Effects of coupling ability of dopants on NbO6 vibration and piezoelectric properties of KNN lead-free ceramics

Wang, Xingcheng; Zhang, Guoxiang

doi:10.1016/j.jpcs.2022.110633

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…Additionally, the energy band structure of the oxides is calculated based on the DFT, as presented in Figures 7(B)-(E). Different from O KNN, [34][35][36] worth noting that the bottom of the conduction band and the top of the valence band for CuO, Fe 2 O 3 and ZnO are close to the O KNN. On the contrary, the ones of Al 2 O 3 are far from O KNN.…”

Section: Resultsmentioning

confidence: 87%

“…Thus, easy carrier motion and associated space charge layer is observed at the interface between the KNN and the CuO, Fe 2 O 3 , and ZnO, which is verified by the E a and τ . As discussed above, the electrical field‐activated oxygen‐vacancy migration is of importance for the breakdown 34–36 . Such space charge layer plays the resistance to the breakdown current and therefore improves the E B .…”

Section: Resultsmentioning

confidence: 97%

“…As discussed above, the electrical field-activated oxygen-vacancy migration is of importance for the breakdown. [34][35][36] Such space charge layer plays the resistance to the breakdown current and therefore improves the E B .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the energy band structure of the oxides is calculated based on the DFT, as presented in Figures 7(B)‐(E). Different from O KNN, 34–36 all oxides are indirect band gap semiconductors, since the conduction band bottom and valence band top are located in different positions, and the forbidden band width ( E g ) is 0.694 eV for KNN‐CuO, 0.498 eV for KNN‐Fe 2 O 3 , 3.398 eV for KNN‐ZnO, 5.966 eV for KNN‐Al 2 O 3 . It is worth noting that the bottom of the conduction band and the top of the valence band for CuO, Fe 2 O 3 and ZnO are close to the O KNN.…”

Section: Resultsmentioning

confidence: 99%

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Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Li,

Zhang,

et al. 2023

Int J Applied Ceramic Tech

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In the work, the CuO, Fe2O3, ZnO, and Al2O3 are doped in the potassium‐sodium niobate (KNN) to investigate their effects on the breakdown strength (EB) through in situ decomposition reaction on the KNN particles. The results suggest that the EB increases to some extent, thanks to the addition of oxides. Particularly, the addition of ZnO improves the EB by 34.08% compared with pure KNN ceramics. The X‐ray diffractometry, SEM, temperature‐dependent dielectric constant, complex impedance spectrum, breakdown strength test, and energy band structure are employed for the EB investigation. The addition of Fe2O3 and Al2O3 can reduce the grain size of ceramics while CuO leads to grain growth. The relative density, dielectric constant, activation energy (Ea), and relaxation time (τ) of the ceramics are enhanced by the addition of Fe2O3, ZnO and Al2O3. Among these factors, the relative density is helpful for the improvement of the EB. Additionally, the featured energy band structure contributes to such improvement.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Li,

Zhang,

et al. 2023

Int J Applied Ceramic Tech

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“…Raman spectroscopy is widely used to study the vibrations of NbO 6 octahedra, 14,15 and Fig. 3a shows the Raman spectrum of the ceramics obtained at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Yang,

Li,

Deng

et al. 2024

ECS J. Solid State Sci. Technol.

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In this study, (1-x)K0.5Na0.5NbO3−xBa0.5Sr0.5(Zn1/3Nb2/3)O3, [(1-x)KNN-xBSZN] lead-free relaxor ceramics were fabricated by a conventional solid-state reaction method. X-ray diffraction and Raman spectra confirm the R-C phase transition of the ceramics. The incorporation of BSZN effectively suppressed grain growth, enhanced the electrical resistivity, and improved the relaxation behavior. By analyzing the ferroelectric property of the sample under breakdown field, it is found that when x=0.08, the ceramic demonstrates the smallest variation in polarization (∆P=12.43 μC/cm2), the highest recoverable energy storage density (Wrec=0.8 J/cm3) and energy storage efficiency (η=58.8%). The enhancement of energy storage is attributed to the introduction of BSZN, which effectively suppresses grain growth and improves the relaxation behavior of the ceramics. The results show that the ceramic enables be used in pulsed-power systems at low electrical field.

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Semiconductive Filler‐Based Hybrid Piezoelectric Materials

Banerjee,

Baburaj,

Aliyana

et al. 2024

Hybrid Materials for Piezoelectric Energy Harvesting and Conversion

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Effects of coupling ability of dopants on NbO6 vibration and piezoelectric properties of KNN lead-free ceramics

Cited by 6 publications

References 27 publications

Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Semiconductive Filler‐Based Hybrid Piezoelectric Materials

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