Evolution of the electrical properties of K0.5Bi0.5TiO3 as a result of prolonged sintering

König, Jakob; Suvorov, Danilo

doi:10.1016/j.jeurceramsoc.2015.04.003

Cited by 35 publications

(19 citation statements)

References 32 publications

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“…These results are consistent with previous reports for the end members of the solid solution, BCZT and KBT, both of which exhibit a well-saturated ferroelectric loop at room temperature [40][41][42]. However, the intermediate compositions yielded slim P-E loops that are tilted strongly with respect to the polarisation axis, giving rise to greatly reduced Pr and Ps values.…”

Section: Ferroelectric Propertiessupporting

confidence: 92%

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Al-Aaraji

Hall

2018

Journal of the European Ceramic Society

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Section: Ferroelectric Propertiessupporting

confidence: 92%

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Al-Aaraji

Hall

2018

Journal of the European Ceramic Society

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“…All configurations, except the layer-001, yield larger P s than the range of experimental values. In contrast, the Berry phase calculated P s for the experimental structure 37 is 30 µC/cm 2 , which is well within the grey region depicting the range of reported values 17,19,23 . The analogue material BNT has a reported experimental polarization of 38 µC/cm 2 50 , and Berry phase calculations of P s from a fully relaxed rhombohedral R3c unit cell structure gave a value of 62.6 µC/cm 2 .…”

Section: A Dft Analysissupporting

confidence: 78%

Local Structure of Disordered Bi_0.5K_0.5TiO₃ Investigated by Pair Distribution Function Analysis and First-Principles Calculations

2017

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We investigate A-site cation ordering in the ferroelectric perovskite Bi 0.5 K 0.5 TiO 3 (BKT) by Density Functional Theory (DFT) calculations and synchrotron X-ray total scattering. Using BKT as a prototypical lead-free ferroelectric perovskite with mixed A-site cations, we use a combination of theory and experiments to assess the energetics and resulting physical properties of cation ordering. Ten different Bi/K configurations in a 2×2×2 supercell were assessed by real space pair distribution functions (PDF) and DFT calculations. None of these configurations were identified as particularly favourable from experiment or theory. Ferroelectric polarization calculated by the Berry phase method for all ten configurations yield values of 50-105 µC/cm 2 . This is significantly larger than previously reported experimental results in the range of 22-49 µC/cm 2 , indicating that BKT does not possess long range A-site cation order. Reverse Monte Carlo (RMC) modelling of the total scattering data with a 12×12×12 supercell also supports substantial A-site disorder in BKT. A 4×4×4 supercell with local cation displacements in a pseudo-disordered A-site sublattice reproduces the experimentally observed polarization, implying that in a real material there are multiple local polar regions which partly cancel each other. The combination of RMC modelling of PDFs with DFT calculations should be highly applicable to other crystalline materials with sublattice disorder.

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“…Figure shows the P–E response for all the compositions at room temperature. For pure KBT, some researches obtained a saturated P–E loops at the relatively high electric field over 90 kV/mm . In our work, an inadequate saturated P–E loops could be obtained for the pure KBT until the electric field reaches 120 kV/cm, as seen in Fig.…”

Section: Resultssupporting

confidence: 48%

Origin of Relaxor Behavior in K_1/2Bi_1/2TiO₃–Bi(Mg_1/2Ti_1/2)O₃ Investigated by Electrical Impedance Spectroscopy

Zhu

Guo

et al. 2016

J. Am. Ceram. Soc.

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Lead‐free binary K1/2Bi1/2TiO3‐Bi(Mg1/2Ti1/2)O3 (KBT‐BMT) ferroelectric ceramics with a morphology of dense and evenly sized grains have been prepared by conventional solid oxide reaction route. X‐ray diffraction analysis indicates that all the samples possess pure perovskite structure, and undergo a phase transformation from tetragonal to pseudocubic phase as BMT adds into KBT. Meanwhile, BMT addition brings in the enhancement of the relaxor behavior as revealed by temperature‐dependent dielectric profiles and the P–E loops. The impedance analysis reveals that the relaxation process existing in the ceramics belongs to a localized species. Further, in the frequency‐dependent M″(f) spectra, a shoulder response emerges accompanied by a bulk response as suitable amount of BMT is added, and its frequency dependence obeys Vogel–Fulcher relation f = f0 exp[ ‐ Eb/kB(T ‐ TVF)]. The shoulder response is believed to be the evidence of the existence of the polar nanoregions, which dominate the relaxor behavior of KBT‐BMT ceramics.

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Evolution of the electrical properties of K0.5Bi0.5TiO3 as a result of prolonged sintering

Cited by 35 publications

References 32 publications

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Local Structure of Disordered Bi_0.5K_0.5TiO₃ Investigated by Pair Distribution Function Analysis and First-Principles Calculations

Origin of Relaxor Behavior in K_1/2Bi_1/2TiO₃–Bi(Mg_1/2Ti_1/2)O₃ Investigated by Electrical Impedance Spectroscopy

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Evolution of the electrical properties of K0.5Bi0.5TiO3 as a result of prolonged sintering

Cited by 35 publications

References 32 publications

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Local Structure of Disordered Bi0.5K0.5TiO3 Investigated by Pair Distribution Function Analysis and First-Principles Calculations

Origin of Relaxor Behavior in K1/2Bi1/2TiO3–Bi(Mg1/2Ti1/2)O3 Investigated by Electrical Impedance Spectroscopy

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Local Structure of Disordered Bi_0.5K_0.5TiO₃ Investigated by Pair Distribution Function Analysis and First-Principles Calculations

Origin of Relaxor Behavior in K_1/2Bi_1/2TiO₃–Bi(Mg_1/2Ti_1/2)O₃ Investigated by Electrical Impedance Spectroscopy