Achieving both large piezoelectric constant and low dielectric loss in BiScO3-PbTiO3–BiO3 high-temperature piezoelectric ceramics

Abstract

BiScO3–PbTiO3 binary ceramics own both high Curie temperature and prominent piezoelectric properties, while the high dielectric loss needs to be reduced substantially for practical application especially at high temperatures. In this work, a ternary perovskite system of (1–[Formula: see text]–[Formula: see text])BiScO3–[Formula: see text]PbTiO3–[Formula: see text]Bi([Formula: see text][Formula: see text])O3 (BS–[Formula: see text]PT–[Formula: see text]BMS) with [Formula: see text] = 0.005, [Formula: see text] = 0.630–0.645 and [Formula: see text] = 0.015, [Formula: see text] = 0.625–0.640 was prepared by the traditional solid-state reaction method. The phase structure, microstructure, dielectric/piezoelectric/ferroelectric properties were studied. Among BS–[Formula: see text]PT–[Formula: see text]BMS ceramic series, the BS–0.630PT–0.015BMS at morphotropic phase boundary possesses the reduced dielectric loss factor (tan[Formula: see text] = 1.20%) and increased mechanical quality factor ([Formula: see text][Formula: see text] = 84), and maintains a high Curie temperature ( [Formula: see text] = 410[Formula: see text]C) and excellent piezoelectric properties ([Formula: see text][Formula: see text] = 330 pC/N) simultaneously. Of particular importance, at elevated temperature of 200[Formula: see text]C, the value of tan[Formula: see text] is only increased to 1.59%. All these properties indicate that the BS–0.630PT–0.015BMS ceramic has great potential for application in high-temperature piezoelectric devices.

Keywords

• High-temperature piezoelectric ceramics
• BiScO3–PbTiO3
• morphotropic phase boundary
• BiO3