title: 1-3 piezoelectric composites for high temperature transducer applications.
abstract: High temperature Pb(Zr,Ti)O3/epoxy 1-3 composites were fabricated using the dice and fill method. The epoxy filler was modified with glass spheres in order to improve the thermal reliability of the composites at elevated temperatures. Temperature dependent dielectric and electromechanical properties of the composites were measured after aging at 250°C with different dwelling times. Obvious cracks were observed and the electrodes were damaged in the composite with unmodified epoxy after 200 hours, leading to the failure of the composite. In contrast, composites with >12 vol% glass sphere loaded epoxies were found to exhibit minimal electrical property variation after aging for 500 hours, with dielectric permittivity, piezoelectric coefficient and electromechanical coupling being on the order of 940, 310pC/N and 57%, respectively. This is due to the improved thermal expansion behavior of the modified filler.
authors.affiliation: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, P. R. China ; Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Lili
authors.initials: L
authors.lastname: Li
authors.forename: Shujun
authors.initials: S
authors.lastname: Zhang
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Xu
authors.forename: Fei
authors.initials: F
authors.lastname: Wen
authors.forename: Xuecang
authors.initials: X
authors.lastname: Geng
authors.forename: Hyeong Jae
authors.initials: HJ
authors.lastname: Lee
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Shrout