High depolarization temperature and large piezoelectricity in BiScO3-PbTiO3-Bi(Zn1/2Ti1/2)O3 piezoelectric energy harvesting ceramics

Piezoceramics with a high depolarization temperature (T-d) and excellent piezoelectricity are ideal materials for constructing advanced high-temperature piezoelectric energy harvesters (HT-PEHs). Herein, the Bi(Zn1/2Ti1/2)O-3 (BZT) unit with a large tetragonality was added into the BiScO3-PbTiO3 (BS-PT) high-temperature piezoelectric matrix under the guidance of morphotropic phase boundary (MPB) manipulation and a lattice distortion modulation strategy. Based on the dual effects of linear expansion of MPB and the enhancement of lattice tetragonality, the perovskite-type 0.36BS-0.62PT-0.02BZT MPB composition shows a T-d of up to 418 degrees C and a large high-temperature piezoelectric constant (d(33)) of 932 pC N-1. The above comprehensive high-temperature characteristics are far superior to those of most reported perovskite piezoceramics. Moreover, the HT-PEH assembled using the 0.36BS-0.62PT-0.02BZT MPB ceramic exhibits excellent output power density of 80 mu W cm(-3) and ability to drive microelectronic devices even at 400 degrees C. This work demonstrates that the BS-PT-BZT material is a promising candidate for high-temperature piezoelectric energy harvesting applications.