Relaxor behaviour and nonlinear dielectric properties of lead-free BZT–BZN composite ceramics. Issue 2 (15th January 2021)

• Record Type: Journal Article
• Authors: Sun, Zheng; Liu, Wenxu; Li, Qiuyang; Tao, Zhi; Han, Yemei
• Is Part Of: Ceramics international. Volume 47:Issue 2(2021)
• Page Start: 2086
• Page End: 2093
• Publication Date: 2021-01-15
• Subjects: Ceramics -- Microstructure -- X-ray diffraction -- Dielectric properties -- PNRs; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.09.041
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To improve the dielectric performance of Ba(Zr0.2 Ti0.8 )O3 -based ceramics, (1-x) Ba(Zr0.2 Ti0.8 )O3 -xBi(Zn2/3 Nb1/3 )O3 composite ceramics (as short as (1-x) BZT20-xBZN) were synthesised using a solid-state reaction. The effects of Bi(Zn2/3 Nb1/3 )O3 on the microstructure and dielectric properties were studied. Stable cubic symmetry and polar nanoregions (PNRs)-related first-order Raman modes were observed as the amount of BZN increased. The 0.94BZT20–0.06BZN sample exhibited improved dielectric constants with a higher degree of relaxor behaviour (γ = 1.91). BZN-dependent dielectric nonlinearity was observed under an applied electric field. The evolution of the relaxor behaviour and dielectric nonlinearity in the (1-x) BZT20-xBZN composite ceramics were related to PNRs variations. The largest figure of merit (~65) was obtained for the 0.94BZT20–0.06BZN ceramics, while the dielectric tunability was 75%.