Electrocaloric effect and pyroelectric energy harvesting of (0.94 − x)Na0.5Bi0.5TiO3-0.06BaTiO3-xSrTiO3 ceramics. Issue 8 (July 2017)

• Record Type: Journal Article
• Authors: Luo, Laihui; Jiang, Xijie; Zhang, Yuanyuan; Li, Kaixuan
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 8(2017)
• Page Start: 2803
• Page End: 2812
• Publication Date: 2017-07
• Subjects: Ferroelectric -- Electrocaloric effect -- Pyroelectric energy harvesting -- Depolarization temperature; 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.2017.02.047
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Ceramics with the composition (0.94 − x )Na0.5 Bi0.5 TiO3 –0.06BaTiO3 – x SrTiO3 (NBBST x ) where x = 0.10, 0.15, 0.20, and 0.25 were synthesized by a conventional solid-state reaction method to investigate their electrocaloric effect (ECE) and pyroelectric energy harvesting (PEH) properties. The ferroelectric, dielectric, and pyroelectric properties of the prepared ceramics were measured and discussed. It is found that the strontium titanate (ST) content and bias field greatly affect the ferroelectric–relaxor transition. Increasing ST content lowers the depolarization temperature of the ceramics, and both the ECE and PEH behavior of the ceramics strongly depend on their ST content because of the composition-induced decrease of the ferroelectric–relaxor transition temperature. The present investigation demonstrates that the ECE and PEH properties of NBBST x ceramics can be tuned by introducing ST. Furthermore, a high PEH density of 425 kJ/m 3 is obtained for NBBST0.20, which is much higher than those of conventional Pb-based ferroelectrics.