3results about How to "Piezoelectric constant" patented technology

The invention relates to the technical field of piezoelectric ceramic materials, in particular to potassium-sodium niobate-based lead-free ceramic suitable for high-power devices and a preparation method, the chemical general formula of the potassium-sodium niobate-based lead-free ceramic is 0.96 (K < 0.45 > Na < 0.55 >) NbO < 3-0.04 > Bi < 0.5 + x > Na < 0.5 > ZrO < 3-0.005 > CuO, and x is one of 0, 0.03, 0.05, 0.08 and 0.10. According to the potassium-sodium niobate-based lead-free ceramic suitable for the high-power device and the preparation method, the potassium-sodium niobate-based lead-free ceramic has excellent comprehensive electrical properties including high piezoelectric constant, high quality factor, high Curie temperature and low dielectric loss, and is suitable for being applied to high-power electronic equipment.

The application provides an ultrasonic transducer, a preparation method thereof and an electronic device. The preparation method of the ultrasonic transducer comprises the following steps: coating a piezoelectric polymer solution on a first electrode, drying under the condition that the relative humidity is less than 30%, and forming a piezoelectric film; sequentially performing crystallization and polarization on the piezoelectric film, and forming a piezoelectric layer; and forming a second electrode on the piezoelectric layer, so as to obtain the ultrasonic transducer. Through the preparation process, the transparency and piezoelectric constant of the formed piezoelectric layer can be improved, and the performance of the ultrasonic transducer is optimized.

A fluoropolymer resin piezoelectric film has a retardation of 100 nm or more and 2000 nm or less, an internal haze of less than 1.7%, and a piezoelectric constant d measured at 21 measurement points determined along the fast axis. 33 The average value is above 6.0 pC / N and below 40.0 pC / N, and the piezoelectric constant d 33 The standard deviation is below 2.0 pC / N.