Zelenograd, Russia
Zelenograd, Russia

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Segalla A.G.,Elpa Research Institute | Nersesov S.S.,Elpa Research Institute | Miroshnikov P.V.,Elpa Research Institute | Chistyakova N.A.,Elpa Research Institute | And 2 more authors.
Inorganic Materials | Year: 2017

We have studied the effect of preparation conditions on the structural, dielectric, piezoelectric, and other properties of ceramic samples cut from large, bulk hot-pressed bodies based on modified Bi3TiNbO9 and found conditions favorable for obtaining high piezoelectric parameters that ensure long-term functioning of Bi3TiNbO9-based ceramics at a temperature of 750°C. © 2017, Pleiades Publishing, Ltd.


Kaleva G.M.,Karpov Institute of Physical Chemistry | Politova E.D.,Karpov Institute of Physical Chemistry | Mosunov A.V.,Karpov Institute of Physical Chemistry | Sadovskaya N.V.,Karpov Institute of Physical Chemistry | And 2 more authors.
Inorganic Materials | Year: 2012

Ceramic samples of 0.36BiScO 3 • 0.64PbTiO 3 morphotropic phase boundary solid solutions modified with low-melting additives (bismuth, nickel, and manganese oxides and lithium fluoride; < 5 wt %) have been prepared by solid-state reactions, and the phase formation, microstructure, and dielectric properties of the ceramics have been investigated. The additives were shown to lower the formation temperature of the solid solutions and raise the density of the ceramics. Varying the heat treatment conditions, we obtained single-phase samples, both large-grained, ranging in grain size from a few to tens of microns, and fine-grained, with a submicron-scale microstructure. The ceramics were shown to form through liquid-phase sintering. The additives influenced the dielectric properties, electrical conductivity, Curie temperature, and dielectric relaxation of the ceramics. © 2012 Pleiades Publishing, Ltd.


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 | And 2 more authors.
Ferroelectrics | Year: 2012

Ceramic solid solutions on the base of composition from morphotropic phase boundary 0.36BiScO3-0.64PbTiO3 modified by the powdered Bi4Ti3O12 and Bi0.75Sr 0.25O1.36 single crystals additives and by the low-melting LiF additive in amounts 5, 10, and 1 wt.%, respectively, have been prepared by the solid-state reactions method. The structure, microstructure, and dielectric properties of the ceramics have been studied. The influence of the additives on the morphology of ceramics, temperature of phase transitions, and effect of dielectric relaxation has been proved. Copyright © Taylor & Francis Group, LLC.


Anisimkin V.I.,RAS Institute of Radio Engineering and Electronics | Pyataikin I.I.,RAS Institute of Radio Engineering and Electronics | Voronova N.V.,Elpa Research Institute | Puchkov Y.V.,Elpa Research Institute
Journal of Communications Technology and Electronics | Year: 2016

Temperature coefficients of delay of zero- and higher-order acoustic plate modes in the most widespread piezoelectric crystals are calculated and measured. It is shown that, along with the well-known dependence of these coefficients on material constants (typical of surface and bulk acoustic waves), their values for plate modes depend also on the mode number, plate thickness, acoustic wavelength, and thermal expansion coefficient of the crystal across the plate thickness, which allows one to change the temperature sensitivity of plate modes in wide limits without changing the material and orientation of the crystal. For some combinations of the aforementioned parameters, very small temperature changes Δt ~ 10–3°C are detected. © 2016, Pleiades Publishing, Inc.


Dobrynin A.V.,Moscow Power Engineering Institute | Kharitonova T.V.,Moscow Power Engineering Institute | Kazakov V.K.,ELPA Research Institute
Semiconductors | Year: 2010

An analytical expression has been derived to calculate the temperature in the bulk of a piezoelectric cell and on its surface with allowance made for the distributed heat release. It is experimentally shown that the temperature at the center of actuator exceeds the temperature on its surface by 10-40°C and reaches 50-140°C under specific loads of 50-100 W/cm3. The reason for this is that up to 25-45% of the supplied energy is transformed into heat. It is established that the main cause of actuator failure is electric breakdown and exfoliation of passive ceramic layers. © 2010 Pleiades Publishing, Ltd.


Bekhtin M.A.,Moscow State University | Bush A.A.,Moscow State University | Kamentsev K.E.,Moscow State University | Segalla A.G.,Elpa Research Institute
Inorganic Materials | Year: 2016

Ceramic samples of the Aurivillius phases Bi3TiNbO9, Bi2CaNb2O9 and Bi2.5Na0.5Nb2O9 doped with a variety of elements have been prepared by hot pressing. The ceramics have been characterized by X-ray diffraction and their dielectric and piezoelectric properties have been studied. The temperature dependences of their dielectric permittivity, dielectric loss tangent, and piezoelectric response have been investigated at temperatures from 290 to 1250 K and frequencies from 25 Hz to 1 MHz. The samples have been shown to possess ferroelectric properties with a Curie temperature in the range 1060–1210 K. The piezoelectric charge coefficient d33 of poled ceramic samples is 11–18 pC/N at room temperature and remains unchanged up to 800 K. © 2016, Pleiades Publishing, Ltd.


Bekhtin M.A.,Moscow State Institute of Radio-engineering Electronics and Automation | Bush A.A.,Moscow State Institute of Radio-engineering Electronics and Automation | Segalla A.G.,Elpa Research Institute
Inorganic Materials | Year: 2014

We report the preparation of ceramic samples of (1 - x)BiScO 3·xPbTiO3·yMO z (M = Mn, Ni; 0.63 ≤ x ≤ 0.65; 0 ≤ y < 0.02) solid solutions with a tetragonally distorted perovskite structure, X-ray diffraction characterization of the solid solutions, and their dielectric, piezoelectric, and pyroelectric properties. We present data on the symmetry and unit-cell parameters of the solid solutions, characteristics of their dielectric hysteresis loops, and the temperature dependences of their relative dielectric permittivity É, dielectric loss tangent tan δ, piezoelectric charge coefficient d 33, and pyroelectric coefficient p σ in the range 290-800 K. After poling, the ceramics possessed well-defined piezo- and pyroelectric properties, with characteristic 290-K d 33 and p σ values of 300 pC/N and 15 nC/(cm2 K), respectively. © 2014 Pleiades Publishing, Ltd.

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