This paper presents the results of an experimental study of the percolation behavior of the complex dielectric constant of ceramic matrix composites(CMC).Samples of piezoactive CMC were obtained by joint sintering of ...This paper presents the results of an experimental study of the percolation behavior of the complex dielectric constant of ceramic matrix composites(CMC).Samples of piezoactive CMC were obtained by joint sintering of synthesized PZT piezoceramic powder(matrix)and crushed particles of sintered PZT piezoceramics(filler)of different compositions.The experimental dependencies of real and imaginary parts of the complex dielectric constant of CMC on the porosity of piezoceramic matrix and volume content of ceramic filler particles were measured and analyzed.It was shown that the additional porosity of the ceramic matrix resulting from sintering of the CMC masks the dielectric percolation transition,that actually occurs at the volume concentration of ceramic filler close to percolation threshold(V~1/3).展开更多
In this paper,we present the experimental results of the comprehensive study of the microstructural features and complex dielectric,elastic and electromechanical properties of the ferroelectrically“hard”piezoceramic...In this paper,we present the experimental results of the comprehensive study of the microstructural features and complex dielectric,elastic and electromechanical properties of the ferroelectrically“hard”piezoceramics based on the lead zirconate titanate(PZT)composition.For the measurements and analysis of the real and imaginary parts of the complex parameters of the studied piezoceramics as well as their frequency dependences,we used precision impedance analyzer Agilent 4294A and Piezoelectric Resonance Analysis Program(PRAP)software.We have found that the studied piezoceramics demonstrate a unique combination of dielectric,elastic and electromechanical parameters along with very low elastic and electromechanical losses and dispersion over a wide frequency range and can be used in various high-power ultrasonic applications.展开更多
基金supported by the Russian Science Foundation Grant No.24-22-00063。
文摘This paper presents the results of an experimental study of the percolation behavior of the complex dielectric constant of ceramic matrix composites(CMC).Samples of piezoactive CMC were obtained by joint sintering of synthesized PZT piezoceramic powder(matrix)and crushed particles of sintered PZT piezoceramics(filler)of different compositions.The experimental dependencies of real and imaginary parts of the complex dielectric constant of CMC on the porosity of piezoceramic matrix and volume content of ceramic filler particles were measured and analyzed.It was shown that the additional porosity of the ceramic matrix resulting from sintering of the CMC masks the dielectric percolation transition,that actually occurs at the volume concentration of ceramic filler close to percolation threshold(V~1/3).
基金financially supported by the Russian Science Foundation Grant No.24-22-00063,https:/rscf.ru/project/24-22-00063/at the Southern Federal University.
文摘In this paper,we present the experimental results of the comprehensive study of the microstructural features and complex dielectric,elastic and electromechanical properties of the ferroelectrically“hard”piezoceramics based on the lead zirconate titanate(PZT)composition.For the measurements and analysis of the real and imaginary parts of the complex parameters of the studied piezoceramics as well as their frequency dependences,we used precision impedance analyzer Agilent 4294A and Piezoelectric Resonance Analysis Program(PRAP)software.We have found that the studied piezoceramics demonstrate a unique combination of dielectric,elastic and electromechanical parameters along with very low elastic and electromechanical losses and dispersion over a wide frequency range and can be used in various high-power ultrasonic applications.
