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000851305 1001_ $$0P:(DE-Juel1)171354$$aLiang, Sijia$$b0$$eCorresponding author
000851305 245__ $$aSurface acoustic waves in strain-engineered K0.7Na0.3NbO3 thin films
000851305 260__ $$aMelville, NY$$bAmerican Inst. of Physics$$c2018
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000851305 520__ $$aEpitaxial K0.7Na0.3NbO3 thin films are grown via metal-organic chemical vapor deposition on (110)-oriented TbScO3. The films are strained due to the substrate–film lattice mismatch and therefore exhibit a strong and anisotropic modification of all its ferroelectric properties. The compressive in-plane strain leads to a reduction of the ferroelectric transition temperature from approximately 700 K for unstrained K0.7Na0.3NbO3 to 324 K and 330 K with maximum permittivities of 10 270 and 13 695 for the main crystallographic directions [001]TSO and [110]TSO, respectively. Moreover, the quite thin films (approx. 30 nm thick) exhibit very large piezoelectric properties. For instance, surface acoustic waves with intensities of up to 4.7 dB are recorded for wave propagation along the [110]TSO direction. The signal is smaller (up to 1.3 dB) along [001]TSO, whilst for the intermediate direction [112]TSO, the signal seems to vanish (<0.1 dB). The results indicate that the choice of material, (K,Na)NbO3, in combination with strain-engineering via epitaxial growth onto lattice-mismatched substrates represents a promising way to optimize ferroelectric materials for piezoelectric thin-film applications.
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000851305 7001_ $$0P:(DE-Juel1)161308$$aDai, Yang$$b1
000851305 7001_ $$0P:(DE-HGF)0$$avon Helden, L.$$b2
000851305 7001_ $$00000-0002-8919-3608$$aSchwarzkopf, J.$$b3
000851305 7001_ $$0P:(DE-Juel1)128749$$aWördenweber, R.$$b4
000851305 773__ $$0PERI:(DE-600)1469436-0$$a10.1063/1.5035464$$gVol. 113, no. 5, p. 052901 -$$n5$$p052901 -$$tApplied physics letters$$v113$$x1077-3118$$y2018
000851305 8564_ $$uhttps://juser.fz-juelich.de/record/851305/files/1.5035464-1.pdf$$yPublished on 2018-07-30. Available in OpenAccess from 2019-07-30.
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