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  • 1
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The compound acoustic resonator method is used to study the phenomenon of the ferrobielastic transition in single crystals of quartz subjected to uniaxial pressure. Toward this end, a layered structure consisting of an aluminum film/zinc oxide film/aluminum film sandwich was deposited on one of the surfaces of an X-cut plane-parallel quartz plate. This structure served as an electromechanical transducer in such a way that the entire system acted as a multifrequency acoustic resonator. Uniaxial pressure was applied perpendicular to the direction of propagation of the acoustic waves and caused a growth of the frequencies of the resonance peaks of the structures, indicating a change in the velocity of the acoustic waves. The ferrobielastic phase transition, which arises at some threshold pressure (the ferrobielastic switching effect), is characterized by a discontinuous drop in the frequencies of the resonance peaks. The variation of the resonator frequency both below and above the switching threshold correlates with the variation of the so-called “natural” sound velocity determined by the pressure-dependent elasticity constants of the material. The observed frequency jump of the resonance peaks is due mainly to the relatively abrupt change in the dimensions of the crystal. The results of the acoustic measurements allow reliable recording of the switching effect and a study of its properties.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1090-6487
    Keywords: 62.20.Dc ; 61.66.−f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ferrobielastic switching is observed by measuring the change in the frequency of a compound acoustic cavity made from a langasite (La3Ga5SiO14) single crystal, under uniaxial pressure. The effect is detected from the jump in the cavity frequency at the point of switching. In quartz the measured value of the pressure at the point of switching is found to be much higher, 740 MPa.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis is made of the mode selection for a thin piezoelectric layer in a bulk-acoustic-wave composite layered acoustic resonator by transformation of the impedance using a set of quarter-wave layers. Depending on the number of layers, the impedance of the substrate on which the piezoelectric layer is deposited may be abruptly increased or sharply reduced. This serves to simulate a “fixed” or “free” surface. As a result, a mechanically strong resonator structure is produced, operating at the natural frequencies of a thin piezoelectric layer. A numerical simulation is made of multilayer structures formed by alternating quarter-wave layers of LiNbO3 and LiTaO3. It is shown that if these layers are of micron thickness and there is a sufficiently large number of them, the acoustic properties of the substrate do not influence the frequency characteristics and Q factor of the thin piezoelectric vibrating layer in the microwave range.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the sensitivity of gas-analytical chemical sensors can be drastically enhanced when the thickness of the film deposited on the resonator surface corresponds to a quarter of the acoustic wavelength in the resonator.
    Type of Medium: Electronic Resource
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