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- W2059112921 abstract "The extraordinary case of increase in velocity of surface acoustic waves (SAW) caused by electrical shorting of the surface of the superstrong piezoelectric crystal potassium niobate, KNbO3, is numerically found. The explanation of this effect is based on considering SAWs as coupled Rayleigh and Bleustein-Gulyaev modes. A general procedure of approximate decoupling of the modes is suggested for piezoelectric crystals of arbitrary anisotropy. The effect under study takes place when the phase velocity of uncoupled sagittally polarized Rayleigh waves is intermediate between the phase velocities of uncoupled shear-horizontal Bleustein Gulyaev waves at the free and metallized surfaces. In this case, the metallization of the surface by an infinitely thin layer may cause a crossover of the velocity curves of the uncoupled waves. The presence of the mode coupling results in splitting of the curves with transition from one uncoupled branch to the other. This transition is responsible for the increase in SAW velocity, which appears to be greater than its common decrease produced by electrical shorting of the substrate surface." @default.
- W2059112921 created "2016-06-24" @default.
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- W2059112921 date "2000-07-01" @default.
- W2059112921 modified "2023-09-24" @default.
- W2059112921 title "Incredible negative values of effective electromechanical coupling coefficient for surface acoustic waves in piezoelectrics" @default.
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- W2059112921 doi "https://doi.org/10.1016/s0041-624x(00)00019-6" @default.
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