Phase transition and morphology evolution of superfine NaNbO3 particles synthesized by the hydrothermal method with the assistance of K+

Zhang, Guoxiang; Wang, Xingcheng; Sun, Qi; Wang, Yuanyu; Zhang, Qilong

doi:10.1016/j.ceramint.2022.05.279

Cited by 6 publications

(7 citation statements)

References 31 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: 85%

“…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: 85%

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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“…It is observed that the Raman spectra of the samples possess the vibration of NbO 6 octahedron, which is assigned to 1A 1g (ν 1 )+1E g (ν 2 )+2F 1u (ν 3 ,ν 4 )+F 2g (ν 5 )+ F 2u (ν 6 ). 26,27 The Fig. 2b is peak fitting of ν 1 , ν 2 and ν 5 for the sample.…”

Section: Resultsmentioning

confidence: 99%

Weakening Effect of Mn on the Oxygen Vacancies of KNN-BZT-Mn Ceramic with Improved Energy Storage Performance

Wang,

Li,

Yang

et al. 2023

ECS J. Solid State Sci. Technol.

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In this work, the weakened pinning effect of oxygen vacancies due to the introduction of Mn on the transfer from polarization nanoregions to normal ferroelectric domains is investigated through the component design. Therefore, the 0.85K0.5Na0.5NbO3−0.15Bi0.5Zn0.5Ti0.5O3-x mol% MnO2 (abbreviated with KNN- BZT-xMn, x = 0 and 0.1, i.e. KNN-BZT and KNN-BZT-Mn) ceramics were synthesized by the conventional solid-reaction method. The relaxor transition from ferroelectric R to paraelectric C phase of the ceramics is demonstrated by the temperature-dependent dielectric constants. The oxygen vacancies account for grain polarization and grain boundary polarization is derived from the migration of oxygen vacancies to the grain boundary, which is indicated by the complex impedance spectra and slimmer ferroelectric hysteresis loop for KNN-BZT-Mn. The mechanism for enhanced energy storage performance is ascribed to the NbMn-Vo decreases the pinning effect of the oxygen vacancies.

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Exploring the possibilities of lead-free 0.98NaNbO3-0.02BiSmKZrO3 for electrical and optical applications using solid-state method

Elaiyaraja,

Karunagaran

2024

Materials Science in Semiconductor Processing

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Phase transition and morphology evolution of superfine NaNbO3 particles synthesized by the hydrothermal method with the assistance of K+

Cited by 6 publications

References 31 publications

Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Breakdown performance of potassium‐sodium niobate piezoceramics copped with oxides

Weakening Effect of Mn on the Oxygen Vacancies of KNN-BZT-Mn Ceramic with Improved Energy Storage Performance

Exploring the possibilities of lead-free 0.98NaNbO3-0.02BiSmKZrO3 for electrical and optical applications using solid-state method

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