Off-centering of a Bi ion in cubic phase of (Bi1/2Na1/2)TiO3

Moriyoshi, Chikako; Takeda, Shigeki; Kuroiwa, Yoshihiro; Goto, Masato

doi:10.7567/jjap.53.09pd02

Cited by 34 publications

(27 citation statements)

References 37 publications

(48 reference statements)

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“…Unlike in the pure BT and BT-based ferroelectrics, the occupancy in the partial ordering in 0.3BT-0.1BMT-0.6BF can be changed with temperature, in a particular ferroelectric phase. Recently, in solid solutions including Bi ions, such as BF-BT 46,47 and BNT 48 , offcentering of the Bi ions was observed. It was reported that the change in the Bi sites from six to ten split sites involved a phase transition from paraelectric (cubic) to ferroelectric phases (tetragonal) in K 0.5 Bi 0.5 TiO 3 22 .…”

Section: Resultsmentioning

confidence: 99%

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

et al. 2020

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A large piezoelectric response in ferroelectric ceramics is typically associated with extrinsic contributions from ferroelectric domain structures. However, such domain structures cannot be expected in systems with pseudo-cubic symmetry. In this study, we determine the mechanism of significant piezoelectricity and ferroelectricity in 0.3BaTiO3–0.1Bi(Mg1/2Ti1/2)O3–0.6BiFeO3 ceramic with a perovskite-type pseudo-cubic symmetry. Synchrotron radiation X-ray diffraction reveals that the Bi ions in this ceramic essentially prefer to be off-centered at six sites by approximately 0.4 Å, in the cubic <100> directions. A phase transition occurs at TC ~725 K. However, the crystal seems to present a cubic symmetry even at room temperature. The large piezoelectric response is caused by the combinational partial ordering of the off-centered Bi ions, adapted to any direction of the applied electric field to the ceramic grains. The proposed mechanism for the emergence of a high polarization in the above system will enable designing novel Pb-free ceramics by controlling the fluctuated and off-centered ions under an applied electric field.

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Section: Resultsmentioning

confidence: 99%

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

et al. 2020

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“…Note that prior works indicate an increase in the lattice distortion upon quenching [18,23,38] and a counter effect upon annealing at 800 °C [38]. Considering that the Bi 3+ ion at the A-site exhibits off-centered displacements even for the furnace cooled specimen [41,42], it is plausible that the off-centering effects are more pronounced upon quenching. The off-centered displacements enhance further along the polar direction upon quenching [43], thus improving the lattice polarizability.…”

Section: Annealing Effects On the Conductivity Of Quenched Samplesmentioning

confidence: 90%

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Venkataraman

2021

Materials

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Na1/2Bi1/2TiO3-based materials have gained considerable attention for their potential to exhibit giant strain, very-high ionic conductivity comparable to yttria stabilized zirconia or high mechanical quality factor for use in high power ultrasonics. In recent times, quenching Na1/2Bi1/2TiO3-based compositions have been demonstrated to enhance the thermal depolarization temperature, thus increasing the operational temperature limit of these materials in application. This work investigates the role of quenching-induced changes in the defect chemistry on the dielectric, ferroelectric and piezoelectric properties of quenched Na1/2Bi1/2TiO3-BaTiO3. The quenched samples indeed demonstrate an increase in the bulk conductivity. Nevertheless, while subsequent annealing of the quenched samples in air/oxygen atmosphere reverts back the depolarization behaviour to that of a furnace cooled specimen, the bulk conductivity remains majorly unaltered. This implies a weak correlation between the defect chemistry and enhanced thermal stability of the piezoelectric properties and hints towards other mechanisms at play. The minor role of oxygen vacancies is further reinforced by the negligible (10–15%) changes in the mechanical quality factor and hysteresis loss.

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“…The k 33 of the q-BNLT4 ceramic is 0.47 and that of OF-BNLT4 is 0.48. Therefore, the piezoelectric activity of k 33 was not deteriorated by the quenching treatment. On the other hand, the d 33 of the q-BNLT4 ceramic is 68.8 pC=N, which is slightly lower than that of the OF-BNLT4 ceramic (80.2 pC=N).…”

Section: Introductionmentioning

confidence: 95%

“…One of the possible reasons is the "off-centering" of the Bi ion in the cubic phase at high temperature in BNT. 33) However, these are still under investigation. Figure 11 shows the piezoelectric properties (a) k 33 , (b) d 33 , and (c) " T 33 =" 0 of OF-and q-BNLBT4-100y as a function of the BT-substituted amount y.…”

Section: Introductionmentioning

confidence: 99%

Quenching effects on piezoelectric properties and depolarization temperatures of (Bi_0.5Na_0.5)TiO₃-based solid solution systems

Miura

Nagata

Takenaka

2017

Jpn. J. Appl. Phys.

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Lead-free ferroelectric and piezoelectric ceramics, (Bi0.5Na0.5(1−x)Li0.5x)TiO3 and (1 − y)(Bi0.5Na0.48Li0.02)TiO3–yBaTiO3 (abbreviated as BNLT100x and BNLBT4-100y, respectively), were fabricated by a quenching procedure after sintering, and then their electrical properties were investigated with the aim of increasing their depolarization temperature Td. From the measurements by a resonance–antiresonance method, the electromechanical coupling factors k33 of BNLT100x and BNLBT4-100y were exactly the same after the quenching treatment as compared with the nonquenched one. The Td of all BNLT100x quenched from 1100 °C reached around 240 °C, and they are almost 60 °C higher for x = 0, 0.02, 0.04, and almost 80 °C higher for x = 0.08 than those of nonquenched ceramics. We also found, from the measurement on BNLBT4-100y quenched from 1100 °C, that the Td values were enhanced to higher temperature by the quenching treatment, even in the case of rhombohedral side (100y < 6), tetragonal side (100y > 6), and MPB composition (100y = 6). Moreover, we confirmed that the rhombohedrality 90-α and the tetragonality c/a values were enhanced by the quenching treatment. This result revealed that, even in the tetragonal symmetry, the lattice distortion (tetragonality) could also be stabilized by the quenching treatment in BNT-based solid solution ceramics.

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Off-centering of a Bi ion in cubic phase of (Bi_1/2Na_1/2)TiO₃

Cited by 34 publications

References 37 publications

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Quenching effects on piezoelectric properties and depolarization temperatures of (Bi_0.5Na_0.5)TiO₃-based solid solution systems

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Off-centering of a Bi ion in cubic phase of (Bi1/2Na1/2)TiO3

Cited by 34 publications

References 37 publications

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Quenching effects on piezoelectric properties and depolarization temperatures of (Bi0.5Na0.5)TiO3-based solid solution systems

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Product

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Off-centering of a Bi ion in cubic phase of (Bi_1/2Na_1/2)TiO₃

Quenching effects on piezoelectric properties and depolarization temperatures of (Bi_0.5Na_0.5)TiO₃-based solid solution systems