Investigation of a new lead-free (1-x-y)BNT-xBKT-yBZT piezoelectric ceramics. (August 2017)

• Record Type: Journal Article
• Authors: Sumang, Rattiphorn; Bongkarn, Theerachai; Kumar, Nitish; Kamnoy, Manlika
• Is Part Of: Ceramics international. Volume 43(2017)Supplement 1
• Page Start: S102
• Page End: S109
• Publication Date: 2017-08
• Subjects: Perovskite -- Piezoelectric properties -- Dielectric properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.239
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Lead-free solid solutions (1- x - y )Bi0.5 Na0.5 TiO3 – x Bi0.5 K0.5 TiO3 – y BaZr0.05 Ti0.95 O3 (0≤ y ≤0.25 and 0.10≤ x ≤0.30) were prepared by using a solid-state reaction method. The effect of y (BZT) and x (BKT) contents on phase, microstructure, and electrical properties was investigated. The XRD and Raman spectra exhibited co-existing rhombohedral and tetragonal phases throughout the entire compositional range with the tetragonal phase becoming dominant at higher y (BZT) and x (BKT) concentrations. While an increased in y (BZT) content promotes grain growth, the addition of x (BKT) suppresses it. The diffuseness exponent ( γ ) of ceramics increased from 1.82 to 1.92 and from 0.05 to 1.77 when increased of y (BZT) and x (BKT) contents, respectively, which showed the diffuse phase transition behavior. The change in P - E loops of ceramics was closely related to relative stability of long-range order. The results reflected a competition between compositions induced tetragonality and disorder. It appears that small amount of x (BKT) and y (BZT) favor ergodic behavior, which is indicative of increased disorder and stable PNRs at zero field conditions. However, with increased amount of x (BKT) and y (BZT), non-ergodic behavior is re-introduced, most likely due to increased tetragonality. The results indicated that the addition y (BZT) and x (BKT) significantly enhances the field-induced strain in (1- x - y )Bi0.5 Na0.5 TiO3 – x Bi0.5 K0.5 TiO3 – y BaZr0.05 Ti0.95 O3 ceramics.