Relaxor behavior of BaTiO3-BiYO3 perovskite materials for high energy density capacitors. Issue 6 (15th April 2017)

• Record Type: Journal Article
• Authors: Wei, Meng; Zhang, Jihua; Zhang, Miaomiao; Yao, Zongying; Chen, Hongwei; Yang, Chuanren
• Is Part Of: Ceramics international. Volume 43:Issue 6(2017)
• Page Start: 4768
• Page End: 4774
• Publication Date: 2017-04-15
• Subjects: Dielectric property -- Breakdown strength -- Energy density -- BaTiO3 -- Ceramics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.11.148
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Dielectric materials with high dielectric constant and breakdown voltage are very promising for pulsed energy storage applications. In this paper, (1-x) BaTiO3 -xBiYO3 (x=0–0.5) ceramics were synthesized using conventional solid-state reaction method. The ceramic structure transformed from ferroelectric tetragonal phases (x≤0.5) to pseudo-cubic phases (x≥0.1). When x=0.2, beyond the solid solubility limit of BaTiO3 -BiYO3, the second phase and glassy phases were formed, accompanying lattice parameter excursion. It revealed a gradual change from classic ferroelectric behavior in pure BaTiO3 to highly diffusive and dispersive relaxor-like characteristics with BiYO3 content increasing. It exhibited high polarization maximum and low remnant polarization, which was favorable for energy storage in (1-x)BaTiO3 -xBiYO3 ceramics, due to the disrupted long polarization, the created weak coupling and the formed second phase. Furthermore, the nonlinearity of the (1-x)BaTiO3 -xBiYO3 ceramics were weakened obviously. A maximum energy storage density of 0.316 J/cm 3 at 66 kV/cm with relative high energy efficiency of 82.7% was achieved in 0.8BaTiO3 -0.2BiYO3 ceramic, which indicated that (1-x)BaTiO3 -xBiYO3 ceramics were promising lead-free relaxor materials for energy storage applications.