Mn doping effects on electric properties of 0.93(Bi0.5Na0.5)TiO3‐0.07Ba(Ti0.945Zr0.055)O3 ceramics

• Published in: Journal of the American Ceramic Society Vol. 101; no. 7; pp. 2996 - 3004
• Main Authors: Zhang, Xingru, Jiang, Guicheng, Guo, Feifei, Liu, Danqing, Zhang, Shantao, Yang, Bin, Cao, Wenwu
• Format: Journal Article
• Language: English
• Published: Columbus Wiley Subscription Services, Inc 01.07.2018
• Subjects: Ceramics; Depolarization; depolarization temperature; Doping; Electric properties; Ferroelectric materials; Ferroelectricity; ferroelectricity/ferroelectric materials; lead‐free ceramics; Manganese; piezoelectric materials/properties; Piezoelectricity; pyroelectricity; Relaxors; Transition temperature
• DOI: 10.1111/jace.15457
• ISSN: 0002-7820

The validity of Mn element on 0.93(Bi0.5Na0.5)TiO3‐0.07Ba(Ti0.945Zr0.055)O3 ceramics (BNT‐BZT‐xMn) is certified by doping. On account of multiple effects introduced by Mn, the appropriate Mn content facilitates property improvement effectively. Compared with pure BNT‐BZT, d33 of the component x = 0.25 increases about 8% up to 187 pC/N and Qm of the component x = 1 increases about 84% up to 197. Thermally stimulated depolarization currents (TSDC) measurement reveals Mn additive is helpful to pyroelectric properties as well. The Mn‐doped component x = 0.125 exhibits better pyroelectric performance at room temperature. Corresponding pyroelectric coefficient and the figures of merit reach up to 0.061 μC/(cm2 °C), Fi=217 pm/V, Fν = 0.023 m2/C, and Fd = 12.6 μPa−1/2, respectively, even superior to lead‐based ceramics. Similar pyroelectric advantage is also observed in the component x = 0.5 near depolarization temperature Td. Mn doping has slight harmful influence on the ferroelectric‐to‐relaxor transition temperature TF−R, as well as Td, but hardly shows restriction on application. These results confirm Mn doping is an available strategy to improve BNT‐based ceramics. Therefore, Mn‐doped BNT‐BZT ceramics will be excellent candidates in area of high‐power piezoelectric application and pyroelectric detectors.