Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics

Fetzer, Ann‐Katrin; Wohninsland, Andreas; Hofmann, Kathrin; Clemens, Oliver; Venkataraman, Lalitha Kodumudi; Kleebe, Hans‐Joachim

doi:10.1016/j.oceram.2021.100077

Cited by 19 publications

(17 citation statements)

References 45 publications

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“…This is in accordance with recent reports that establish in- The polarization and strain hysteresis in the poled state exhibits a marked departure from the expected influence of oxygen vacancies constraining the domain wall mobility; instead, the increase in total strain and remanent polarization is plausibly a signature of enhanced ferroelectric order. This is in accordance with recent reports that establish increase in volume fraction of polarized regions [44] and enhanced lamellar domain contrast [37]. The hysteresis response of Q-Air800 samples are in contrast to the depolarization behaviour, wherein the T F-R of Q-Air800 samples are similar to FC (Table 1).…”

Section: Electromechanical Hardeningsupporting

confidence: 92%

“…The off-centered displacements enhance further along the polar direction upon quenching [43], thus improving the lattice polarizability. This then reflects as the observed increase in average lattice distortion, corroborated by the recent structural and microstructural investigations on the quenched samples [37,43].…”

Section: Annealing Effects On the Conductivity Of Quenched Samplessupporting

confidence: 74%

“…While NBT6BT FC is characterized by weak lamellar domain contrast coexisting with polar nanoregions, NBT9BT FC exhibits a strong lamellar domain contrast at room temperature [37]. Further, quenching alters the phase assemblage and lamellar/PNR domain contrast in NBT100xBT, especially for the MPB compositions [37]. The difference in T RE for the quenched and subsequently annealed samples of NBT6BT and NBT9BT can be rationalized by correlating to temperature-dependent changes of the domain morphology.…”

Section: Resultsmentioning

confidence: 95%

“…The permittivity is influenced by the changes in domain population and the number density of interfaces, for example domain or grain boundaries. While NBT6BT FC is characterized by weak lamellar domain contrast coexisting with polar nanoregions, NBT9BT FC exhibits a strong lamellar domain contrast at room temperature [37]. Further, quenching alters the phase assemblage and lamellar/PNR domain contrast in NBT100xBT, especially for the MPB compositions [37].…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Electromechanical Hardeningsupporting

confidence: 92%

Section: Annealing Effects On the Conductivity Of Quenched Samplessupporting

confidence: 74%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

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

Venkataraman

2021

Materials

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“…23,24,33 An increased PNR volume fraction above 250 • C and a higher fraction of lamellar domains upon quenching is correlated to the enhanced lattice distortion and stabilized ferroelectric state. 28,34 Piezoresponse force microscopy (PFM) shows a morphology change from labyrinth-like structures towards an increased area and width of the domains in quenched NBT-based ceramics. 35 The NBT-BT solid solution undergoes several temperature-induced phase transitions depending on the composition.…”

Section: Introductionmentioning

confidence: 99%

In situ hot‐stage TEM of the phase and domain evolution in quenched Na_1/2Bi_1/2TiO₃–BaTiO₃

et al. 2021

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Quenching relaxor ferroelectric 0.94(Na 1/2 Bi 1/2 )TiO 3 -0.06BaTiO 3 (NBT-6BT) enhances the depolarization temperature (T d ), linked to the stabilization of ferroelectric order. The thermal evolution of the domain structure and phase assemblage provides insights about the onset of ferroelectric order in quenched materials. Unpoled furnace cooled and quenched NBT-6BT ceramics were studied using in situ temperature-dependent transmission electron microscopy. The rhombohedral to tetragonal structural transition in furnace cooled and quenched samples occurs in a comparable temperature range of 120 • C-220 • C. While the tetragonal phase is characterized by polar nanoregions (PNRs) and no domain contrast in the furnace cooled state, the quenched composition exhibits an increased fraction of lamellar domains, which are partially stable up to 300 • C, thus benefiting the delayed depolarization. This is further corroborated by the dielectric data indicating earlier freezing of PNR dynamics in the quenched state. The reversibility of the phase transition is demonstrated by successive cooling, where quenched NBT-6BT features an increased grainy PNR contrast after the experiment, followed by a kinetically delayed coalescence of PNRs back into lamellar domains. This demonstrates that the stabilized ferroelectric state upon quenching is associated with the conversion of polar units on the nanometer scale into long-range domain structures.

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Quenching-induced nonergodicity in ergodic Na1/2Bi1/2TiO3–BaTiO3–AgNbO3 ceramics

et al. 2021

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Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics

Cited by 19 publications

References 45 publications

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

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

In situ hot‐stage TEM of the phase and domain evolution in quenched Na_1/2Bi_1/2TiO₃–BaTiO₃

Quenching-induced nonergodicity in ergodic Na1/2Bi1/2TiO3–BaTiO3–AgNbO3 ceramics

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Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics

Cited by 19 publications

References 45 publications

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

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

In situ hot‐stage TEM of the phase and domain evolution in quenched Na1/2Bi1/2TiO3–BaTiO3

Quenching-induced nonergodicity in ergodic Na1/2Bi1/2TiO3–BaTiO3–AgNbO3 ceramics

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In situ hot‐stage TEM of the phase and domain evolution in quenched Na_1/2Bi_1/2TiO₃–BaTiO₃