Composition dependency of crystal structure, electrical and piezoelectric properties for hydrothermally-synthesized 3 µm-thickness (K&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Na&lt;sub&gt;1−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;)NbO&lt;sub&gt;3&lt;/sub&gt; films

Shiraishi, Takahisa; Einishi, Hiro; Yasui, Shintaro; Ishikawa, Mutsuo; Hasegawa, Tomohito; Kurosawa, Minoru Kuribayashi; Uchida, Hiroshi; Sakashita, Yukio; Funakubo, Hiroshi

doi:10.2109/jcersj2.121.627

Cited by 22 publications

(27 citation statements)

References 24 publications

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reported by Shiraishi et al,13,14 and 4 to 6 mm thick lms have good ferroelectric and piezoelectric properties (d 33 ¼ 68 pm V À1 ). Lusiola et al reported the fabrication of NaNbO 3 -K 0.5 Na 0.5 NbO 3 (NN-KNN) thick lms using a low temperature molten salt powder synthesis combined with a hybrid powder/sol gel ink lm.

15 These lms have a piezoelectric coefficient and relative permittivity around 18 pC N À1 and 250 to 800 (depending on the poling conditions), respectively.

…”

mentioning

confidence: 80%

Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition

et al. 2015

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reported by Shiraishi et al.,13,14 and 4 to 6 mm thick lms have good ferroelectric and piezoelectric properties (d 33 ¼ 68 pm V À1 ). Lusiola et al. reported the fabrication of NaNbO 3 -K 0.5 Na 0.5 NbO 3 (NN-KNN) thick lms using a low temperature molten salt powder synthesis combined with a hybrid powder/sol gel ink lm.15 These lms have a piezoelectric coefficient and relative permittivity around 18 pC N À1 and 250 to 800 (depending on the poling conditions), respectively. However, with chemical solution deposition methods, a repeated number of depositions are required to achieve a thick layer, increasing drastically the amount of defects in the nal lm, besides being a lengthy and costly process. Of all techniques for the fabrication of thick lms, electrophoretic deposition (EPD) stands out due its high exibility, low cost and simplicity of application. 23 Although that paper proves the feasibility of getting KNN thick lms by EPD, processing studies, dielectric characterization and relations between processing conditions and properties have not been reported.Within this context, in the present work K 0.5 Na 0.5 NbO 3 (KNN) thick lms are deposited on Pt foils by EPD and sintered at 1100 C for 2 h. We investigate the key parameters, and establish the relationships between suspension media, EPD process conditions, microstructure of the deposits, and resulting electrical properties of KNN lms. This work is also a part of a wide ranging study on the EPD processing of electroceramics that we have been carrying out. The use of EPD is well documented in the area of solid-state fuel cells and biomaterials. 16However, improved knowledge of EPD for dielectrics, piezoelectrics, ferroelectrics and related materials is still required. In our previous papers we have reported EPD of different electroceramic systems: piezoelectrics such as PZT, incipient ferroelectrics such as SrTiO 3 , low loss dielectrics such as BNT, and more recently low sintering temperature such as Tellurium based compounds. 19 22 Among these results, we demonstrated that the selection of the medium, the stability of the suspensions, and the control of the particle zeta potentials, critical for a good deposition, need to be established for each new electroceramic material being processed by EPD. The current study on KNN thick lms has not been reported before, and it is of interest for the fabrication of KNN thick lms and exploitation of KNN assets for the electroceramics community. ExperimentalK 0.5 Na 0.5 NbO 3 (KNN) powders were synthesised by a solid-state reaction method starting from Na 2 CO 3 (Chempur, purity 99.5%), K 2 CO 3 (Merck, purity 99.0%) and Nb 2 O 5 (BDH Chemicals, purity 99.5%). Due to their hygroscopic nature, the carbonates Na 2 CO 3 and K 2 CO 3 were heated to 150 C immediately prior to weighing. The powders were weighed according to the 1 : 1 : 2 stoichiometry, and ball milled in Teon jars containing absolute ethanol as a media and zirconia balls. The ball milling was performed for 5 h at 200 rpm. Aer drying the stoich...

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“…

15 These lms have a piezoelectric coefficient and relative permittivity around 18 pC N À1 and 250 to 800 (depending on the poling conditions), respectively.

…”

mentioning

confidence: 80%

Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition

et al. 2015

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“…KNN films are the solid solution of KNbO 3 and NaNbO 3 . Interestingly, they can form the solid solution at any ratio in the form of film as in the case of bulk ceramics . However, it is always challenging to fabricate high‐quality and uniform KNN‐based films with stoichiometric compositions due to the complexity of the film composition and the volatilization of K and Na elements at high temperatures.…”

Section: Epitaxial Filmsmentioning

confidence: 99%

“…However, it is always challenging to fabricate high‐quality and uniform KNN‐based films with stoichiometric compositions due to the complexity of the film composition and the volatilization of K and Na elements at high temperatures. Nevertheless, several techniques have been utilized to overcome the initial difficulties to prepare the KNN‐based epitaxial films, for example, PLD, RF magnetron sputtering, sol–gel, HT, and metal organic chemical vapor deposition (MOCVD) …”

Section: Epitaxial Filmsmentioning

confidence: 99%

“…Further investigation of those films has found chemical inhomogeneity cross the film thickness, where K elements were rich at the interface, while Na elements were likely to accumulate at the surface of films . However, with further increase of film thickness, K and Na elements were distributed uniformly at a distance from the interface, thus high longitudinal piezoelectric response was obtained at K/Na ratio close to one . On the other hand, high‐quality films synthesized by PLD has the maximum P r of >40 µC cm −2 at K/Na ratio equal to one …”

Section: Epitaxial Filmsmentioning

confidence: 99%

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Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

et al. 2019

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Extensive research and great progress of (K,Na)NbO 3 (KNN)-based lead-free piezoelectric films have been driven by the current legislation and the requirement for sustainable development of society and environment in the applications of microelectromechanical systems. A comprehensive discussion of the recent achievement in KNN-based films is presented herein. First, the available synthetic techniques, chemical modification, the ferroelectric and piezoelectric properties of KNN-based films are reviewed, followed by an introduction of the crystal structures and electrical properties of KNN-based epitaxial films in comparison with the bulk ceramics. Finally, the applications of KNN-based films for the sensors, the energy harvesters, and energy storage devices are addressed, and current challenges and prospects for future work are discussed.

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“…The hydrothermal method is a simple wet process using alkaline source solutions. 20) One of the important characteristics of this method is the ability of the film thickness to be increased easily by repetition of the process itself. We reported, for example, that 130¯m-thick KNbO 3 film with epitaxial growth was prepared by repeated the hydrothermal deposition.…”

Section: )19)mentioning

confidence: 99%

Preparation of {001}<sub>c</sub>-oriented epitaxial (K, Na)NbO<sub>3</sub> thick films by repeated hydrothermal deposition technique

Shiraishi

Ito

Ishikawa

et al. 2018

J. Ceram. Soc. Japan

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{001} c -oriented (K 0.86 Na 0.14 )NbO 3 thick films were prepared at 240°C on (100) c SrRuO 3 //(100)SrTiO 3 substrates by repeated hydrothermal deposition technique. The film thickness was found to increase linearly with the number of deposition cycles, and 60¯m-thick film was obtained after nine repetitions of the deposition. The K/(K+Na) ratio of the deposited thick films, measured by X-ray fluorescence spectroscopy, showed constant values regardless of the number of deposition cycles. Cross-sectional scanning electron microscopy images revealed uniformity of the obtained dense films with no obvious micro cracks and pores. Structural characterization based on X-ray diffraction, XRD 2ª-½ patterns and X-ray pole figure measurement, showed that the epitaxial relationship between the films and substrates with a {001} c orientation was maintained throughout the deposition cycles. In addition, cross-sectional Raman spectra showed that 60¯m-thick (K 0.86 Na 0.14 )NbO 3 film had an orthorhombic structure. The dielectric constant, ¾ r , and tan ¤ showed frequency dependence. The average remanent polarization measured at 100 Hz was 8¯C/cm 2 .

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Composition dependency of crystal structure, electrical and piezoelectric properties for hydrothermally-synthesized 3 µm-thickness (K<i><sub>x</sub></i>Na<sub>1−</sub><i><sub>x</sub></i>)NbO<sub>3</sub> films

Cited by 22 publications

References 24 publications

Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition

Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Preparation of {001}<sub>c</sub>-oriented epitaxial (K, Na)NbO<sub>3</sub> thick films by repeated hydrothermal deposition technique

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Composition dependency of crystal structure, electrical and piezoelectric properties for hydrothermally-synthesized 3 µm-thickness (K<i><sub>x</sub></i>Na<sub>1−</sub><i><sub>x</sub></i>)NbO<sub>3</sub> films

Cited by 22 publications

References 24 publications

Sodium potassium niobate (K0.5Na0.5NbO3, KNN) thick films by electrophoretic deposition

Sodium potassium niobate (K0.5Na0.5NbO3, KNN) thick films by electrophoretic deposition

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Preparation of {001}<sub>c</sub>-oriented epitaxial (K, Na)NbO<sub>3</sub> thick films by repeated hydrothermal deposition technique

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Product

Resources

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Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition

Sodium potassium niobate (K_0.5Na_0.5NbO₃, KNN) thick films by electrophoretic deposition