Fabrication of (K,Na)NbO3films on SrRuO3/(001)SrTiO3substrates by pulsed laser deposition

Fujii, Ichiro; Tagata, Saori; Nakao, Tomohiro; Koyama, Natsuki; Adachi, Hideaki; Wada, Takahiro

doi:10.7567/jjap.54.10na13

Cited by 20 publications

(22 citation statements)

References 36 publications

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“…The KNN-based thin film exhibits highquality single crystallinity with an atomically sharp and flat interface structure and the same orientation as the substrate. [26] This result confirms the monoclinic M C phase of the KNN-based thin film at room temperature. Supperlattice spots are observed in the SAED images along zone axis 010 in the thin film, which is the characteristic diffraction pattern of monoclinic M C phase.…”

Section: Resultssupporting

confidence: 77%

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Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

Luo

Sun

Zhou

et al. 2017

Adv Elect Materials

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Monoclinic phases, as intermediate phases at the morphotropic phase boundary, have been considered as the origin of high piezoelectricity in various piezoelectric systems. However, those monoclinic phases have seldom been experimentally observed at the phase boundary in lead‐free (K,Na)NbO3 (KNN)‐based materials. This work shows that KNN epitaxial thin films demonstrate a monoclinic MC phase stabilized by elastic strain at room temperature, which is identified by both synchrotron X‐ray reciprocal space mapping and piezoresponse force microscopy. It is revealed that the piezoelectricity is greatly enhanced at 170 °C due to the monoclinic MC–MA phase boundary. The discovery of monoclinic phases in this work may open an avenue for developing a new thermotropic phase boundary in KNN‐based materials. The results also provide a guide for the exploration of high piezoelectricity driven by monoclinic phases in lead‐free piezoelectric materials.

show abstract

Section: Resultssupporting

confidence: 77%

“…PZT exhibits a maximum piezoelectric coefficient at a morphotropic phase boundary (MPB) close to Zr/Ti = 52/48, where rhombohedral and tetragonal phases coexist. [26][27][28][29] In this work, KNN epitaxial thin films were prepared by a sol-gel method on (001)-oriented Nb:SrTiO 3 (STO) substrate. [5] Those boundary in KNN-based ceramics.…”

Section: Introductionmentioning

confidence: 99%

Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

Luo

Sun

Zhou

et al. 2017

Adv Elect Materials

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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%

“…Motivated by excellent properties of KNN‐based ceramics, KNN‐based films have also drawn increasing attention due to the potential applications for miniaturized devices in microelectromechanical systems (MEMS) . However, prior to this, the piezoelectric properties of KNN‐based films were not the primary consideration .…”

Section: Introductionmentioning

confidence: 99%

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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“…Additionally, the research of KNN‐based thin films has also gained increasing attention due to the promising properties of their bulk counterparts as well as their potential applications in miniaturized sensors, actuators, energy harvesting systems, and microelectromechanical systems (MEMS) . However, the thin films suffered from the limited thickness and the substrate clamping effect.…”

Section: Introductionmentioning

confidence: 99%

Phase transition and piezoelectricity of BaZrO₃‐modified (K,Na)NbO₃ lead‐free piezoelectric thin films

et al. 2018

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K,Na)NbO 3 (KNN) is a promising lead-free ferroelectric/piezoelectric system, to which incorporating BaZrO 3 can greatly enhance its piezoelectricity, but the mechanism is not clear. This work was conducted to investigate the phase transition in the BaZrO 3 -modifed KNN system and its contribution to piezoelectricity enhancement, using thin films with a fixed orientation and high compositional homogeneity fabricated by a sol-gel method. Two ferroelectric-to-ferroelectric phase transitions are revealed, which correspond to monoclinic M C -M A phase transition at higher temperature and rhombohedral-monoclinic M C phase transition at lower temperature. It is difficult to distinguish these phases in KNN-based bulk materials, but their differences are clear when conducting high-resolution X-ray reciprocal space mapping (RSM) on the present thin films. Piezoresponse force microscopy experiments also revealed an interesting finding that local piezoelectricity of monoclinic phases was higher than that of rhombohedral ones in KNN-based thin films. This work could shed insights on the fundamental understandings for the effect of the chemical doping, and offer guidance for property optimization in the KNN-based lead-free piezoelectrics.

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Fabrication of (K,Na)NbO₃films on SrRuO₃/(001)SrTiO₃substrates by pulsed laser deposition

Cited by 20 publications

References 36 publications

Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

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

Phase transition and piezoelectricity of BaZrO₃‐modified (K,Na)NbO₃ lead‐free piezoelectric thin films

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Fabrication of (K,Na)NbO3films on SrRuO3/(001)SrTiO3substrates by pulsed laser deposition

Cited by 20 publications

References 36 publications

Monoclinic (K,Na)NbO3 Ferroelectric Phase in Epitaxial Films

Monoclinic (K,Na)NbO3 Ferroelectric Phase in Epitaxial Films

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

Phase transition and piezoelectricity of BaZrO3‐modified (K,Na)NbO3 lead‐free piezoelectric thin films

Contact Info

Product

Resources

About

Fabrication of (K,Na)NbO₃films on SrRuO₃/(001)SrTiO₃substrates by pulsed laser deposition

Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

Monoclinic (K,Na)NbO₃ Ferroelectric Phase in Epitaxial Films

Phase transition and piezoelectricity of BaZrO₃‐modified (K,Na)NbO₃ lead‐free piezoelectric thin films