Piezoelectric properties of mechanochemically processed 0.67BiFeO3-0.33BaTiO3 ceramics. Issue 2 (February 2023)

• Record Type: Journal Article
• Authors: Ferrero, Gianni; Astafiev, Konstantin; Ringgaard, Erling; de Oliveira, Leonardo Soares; Sudireddy, Bhaskar Reddy; Haugen, Astri Bjørnetun; Žiberna, Katarina; Malič, Barbara; Rojac, Tadej
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 2(2023)
• Page Start: 350
• Page End: 361
• Publication Date: 2023-02
• Subjects: Mechanochemical activation -- BiFeO3 -- BaTiO3 -- Piezoelectricity -- Ferroelectricity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.10.024
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Solid solutions of BiFeO3 and BaTiO3 are promising lead-free piezoelectric materials, especially around the morphotropic phase boundary at 0.67BiFeO3 -0.33BaTiO3 . Still, these materials are challenged by phase instability and limited understanding of the processing-properties relationship. Here, we investigate mechanochemical activation and the use of BaTiO3 as seed particles for the 0.67BiFeO3 -0.33BaTiO3 phase. Contrary to expectations from seeding in lead-based perovskites, the BaTiO3 seeds do not promote the 0.67BiFeO3 -0.33BaTiO3 perovskite phase neither during the mechanochemical activation nor the subsequent sintering, but cause an inhomogeneous structure with remnant BaTiO3 . This results in ceramics with weaker low-field piezoelectric response than that of the unseeded route, but with higher field-induced strain, even up to 150 °C. Both routes produce ceramics of high density and without significant secondary phases visible by X-ray diffraction. This demonstrates the advantage of mechanochemical activation and the possibility to tailor the piezoelectric response of 0.67BiFeO3 -0.33BaTiO3 through the processing route.