Microwave Sintering Effect on the Structural and Electrical Properties of Sodium Potassium Niobate Nanocrystallites

Devi, Huidrom Surjalata; Maisnam, Mamata

doi:10.1080/10584587.2019.1674838

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…It is found that the grain size tends to be smaller with the increase of BF content, that is, it decreases from 56.72 μm to 18.50 μm as a function of BF, suggesting that the excess BF can inhibit the grain growth. Compared with CS samples, the grain size is smaller in MWS ceramics (see Figure 4 i), proving that the MWS method can also hinder the growth of grain in ceramics; such a phenomenon has been obtained elsewhere [ 22 , 23 , 24 ]. Significantly, the grain size of MWS BTS-BCT- x BF ceramics is close to CS with the increase of doping concentration starting from 0.008, while still a little smaller than the grain size of CS.…”

Section: Resultsmentioning

confidence: 57%

Structure and Electrical Properties of Microwave Sintered BTS-BCT-xBF Lead-Free Piezoelectric Ceramics

Wang

et al. 2022

Materials

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Barium titanate (BT)-based ceramics are one of the promising piezoelectric materials for environment-friendly electro-mechanical transformation. However, high performance materials are often sintered at high temperatures, resulting in volatile components and increased energy consumption. Here, 0.82Ba(Ti0.89Sn0.11)O3-(0.18-x)(Ba0.7Ca0.3)TiO3-xBiFeO3 (BTS-BCT-xBF) piezoelectric ceramics were prepared by microwave sintering (MWS) method, and the structure and properties were emphatically studied, aiming to reveal the regulatory mechanism of MWS on the structure and properties. Compared with conventional solid sintering (CS), the phase structure presents a similar evolution in MWS ceramics as a function of BF, while the more refined grain size and the denser structure are observed in MWS ceramics. The electrical properties (e.g., d33, εr, tan δ, etc.) of MWS ceramics are superior to the CS ceramics owing to the refined grain size and denser microstructure. It is worth noting that the energy storage performance (e.g., energy storage density, energy storage efficiency) significantly outperformed expectations due to the slender hysteresis loop resulting from the smaller grain and high cubic phase. Therefore, the MWS sintering mechanism can further drive practical application of BT-based ceramics.

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Section: Resultsmentioning

confidence: 57%

Structure and Electrical Properties of Microwave Sintered BTS-BCT-xBF Lead-Free Piezoelectric Ceramics

Wang

et al. 2022

Materials

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“…On the other hand, piezoelectric properties of pure K x Na 1-x NbO 3 were improved by using two different approaches: (I) synthesis of starting powders by different methods such as sol-gel precipitation [15][16][17], hydrothermal [18][19][20], spray-drying [21] and spray pyrolysis [22], and (II) by exploiting process strategies (i.e., texturing [23][24][25][26]) and more effective sintering methods such as spark plasma sintering [20,[27][28][29][30], hot pressing [31][32][33], microwave sintering [34,35] and liquid-phase sintering [36,37].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemically synthesized powder addition on K0.5Na0.5NbO3 ceramic’s properties

Migliori

Mercadelli

Beltrami

et al. 2022

J Mater Sci: Mater Electron

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A new strategy to produce lead-free K0.5Na0.5NbO3 (KNN) piezoceramics with reliable and improved piezoelectric performance is presented for the first time. KNN powders were synthesized using two distinct synthesis routes: a mechanochemical activation-assisted solid-state route (KNNSSR) and a sol–gel modified Pechini method (KNNchem). KNNchem powders were mixed with KNNSSR at different weight ratios (0, 3, 5, 10 and 20 wt%), and the mixtures were conventionally consolidated and sintered at 1130 °C for 2 h. It was found that KNNchem powders influence crystal phase, microstructure and piezoelectric properties of the sintered pellets. Gradually increasing KNNchem content promotes the conversion of the undesired phase present in KNNSSR into the stoichiometric one. It is also proved that the addition of KNNchem between 5 and 10 wt% improves piezoelectric properties, eventually leading to a d33 piezoelectric charge constant value of 113–115 pC/N. These values are among the highest reported for undoped KNN ceramics obtained by conventional sintering.

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Microwave Sintering Effect on the Structural and Electrical Properties of Sodium Potassium Niobate Nanocrystallites

Cited by 2 publications

References 16 publications

Structure and Electrical Properties of Microwave Sintered BTS-BCT-xBF Lead-Free Piezoelectric Ceramics

Structure and Electrical Properties of Microwave Sintered BTS-BCT-xBF Lead-Free Piezoelectric Ceramics

Influence of chemically synthesized powder addition on K0.5Na0.5NbO3 ceramic’s properties

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