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Quasi-longitudinal (QL) Anisimkin Jr.' modes discovered recently in quartz plates are found now in 2 other piezoelectric crystals, belonging to trigonal symmetry. In 128degY,X+90deg-LiNbO3, 2 different QL modes may propagate simultaneously for small plate thickness h/lambda = 0 to 0.06 (h is thickness, lambda is wavelength). The velocity of the 1st mode, v1, is close to the longitudinal bulk wave...
Anisimkin Jr.' modes discovered recently in quartz plates are found now in two other piezoelectric crystals, belonging to trigonal symmetry. In 128degY,X+90deg-LiNbO3 two different QL modes may propagate simultaneously for small plate thickness h/lambda = 0 - 0.06 (h - thickness, lambda - wavelength). Velocity of the 1st mode v1 is close to the longitudinal bulk wave velocity vL. It is varied with...
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