Deciphering the role of A-site ions of AZrO3-type dopants in (K, Na)NbO3 ceramics

Wang, Xinlong; Lv, Xiang; Ma, Yinchang; Zhang, Xixiang; Lyu, Jing; Wu, Jiagang

doi:10.1016/j.actamat.2023.118997

Cited by 10 publications

(2 citation statements)

References 71 publications

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“…The nanodomain formation in the BF−BT system is associated with Bi 3+ ions off-centering [61], because bismuth has single-pair electrons that can lead to asymmetric distortions and off-center shifts. Therefore, ferroelectric behavior in lead-free materials is associated with realizing structure nanodomains by the off-center Bi ions [62]. plotted between ln(1/ε − 1/εmax) and ln (T − Tm) [37,59] (Figure 17), and all γ values less than 1 kHz are given in Table 3.…”

Section: Dielectric and Ferroelectric Propertiesmentioning

confidence: 99%

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Płońska,

Plewa

2023

Materials

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In this work, were synthesized (Pb0.91La0.09)(Zr0.65Ti0.35)0.9775O3 ceramic materials with different concentrations of praseodymium (0, 0.1, 0.3, 0.5, 1 wt.%) via gel-combustion route and sintered by the hot uniaxial pressing method. Measurements were conducted on the obtained ceramics using X-ray powder diffraction (XRD), scanning electron microscope (SEM), EDS analysis, and examination of dielectric and ferroelectric optical properties. Results give us a detailed account of the influences of the praseodymium ions on the structural, microstructural, and dielectric properties. 3D fluorescence maps and excitation and emission spectra measurements show how a small admixture changes the ferroelectric relaxor behavior to an optically active ferroelectric luminophore.

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Section: Dielectric and Ferroelectric Propertiesmentioning

confidence: 99%

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Płońska,

Plewa

2023

Materials

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“…Lead-free piezoelectric ceramics, such as potassium sodium niobate K x Na 1– x NbO 3 (KNN), have drawn considerable attention in current research due to their high Curie temperature, excellent piezoelectric properties, and environmentally friendly characteristics, making them one of the most promising candidates to replace lead-based piezoelectric ceramics in device applications. − The pure KNN ceramic prepared by a solid-state sintering method has a piezoelectric constant d 33 value of approximately 80 pC/N, showing a significant difference in performance compared to lead-based piezoelectric ceramics. To further improve the piezoelectric performance of lead-free KNN ceramics, researchers have conducted a more detailed investigation into KNN-based lead-free piezoelectric ceramics. − …”

Section: Introductionmentioning

confidence: 99%

Decoding the Piezo-Contributions of Potassium Sodium Niobate Ceramics

Xing,

Mo,

Cheng

et al. 2024

J. Phys. Chem. C

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The contributions to the piezoelectric coefficient d 33 from the intrinsic contribution, reversible low-field domain wall vibration, and irreversible domain switching and displacement of domain walls have been quantitatively investigated in potassium sodium niobate (KNN) ceramics with different phase structures. By measuring the piezoelectric coefficient at a large field and the piezoelectric hysteresis under subswitching conditions following Rayleigh relations, the intrinsic/extrinsic and reversible/irreversible piezoelectric responses are studied to understand the role of different phase boundaries in enhancing the piezoelectricity. This lattice contribution, reversible domain wall vibration, and irreversible contributions are strongly dependent on the crystal and domain structures of the examined ceramics. The intrinsic, reversible extrinsic, and irreversible extrinsic piezoelectric coefficients can both be enhanced in the phase instability regime for KNN-based ceramics. With respect to the intrinsic piezoelectric contribution ratio, ceramics with an orthorhombic-tetragonal (O-T) region have larger values as compared with those having orthorhombic (O)/ rhombohedral-orthorhombic-tetragonal (R-O-T)/rhombohedral-tetragonal (R-T) regions. For KNN ceramics, the extrinsic piezoelectric response is the major contributor to the high piezoelectricity. Strongly linked to temperature, the intrinsic contributions of O/O-T/R-O-T phases decrease first and then increase near the phase transition temperature of the O phase to the T phase in the temperature range, with an opposite tendency in R-T phases.

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Lead‐Free (K, Na)NbO₃ Piezocatalyst with Superior Piezocatalysis and Large‐Scale Production

Wang,

Liao

et al. 2023

Adv Funct Materials

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Although piezocatalysis has achieved preliminary achievements in environmental remediation and biomedical applications, large‐scale fabrication of piezocatalysts with high degradation efficiency and low cost remains challenging. In this work, a new and easy strategy to solve this challenge is innovatively proposed, that is, ceramic‐powder‐driven boosted polarization intensity, and validated the strategy is by examining potassium sodium niobate ((K, Na)NbO3, KNN) ferroelectric. KNN‐3 piezocatalyst, obtained by grinding as‐sintered ceramics into powder, shows a degradation rate (k) as high as 148 × 10−3 min−1 for rhodamine B (RhB) dye and for 31 × 10−3 min−1 for methyl orange (MO) dye, ≈18 times and 66 times than those of previously reported KNN piezocatalysts. The superior piezocatalytic activity is attributed to enhanced polarization intensity, increased oxygen vacancies, and higher charge carrier concentrations. Besides, the KNN‐3 piezocatalyst shows excellent inhibitory effects on Staphylococcus aureus and Escherichia coli strains. Therefore, the proven ceramic preparation technology enables the new strategy to mass produce high‐performance KNN piezocatalysts that hold promise for applications in dye degradation and biomedicine.

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Deciphering the role of A-site ions of AZrO3-type dopants in (K, Na)NbO3 ceramics

Cited by 10 publications

References 71 publications

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Decoding the Piezo-Contributions of Potassium Sodium Niobate Ceramics

Lead‐Free (K, Na)NbO₃ Piezocatalyst with Superior Piezocatalysis and Large‐Scale Production

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Deciphering the role of A-site ions of AZrO3-type dopants in (K, Na)NbO3 ceramics

Cited by 10 publications

References 71 publications

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Investigation of Praseodymium Ions Dopant on 9/65/35 PLZT Ceramics’ Behaviors, Prepared by the Gel-Combustion Route

Decoding the Piezo-Contributions of Potassium Sodium Niobate Ceramics

Lead‐Free (K, Na)NbO3 Piezocatalyst with Superior Piezocatalysis and Large‐Scale Production

Contact Info

Product

Resources

About

Lead‐Free (K, Na)NbO₃ Piezocatalyst with Superior Piezocatalysis and Large‐Scale Production