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BNT-based lead-free piezoelectric ceramics have been attracting great attention worldwide as new piezoelectric ceramics which will be most possibly in place of lead-containing piezoelectric ceramics. However, they are not as good as those lead-based piezoelectric ceramics and need to be further improved. In this paper, the recent development of researches on BNT-based lead-free piezoelectric ceramics...
Piezoelectric ultrasonic transducer is the transducer which is technically designed for electrical measurement of non-medical electrical capacity, some physiology parameters of human body like blood pressure, pulse, breathe, body temperature, and etc. are non-electrical capacity. In order to measure these physiological parameters, the simplest way is to change them for the project is technically easier...
Ferromagnetic Co0.5Cu0.5Fe2O4 and ferroelectric Ba0.8Sr0.2TiO3 composite ceramics, xCo0.5Cu0.5Fe2O4 + (1-x)Ba0.8Sr0.2TiO3 for x = 0.15, 0.3 and 0.45, were prepared by a conventional solid-state reaction method. The crystalline phases of the sintered samples were studied by the X-ray diffraction technique. Scanning electron microscopy (SEM) micrographs were taken to understand the microstructure of...
This paper briefly reports on research and applications of medical piezoelectrical ceramic ultrasonic transducer materials, high-performance medical ultrasonic imaging transducers in present work, then, some problems of the piezoelectric materials and devices used for the ultrasonic medicine which need further researches are pointed.
In this letter, MnO2-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT-6) lead-free piezoelectric ceramics were synthesized by solid state reaction, and the microstructure and electrical properties of the ceramics were investigated. X-ray diffraction (XRD) reveals that all specimens take on single perovskite type structure, and the diffraction peaks shift to a large angle as the MnO2 addition increases. Scanning...
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