relaxation characteristic or the degree of diffuseness (γ) which could be expressed by the following equations: where γ represented the dielectric relaxation factor which lie between 1 and 2, and ε m represented the maximum dielectric constant. The value of γ equal to 1 represents a normal ferroelectric transition whereas a γ value equal to 2 represents a relaxor ferroelectric transition 33 . The relationship between ln(1/ε r − 1/ε m ) and ln(T − T m ) of the ceramics was displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

Titanate-based high-entropy perovskite oxides relaxor ferroelectrics

Bunpang,

Singkammo,

Cann

et al. 2024

Sci Rep

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Different combinations of monovalent and trivalent A-cations in high-entropy perovskite oxides (HEPOs) were investigated. The multicomponent (A′0.2A″0.2Ba0.2Sr0.2Ca0.2)TiO3 (A′ = Na+, K+, A″ = Bi3+, La3+) perovskite compounds were successfully synthesized by solid-state reaction method persisting average cubic perovskite phase. The trivalent cation exhibited distinct effects on local structure, dielectric properties and relaxor ferroelectric behavior. Highly dense ceramics (> 95%), high dielectric constant (~ 3000), low dielectric loss (~ 0.1), and relaxor ferroelectric characteristics were obtained in the compound containing Bi3+. The La3+ containing compounds revealed lower dielectric constant, higher dielectric loss and linear dielectric behavior. The effect of monovalent cation on the dielectric properties was minimal. However, it affected relaxor ferroelectric behavior at elevated temperatures and conduction behavior at high temperatures. The (K0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic maintained the relaxor ferroelectric behavior with low PREM at high temperatures suggesting more stable relaxor ferroelectric characteristics than that of the (Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3. Moreover, between these two compounds, the homogeneous electrical characteristics could be obtained from the compound consisting of K + and Bi + at A-site. This study suggests that tuning the chemical composition, particularly choosing appropriate combination of mono/trivalent cations in high entropy perovskite oxides, could be the effective approach to develop high-performance relaxor ferroelectrics with the desired properties.

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Section: Resultsmentioning

confidence: 99%