Growth of (1 − x)(Na1/2Bi1/2)TiO3–xKNbO3 single crystals by the self-flux method and their characterisation

Abbas, Ali; Jung, Wan-Gil; Moon, Won-Jin; Uwiragiye, Eugenie; Pham, Thuy Linh; Lee, Jong-Sook; Fisher, John G.; Ge, Wenwei; Naqvi, Furqan Ul Hassan; Ko, Jae-Hyeon

doi:10.1007/s43207-023-00357-7

J. Korean Ceram. Soc.

2024

DOI: 10.1007/s43207-023-00357-7

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Growth of (1 − x)(Na1/2Bi1/2)TiO3–xKNbO3 single crystals by the self-flux method and their characterisation

Ali Abbas,

Wan-Gil Jung,

Won-Jin Moon

et al.

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2024

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Cited by 3 publications

References 108 publications

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Top-seeded solid-state single crystal growth of 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals in oxygen and their characterization

Le,

Lee,

Kim

et al. 2024

J. Korean Ceram. Soc.

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Top-seeded solid-state single crystal growth of 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals in oxygen and their characterization

Le,

Lee,

Kim

et al. 2024

J. Korean Ceram. Soc.

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Fabrication of Textured 0.685(Na0.5Bi0.5)TiO3-0.065BaTiO3-0.25SrTiO3 Electrostrictive Ceramics by Templated Grain Growth Using NaNbO3 Templates and Characterization of Their Electrical Properties

Andleeb,

Trung,

Fisher

et al. 2024

Crystals

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Electrostrictive materials based on (Na0.5Bi0.5)TiO3 are promising lead-free candidates for high-precision actuation applications, yet their properties require further improvement. This study aims to enhance the electromechanical properties of a predominantly electrostrictive composition, 0.685(Na0.5Bi0.5)TiO3-0.065BaTiO3-0.25SrTiO3, by using templated grain growth. Textured ceramics were prepared with 1~9 wt% NaNbO3 templates. A high Lotgering factor of 95% was achieved with 3 wt% templates and sintering at 1200 °C for 12 h. Polarization and strain hysteresis loops confirmed the ergodic nature of the system at room temperature, with unipolar strain significantly improving from 0.09% for untextured ceramics to 0.23% post-texturing. A maximum normalized strain, Smax/Emax (d33*), of 581 pm/V was achieved at an electric field of 4 kV/mm for textured ceramics. Textured ceramics also showed enhanced performance over untextured ceramics at lower electric fields. The electrostrictive coefficient Q33 increased from 0.017 m4C−2 for untextured ceramics to 0.043 m4C−2 for textured ceramics, accompanied by reduced strain hysteresis, making the textured 0.685(Na0.5Bi0.5)TiO3-0.065BaTiO3-0.25SrTiO3 composition suitable for high-precision actuation applications. Dielectric properties measured between −193 °C and 550 °C distinguished the depolarization, Curie–Weiss and Burns temperatures, and activation energies for polar nanoregion transitions and dc conduction. Dispersive dielectric constants were found to observe the “two” law exhibiting a temperature dependence double the value of the Curie–Weiss constant, with shifts of about 10 °C per frequency decade where the non-dispersive THz limit was identified.

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Growth of Single Crystals of (K1−xNax)NbO3 by the Self-Flux Method and Characterization of Their Phase Transitions

Trung,

Uwiragiye,

Lan

et al. 2024

Materials

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In this study, single crystals of (K1−xNax)NbO3 are grown by the self-flux crystal growth method and their phase transitions are studied using a combination of Raman scattering and impedance spectroscopy. X-ray diffraction shows that single crystals have a perovskite structure with monoclinic symmetry. Single crystal X-ray diffraction shows that single crystals have monoclinic symmetry at room temperature with space group P1211. Electron probe microanalysis shows that single crystals are Na-rich and A-site deficient. Temperature-controlled Raman scattering shows that low temperature monoclinic-monoclinic, monoclinic-tetragonal and tetragonal-cubic phase transitions take place at −20 °C, 220 °C and 440 °C. Dielectric property measurements show that single crystals behave as a normal ferroelectric material. Relative or inverse relative permittivity peaks at ~−10 °C, ~230 °C and ~450 °C with hysteresis correspond to the low temperature monoclinic-monoclinic, monoclinic-tetragonal and tetragonal-cubic phase transitions, respectively, consistent with the Raman scattering results. A conduction mechanism with activation energies of about 0.5–0.7 eV was found in the paraelectric phase. Single crystals show polarization-electric field hysteresis loops of a lossy normal ferroelectric. The combination of Raman scattering and impedance spectroscopy is effective in determining the phase transition temperatures of (K1−xNax)NbO3.

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Growth of (1 − x)(Na1/2Bi1/2)TiO3–xKNbO3 single crystals by the self-flux method and their characterisation

Cited by 3 publications

References 108 publications

Top-seeded solid-state single crystal growth of 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals in oxygen and their characterization

Top-seeded solid-state single crystal growth of 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals in oxygen and their characterization

Fabrication of Textured 0.685(Na0.5Bi0.5)TiO3-0.065BaTiO3-0.25SrTiO3 Electrostrictive Ceramics by Templated Grain Growth Using NaNbO3 Templates and Characterization of Their Electrical Properties

Growth of Single Crystals of (K1−xNax)NbO3 by the Self-Flux Method and Characterization of Their Phase Transitions

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