Large strain and temperature-insensitive piezoelectric effect in high-temperature piezoelectric ceramics

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2018, Vol.6 (3), p.456-463
• Main Authors: Liu, Zhuang, Zhao, Chunlin, Li, Jing-Feng, Wang, Ke, Wu, Jiagang
• Format: Article
• Language: English
• Subjects: Curie temperature; Electrical properties; Piezoelectric actuators; Piezoelectric ceramics; Piezoelectricity; Stability
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c7tc04975g

Here we have, for the first time, reported a giant unipolar strain of ∼0.45% and a temperature-insensitive piezoelectric effect ( d 33 ∼ 520 pC N −1 ) in (1 − y )[ x BiScO 3 -(1 − x )PbTiO 3 ]- y Bi(Zn 1/2 Ti 1/2 )O 3 (BS-PT-BZT) ceramics with a high Curie temperature of T C ∼ 425 °C. The morphotropic phase boundary (MPB) of rhombohedral-tetragonal (R-T) phase coexistence can be driven in samples with x = 0.36 and y = 0.01, which is mainly responsible for the enhancement of electrical properties and temperature stability. PFM test results indicate that the addition of BZT can improve the local piezoelectric response of domains, which may lead to the enhancement of piezoelectricity and strain. In addition, ceramics with BZT exhibit good temperature stability of electrical properties. We believe that these materials can be well applied in the field of high-temperature piezoelectric actuators. Here we have, for the first time, reported a giant unipolar strain of ∼0.45% and a temperature-insensitive piezoelectric effect ( d 33 ∼ 520 pC N −1 ) in (1 − y )[ x BiScO 3 -(1 − x )PbTiO 3 ]- y Bi(Zn 1/2 Ti 1/2 )O 3 (BS-PT-BZT) ceramics with a high Curie temperature of T C ∼ 425 °C.