Abstract:Lead-free (1-x)(0.4BiScO 3-0.6BaTiO 3)-x(Bi 0.5 Na 0.5)TiO 3 (BSBT-xBNT) ceramics were prepared by traditional ceramics preparation method. The energy storage characteristics, as well as dielectric spectrum curves of BSBT-xBNT ceramics, were systematically used in research. The ternary system formed perovskite solid solution with dense and homogenous microstructure. BSBT-xBNT ceramics exhibited slimmer and slanted hysteresis loops followed by higher saturation polarisation (P max) and lower remnant polarisatio… Show more
“…In contrast, the KB ceramic in Fig. 9 b displayed a single semicircle and decreased as the temperature increased, indicating a decrease in the DC resistivity 40 . Figure 9 Complex impedance plot between the imaginary part (Z″) and the real part (Z′) of ( a ) NB and ( b ) KB ceramics in the temperature range of 400 °C–500 °C.…”
Section: Resultsmentioning
confidence: 90%
“…10 . The semi-log plots of normalized Z′′ and normalized M′′ as a function of frequency showed multiple peaks that relate to the transport and relaxation processes 40 . In Fig.…”
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.
“…In contrast, the KB ceramic in Fig. 9 b displayed a single semicircle and decreased as the temperature increased, indicating a decrease in the DC resistivity 40 . Figure 9 Complex impedance plot between the imaginary part (Z″) and the real part (Z′) of ( a ) NB and ( b ) KB ceramics in the temperature range of 400 °C–500 °C.…”
Section: Resultsmentioning
confidence: 90%
“…10 . The semi-log plots of normalized Z′′ and normalized M′′ as a function of frequency showed multiple peaks that relate to the transport and relaxation processes 40 . In Fig.…”
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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