Stress induced effects on piezoelectric polycrystalline potassium sodium niobate thin films

Pinho, Rui; Vilarinho, R.; Moreira, J. Agostinho; Zorro, Fátima; Ferreira, Paulo J.; Ivanov, Maxim; Tkach, Alexander; Costa, Maria Elisabete V.; Vilarinho, Paula M.

doi:10.1039/d2tc05538d

Cited by 2 publications

(1 citation statement)

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“…Both out-of-plane and in-plane images of amplitude (Figure 5b,d) and phase (Figure 5c,e) show that the film possesses a monograin-like domain structure rather than the strip-like domain typically observed in KNN ceramic bulk. Such a grain domain structure has also been observed in previous reports of KNN films [31,32], likely attributed to the insufficient size of the nanoscale grains, which are unable to accommodate larger strip domains. Furthermore, phase-field simulations indicated that within the nanoscale, smaller domains imply that less energy is needed to achieve ferroelectric inversion [33], and it has also been preliminarily noted in KNN-based materials [34].…”

Section: Resultssupporting

confidence: 78%

Composition Regulation of Potassium Sodium Niobate Thin Films through Post-Annealing under Alkali Element Atmospheres

Chen,

Tao,

Fan

et al. 2024

Nanomaterials

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Amorphous potassium sodium niobate (KNN) films were synthesized at 300 °C through the radio frequency magnetron sputtering method and subsequently crystallized by post-annealing at 700 °C in various alkali element atmospheres (Na and K). The as-deposited film is notably deficient in alkali metal elements, particularly K, whereas the loss of alkali elements in the films can be replenished through annealing in an alkali element atmosphere. By adjusting the molar ratio of Na and K in the annealing atmosphere, the ratio of Na/K in the resultant film varied, consequently suggesting the efficiency of this method on composition regulation of KNN films. Meanwhile, we also found that the physical characteristics of the films also underwent differences with the change of an annealing atmosphere. The films annealed in a high Na atmosphere exhibit large dielectric losses with limited piezoelectric vibration behavior, while annealing in a high K atmosphere reduces the dielectric losses and enhances the piezoelectric behavior. Furthermore, the results of vibration measurement demonstrated that the film annealed in a mixed powder of 25% Na2CO3 and 75% K2CO3 exhibits an optimal vibration displacement of ~400 pm under the sinusoidal excitation voltage of 8 V. This approach of altering the composition of KNN films through post-annealing may introduce the new concept of property design of KNN as well as other similar films.

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Section: Resultssupporting

confidence: 78%

Composition Regulation of Potassium Sodium Niobate Thin Films through Post-Annealing under Alkali Element Atmospheres

Chen,

Tao,

Fan

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

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Exploring Lead-Free Piezoelectric Ceramics for Enhanced Energy Harvesting Applications

Chaliha,

Singh,

Aniz

et al. 2024

Next Generation Materials for Sustainable Engineering

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Piezoceramics, stemming from PZT and BaTiO3 discoveries, revolutionize technology with exceptional piezoelectricity. This exploration traces their evolution, highlighting PZT and BaTiO3's foundational roles. Diverse piezoceramics like BiFeO3, BiNaTiO3, and high-d33 KNN are featured. Enhancing KNN's piezoelectric performance via morphotropic phase boundaries, similar to PZT's MPB, is pivotal. The rhombohedral-tetragonal phase boundary in KNN is crucial for high d33 values, emphasizing phase transitions. Controlled sintering and poling, aligning domains, and reducing defects are vital for optimized piezoelectricity. In summary, this narrative explores historical origins, essential properties, KNN's remarkable d33 and Tc, the quest for MPBs, and the role of phase boundaries and meticulous processing in advancing piezoelectric materials.

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Stress induced effects on piezoelectric polycrystalline potassium sodium niobate thin films

Abstract: This work reports a systematical study highlighting the impact of substrate induced stress as a key parameter for the electrical performance and phase transition temperatures of (K,Na)NbO3 polycrystalline thin films.

Cited by 2 publications

References 51 publications

Composition Regulation of Potassium Sodium Niobate Thin Films through Post-Annealing under Alkali Element Atmospheres

Composition Regulation of Potassium Sodium Niobate Thin Films through Post-Annealing under Alkali Element Atmospheres

Exploring Lead-Free Piezoelectric Ceramics for Enhanced Energy Harvesting Applications

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