Theoretical and experimental study of super-high electromechanical coupling surface acoustic wave propagation in KNbO3 single crystal

Yamanouchi, Kaoru; Okada, Hiroyuki; Kojima, Toshiyuki; Matsumura, T.

doi:10.1049/el:19970145

Cited by 124 publications

(47 citation statements)

References 3 publications

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“…Since it was identified as a ferroelectric material in 1949 [1,2], potassium niobate (KNbO 3 ) has been intensively investigated due to its large electro-optical coefficients, nonlinear optical coefficients, and electromechanical coupling factors for various electronic device applications [3][4][5][6]. KNbO 3 attracted intensive attention again when Yasuyoshi Saito, et al [7] reported a lead-free piezoelectric ceramic material based on KNbO 3 -NaNbO 3 solid solution, whose piezoelectricity is comparable with Pb(Zr, Ti)O 3 (PZT) materials.…”

Section: Introductionmentioning

confidence: 99%

Research on the phase transition of (Ba0.07K0.93)NbO3-based PTCR ceramic material

Zhu

Zhong

Ren

et al. 2016

J Mater Sci: Mater Electron

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The phase transition performance and positive temperature coefficient of resistivity (PTCR) effect in Mndoped (Ba 0.07 K 0.93 )NbO 3 -based ceramic material were investigated. The results showed that an excellent PTCR effect with a resistance anomaly (Rmax/Rmin) up to 5 9 10 3 and a switch temperature (Ts) of approximately 60°C was obtained in the ceramic sample. In contrast to the phase transition of orthorhombic-to-tetrahedral and tetrahedral-to-cubic with an exothermic effect, endothermic effects were observed near the temperature of the rhombohedral-to-orthorhombic (R-O) phase transition. The XRD results at elevated temperature showed significant cell shrinkage when the lattice structure transferred from the rhombohedral state to an orthorhombic state, accompanied by remarkable internal stress inside the ceramic sample. The XRD results also showed that both the rhombohedral and orthorhombic phase co-existed near the temperature of the R-O phase transition. At this temperature, we observed a considerable dielectric anomaly from the measurement of the temperature dependency of the dielectric constant, which was believed to be from the unique R-O phase transition. The PTCR effect observed in this material was mainly contributed by the anomalous dielectric constant.

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Section: Introductionmentioning

confidence: 99%

Research on the phase transition of (Ba0.07K0.93)NbO3-based PTCR ceramic material

Zhu

Zhong

Ren

et al. 2016

J Mater Sci: Mater Electron

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“…It is only quite recently that the volume effect based on the symmetry-conforming principle of point defects was proposed and recognized as the intrinsic governing mechanism of ferroelectric aging (Lambeek & Jonker, 1986;Zhang & Ren, 2006;Yuen et al 2007). Compared to tetragonal ferroelectrics, orthorhombic ferroelectrics are as interesting and as important, since orthorhombic ferroelectric phase lies widely in ferroelectrics similar to tetragonal ferroelectric phase (Yamanouchi et al, 1997;Saito et al, 2004;Wang et al, 2006 lead-free piezoelectric applications due to their good piezoelectric properties and high Curie temperatures (Yamanouchi et al, 1997;Saito et al, 2004). However, literature report on the aging effects in this class of (lead-free) ferroelectrics remains essentially insufficient till today (Feng & Or, 2009 so as to provide a relatively complete picture about the aging on both orthorhombic and tetragonal ferroelectrics for the related communities (Feng & Or, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Large nonlinear electrostrains in excess of 0.13% over a broad temerpature range of 25-140 °C are also demonstrated, suggesting potential application of the aging effects to modify or enhance the electromechanical properties of environmentally-friendly (lead-free) ceramics. (Yamanouchi et al, 1997;Saito et al, 2004). The parental compound K(Nb 0.90 Ta 0.10 )O 3 was essentially based on KNbO 3 but was modified by adding 10% Ta to the Nb site.…”

Section: Introductionmentioning

confidence: 99%

Aging-Induced, Defect-Mediated Double Ferroelectric Hysteresis Loops and Large Recoverable Electrostrains in Mn-Doped Orthorhombic KNbO3-Based Lead-Free Ceramics

Wing¹

2010

Ferroelectrics

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“…But such information is extremely interesting with the advent of crystals that possess a strong piezoeffect. 12,13 NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page.…”

Section: Introductionmentioning

confidence: 99%

The power flow angle of acoustic waves in thin piezoelectric plates

Kuznetsova

Зайцев

Teplykh

et al. 2007

Proceedings of the Interntional Congress on Ultrasonics

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Abstract:The curves of slowness and power flow angle (PFA) of quasi-antisymmetric (A0) and quasi-symmetric (S0) Lamb waves as well as quasi-shear-horizontal (SH0) acoustic waves in thin plates of lithium niobate and potassium niobate of X-,Y-, and Z-cuts for various propagation directions and the influence of electrical shorting of one plate surface on these curves and PFA have been theoretically investigated. It has been found that the group velocity of such waves does not coincide with the phase velocity for the most directions of propagation. It has been also shown that S0 and SH0 wave are characterized by record high values of PFA and its change due to electrical shorting of the plate surface in comparison with surface and bulk acoustic waves in the same material. The most interesting results have been verified by experiment. As a whole, the results obtained may be useful for development of various devices for signal processing, for example, electrically controlled acoustic switchers.

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Theoretical and experimental study of super-high electromechanical coupling surface acoustic wave propagation in KNbO3 single crystal

Cited by 124 publications

References 3 publications

Research on the phase transition of (Ba0.07K0.93)NbO3-based PTCR ceramic material

Research on the phase transition of (Ba0.07K0.93)NbO3-based PTCR ceramic material

Aging-Induced, Defect-Mediated Double Ferroelectric Hysteresis Loops and Large Recoverable Electrostrains in Mn-Doped Orthorhombic KNbO3-Based Lead-Free Ceramics

The power flow angle of acoustic waves in thin piezoelectric plates

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