High frequency needle ultrasonic transducers based on Mn doped piezoelectric single crystal

Abstract

This paper describes the design, fabrication and imaging application of high frequency needle-type transducers based on manganese doped Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )-PbTiO 3 (Mn: PIN-PMN-PT) piezoelectric single crystals. The grown Mn: PIN-PMN-PT single crystals have a piezoelectric coefficient d 33 of 1200 pc/N, an electromechanical coupling factor k t of 54%, and Curie temperature of 220 °C. Mn: PIN-PMN-PT single crystals based transducers with one and two matching layers show center frequency of 48 MHz, 47.1 MHz and −6 dB bandwidth of 36.7%, 41.8% respectively. Zebrafish have been imaged by these transducers, which shows the potential applications of these Mn: PIN-PMN-PT single crystals based transducers in high resolution biological imaging. Electrical impedance and phase of Mn: PIN-PMN-PT transducers were measured at temperature from 40 °C to 160 °C and the trend of changes was explained by the Mason model in different situations. It was found that the Mn: PIN-PMN-PT can maintain good performance at temperatures as high as 140 °C. The result shows that the Mn: PIN-PMN-PT has superior piezoelectric properties comparable to PIN-PMN-PT and its thermal stability is higher than PMN-PT. • High frequency transducer based on Mn doped PIN-PMNPT single crystals were fabricated and characterized. • Mn doped PIN-PMNPT transducers show good temperature stability and acoustic properties. • The Impedance-phase plots of transducer at different temperature are well explained and simulated by Mason model..