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Anisimkin V.I.,Russian Academy of Sciences | Pyataikin I.I.,Russian Academy of Sciences | Voronova N.V.,ELPA Company
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control | Year: 2012

The Anisimkin Jr. (AN) acoustic plate mode having dominant and depth-independent longitudinal displacement (u1 u2, u3; u1 constant) is numerically found in tetragonal 4mm Li2B4O7 crystal with one of the low-symmetry orientations (Euler angles 89, 37, 104), as an example. The quasi-longitudinal (QL) modes with dominant and depth-dependent longitudinal displacement (u1 u2, u3; u1 constant) are experimentally detected along several propagation directions in 128y-LiNbO3 plate, where = 0, 30, 60, and 90 with respect to the x-axis. Compared with more symmetrical plate materials and orientations, the displacement profiles of the AN and QL modes in lower-symmetry counterparts are qualitatively the same, but their phase profiles are more complicated. Moreover, like any acoustic wave, all plate modes in anisotropic crystals suffer from beam steering, in general. The power flow angles of the modes propagating in a fixed direction are different and depend on the mode order n. © 2012 IEEE. Source


Politova E.D.,Karpov Institute of Physical Chemistry | Golubko N.V.,Karpov Institute of Physical Chemistry | Kaleva G.M.,Karpov Institute of Physical Chemistry | Mosunov A.V.,Karpov Institute of Physical Chemistry | And 2 more authors.
Ferroelectrics | Year: 2015

Influence of complex NaCl/KCl and CaCl2/KCl additives (with molar ratios 1:1 and 0.75:0.25, respectively) with low melting temperatures on structure, dielectric and polar properties of ceramic solid solutions on the base of the composition from Morphotropic Phase Boundary in the system (1-x)BiScO3 - xPbTiO3 with x = 0.645 (BSPT) was studied. Using the initial BSPT powders prepared from nitrates solutions dense single phase ceramic samples doped by the additives in amounts 5-15 w.% were obtained at 1050°C (2 h). The shift of initial BSPT composition from mixture of rhombohedral and tetragonal phases to tetragonal in case of the NaCl/KCl additives and to pseudocubic (rhombohedral) in case of the CaCl2/KCl additives was observed. Slight increase in the Curie temperature TC value from 673 to 681-679 K initiated by the addition of K+ ions into A site of perovskite lattice was observed in the samples doped by the NaCl/KCl additives, while monotonous decrease of the TC value was typical of the compositions doped by the CaCl2/KCl additives. © 2015 Taylor & Francis Group, LLC. Source


Fetisov L.Y.,Moscow State University | Chashin D.V.,Moscow State University | Fetisov Y.K.,Moscow State University | Segalla A.G.,ELPA Company | Srinivasan G.,Oakland University
Journal of Applied Physics | Year: 2012

A novel three-layer composite consisting of a lead zirconate titanate (PZT) substrate, a PZT film on one side, and a film of ferromagnetic alloy on the other side is fabricated and used for studies on the nature of magneto-electric (ME) interactions. The strain mediated ME voltage under an ac magnetic excitation is compared with the voltage produced by pure piezoelectric response of the sample to an ac electric field. The ME voltage response measured across PZT substrate or PZT film under an ac magnetic field shows peaks at bending modes and longitudinal acoustic modes, with a higher voltage at bending mode than for the longitudinal acoustic mode. A variation in the bending mode frequency with bias magnetic field or electric field is observed and is attributed to variation in the Young's modulus of the magnetic or piezoelectric layers. Estimates of resonance frequencies and ME coefficients are in agreement with the data. Under an ac electric excitation, piezoelectric effects result in a resonance in the voltage measured across the PZT substrate and film. A quantitative agreement is inferred between the measured ME voltage and the voltage produced under an ac electric field. © 2012 American Institute of Physics. Source


Politova E.D.,Karpov Institute of Physical Chemistry | Kaleva G.M.,Karpov Institute of Physical Chemistry | Mosunov A.V.,Karpov Institute of Physical Chemistry | Sadovskaya N.V.,Karpov Institute of Physical Chemistry | Segalla A.H.,ELPA Company
Ferroelectrics | Year: 2013

Ceramic solid solutions from the region of morphotropic boundary on the base of 0.36BiScO3-0.64PbTiO3, modified by complex additives of Bi2O3 and Ni2O3, Bi2O3 and MnO2, and LiF additives in amounts up to 5 w. % have been prepared by the conventional solid state reaction method. Decreasing of the phase formation temperature accompanies by increasing in density of the doped ceramics have been revealed. Influence of additives on microstructure, dielectric, ferroelectric properties, and effects of dielectric relaxation have been revealed. Copyright © Taylor and Francis Group, LLC. Source


Fetisov Y.K.,RAS Institute of Radio Engineering and Electronics | Chashin D.V.,RAS Institute of Radio Engineering and Electronics | Segalla A.G.,ELPA Company | Srinivasan G.,Oakland University
Journal of Applied Physics | Year: 2011

Studies in recent years have focused mainly on strain mediated magnetoelectric (ME) effects in magnetostrictive-piezoelectric composites. This report is on resonance ME effects in a piezoelectric bimorph. The effect arises due to combination of piezoelectricity and the Ampere force on the sample that carries an ac electric current and placed in a bias magnetic field. The ME coefficient is as high as 16.5 V/(A kOe) at 153 Hz due to bending oscillations. Estimated ME coefficients are in agreement with the data. © 2011 American Institute of Physics. Source

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