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Anisimkin V.I.,RAS Institute of Radio Engineering and Electronics | Voronova N.V.,OAO NII Elpa | Zemlyanitsyn M.A.,RAS Institute of Radio Engineering and Electronics | Pyataikin I.I.,RAS Institute of Radio Engineering and Electronics | Shikhabudinov A.M.,RAS Institute of Radio Engineering and Electronics
Journal of Communications Technology and Electronics | Year: 2012

By the example of 128°Y, X + 9 0 °-LiNbO 3 plates and quasi-longitudinal acoustic modes, the effect of one- and two-sided metallization of plates on the depth profiles of elastic displacements of modes is studied theoretically and experimentally. It is shown that, in the modes with the zero electromechanical coupling coefficient K 2 = 0, the elastic displacement profiles for free and metallized plates are the same; while, in the modes with the nonzero coupling K 2 ≠ 0, they are noticeably different and correspond to either attraction or repulsion of modes from the metallized surface. Correspondingly, the modes become more or less sensitive to surface loading. © 2012 Pleiades Publishing, Inc. Source


Anisimkin V.I.,RAS Institute of Radio Engineering and Electronics | Voronova N.V.,OAO NII Elpa | Zemlyanitsyn M.A.,RAS Institute of Radio Engineering and Electronics | Kuznetsova I.E.,RAS Institute of Radio Engineering and Electronics | Pyataikin I.I.,RAS Institute of Radio Engineering and Electronics
Journal of Communications Technology and Electronics | Year: 2013

Excitation and propagation of the I.V. Anisimkin and Lamb acoustic plate modes of various orders n has been experimentally investigated using, as an example, rotated 128 YX LiNbO3 piezoelectric plates. It is shown that (1) an increase in the number of fingers of the interdigital transducers improves the frequency resolution of the neighboring modes with close velocities, (2) the use of aluminum as a finger material reduces the ripple of the mode amplitude-frequency characteristics (AFC) n as compared to that in the case of gold fingers, and (3) the propagation loss increases with the distance and mode number n. It has been found that group velocities (v g) n and phase velocities (v p) n of the modes excited and received on the same surface of the plate do not change with distance starting, at least, from a 25-wavelength distance from the radiator. It has been established that, if the electrically conducting fluid is deposited on the opposite side of the plate, the shape of the (AFC) n, central frequency f n, and the phase characteristics of certain modes undergo changes that depend on whether the areas under the transducers are also covered with the fluid and on the distance between the transducers. No noticeable reflection of the modes from the plate edges has been recorded. © 2013 Pleiades Publishing, Inc. Source


Anisimkin V.I.,RAS Institute of Radio Engineering and Electronics | Voronova N.V.,OAO NII Elpa | Kuznetsova I.E.,RAS Institute of Radio Engineering and Electronics | Pyataikin I.I.,RAS Institute of Radio Engineering and Electronics
Bulletin of the Russian Academy of Sciences: Physics | Year: 2015

The results from experimental studies of the sensor properties of acoustic modes in LiNbO3 plates with thicknesses h/λ from 0.7 to 5 (where h is thickness and λ is wavelength) are discussed. It is shown that the mode responses are not always equal when liquid is applied to the upper and lower surfaces of a plate. When h/λ ≤ 1, the higher harmonics of lower order modes n are localized near the surface by transducers and interfere with the fundamental harmonics of higher order modes, violating the response symmetry. When h/λ ≥ 1, no such interference is observed, since the higher order modes are localized in the central part of the plate while the lower order modes are localized near the surface with transducer, again violating the response symmetry. The development of sensors for gases and liquids based on higher order modes thus becomes possible only with thin plates at frequencies that exclude interference. © 2015, Allerton Press, Inc. Source


Karpenkov D.Yu.,Tver State University | Bogomolov A.A.,Tver State University | Solnyshkin A.V.,Tver State University | Golovnin V.A.,OAO NII Elpa | And 2 more authors.
Inorganic Materials | Year: 2011

This paper presents an experimental study of the magnetoelectric (ME) properties of layered heterostructures consisting of PZT-46, PZT-19, and Ni-Zn ferrites (1000NN and 2000NN). Their magnetoelectric response is examined as a function of the configuration, shape, and thickness of the layers in the composites. The results demonstrate that increasing the thickness of the magnetostrictive layer from 0.35 to 3.5 mm has an adverse effect on the magnitude of the ME effect. A comparative analysis of the data for rectangular and disk-shaped samples shows that the ME response of the disks is a factor of 2.5 stronger. © 2011 Pleiades Publishing, Ltd. Source


Bush A.A.,Moscow State Institute of Radio-engineering Electronics and Automation | Kamentsev K.E.,Moscow State Institute of Radio-engineering Electronics and Automation | Lavrent'ev A.M.,Moscow State Institute of Radio-engineering Electronics and Automation | Segalla A.G.,OAO NII Elpa | Fetisov Yu.K.,Moscow State Institute of Radio-engineering Electronics and Automation
Inorganic Materials | Year: 2011

We have synthesized ceramic samples of (1 - 2x)BiScO 3· xPbTiO 3· xPbMg 1/3Nb 2/3O 3 perovskite solid solutions with 0.30 ≤ x ≤ 0.46 and studied their structural, dielectric, and piezoelectric properties. At x = 0.40, the system has a morphotropic phase boundary between tetragonal (x > 0.40) and rhombohedral (x < 0.40) solid solutions. The dielectric permittivity and loss tangent of the solid solutions have been measured at temperatures from 100 to 800 K and frequencies from 0.1 to 200 kHz. The maximum in the permittivity of the solid solutions lies in the range 390-440 K. With increasing BiScO 3 content, features characteristic of ferroelectric relaxors emerge and become more pronounced. Near the morphotropic phase boundary, the piezoelectric charge coefficients d 33 and d 31 of the solid solutions reach 410 and 150 pC/N, respectively, and their radial-mode mechanical Q drops to 22, which makes these materials potential candidates for a number of applications. © Pleiades Publishing, Ltd., 2011. Source

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