Article

Article title TECHNIQUES FOR CREATING CERAMIC PIEZOMATERIALS WITH AN OPTIMAL SET OF PARAMETERS FOR ULTRASONIC TRANSDUCERS
Authors A. A. Nesterov, A. A. Panich, M. I. Tolstunov
Section SECTION I. ELECTRONICS AND NANOTECHNOLOGY
Month, Year 07, 2018 @en
Index UDC 546.05
DOI 10.23683/2311-3103-2018-7-74-85
Abstract The development of modern ultrasound industry impossible without the creation of new technologies piezomaterials of various types. This is due to the fact, that the number of areas of science and technology in which piezo transducers are used increases every year. One of the ways to optimize the functional characteristics of each specific type of transducer is to use, in its manufacture, a piezomaterial with an individual optimal set of electrophysical and mechanical parameters. Traditional methods for varying these parameters consist in changing the composition of the basic ferroelectric phases, but their capabilities are close to saturation. Analysis of the problems arising in the design of ultrasonic devices are shows that some of them can be solved at the construction level. In most cases, it is more convenient and sometimes only possible, to solve them at the piezo material level: the values of the EFP and mechanical parameters (MP) of the piezoelectric transducer. Their ratio, as well as the stability of the EFP of the ultrasonic devices in relation to the operating parameters (controlling electric fields and external mechanical stresses) and the parameters of the state of the systems (temperature, pressure). The second problem of modern ultrasonic devices construction is a limited number of ferroelectric phases, on the basis of which truly effective piezomaterials can be created. This is explained by the fact that the basis of such piezomaterials are lead-containing ferroelectric phases, the traditional technologies of which are characterized by unacceptable (from the point of view of many states) environmental friendliness. This problem is associated with both the high toxicity of lead compounds and the high pressure of their vapors above the condensed phase, which grows exponentially as the temperature of the processes of synthesis of ferroelectrics phase and sintering of press preforms formed on their basis increases. In the proposed work, both new ways of solving the problems of creating ceramic piezomaterials with an optimal (for a specific type of converter) set of dielectric and piezoelectric parameters are proposed, and low-temperature technologies are considered, such as the synthesis of basic ferroelectric phases and sintering of piezoceramics. In addition to solving the environmental problems of materials of this type, the transition from traditional high-temperature technologies to technologies implemented at lower temperatures also has a significant economic effect, since it reduces energy consumption per unit of final product.

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Keywords Ferroelectrics phase; ultrafine powders; low-temperature synthesis and sintering technologies; piezoelectric ceramics; microstructure; electrophysical properties.
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