High energy-storage density under low electric fields and improved optical transparency in novel sodium bismuth titanate-based lead-free ceramics. Issue 1 (January 2020)

• Record Type: Journal Article
• Authors: Zhang, Lei; Pu, Yongping; Chen, Min; Wei, Tianchen; Keipper, Wade; Shi, Ruike; Guo, Xu; Li, Run; Peng, Xin
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 1(2020)
• Page Start: 71
• Page End: 77
• Publication Date: 2020-01
• Subjects: High energy-storage density -- Phase transition -- Sodium bismuth titanate -- High temperature capacitors; 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.2019.09.001
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A novel (1- x )Na0.5 Bi0.5 TiO3 - x BaHfO3 (abbreviated as (1- x )NBT- x BH) transparent ceramic was fabricated by the solid state reaction method. X-ray diffraction analysis showed that NBT-based transparent ceramics exhibit a cubic-like perovskite structure and the solid solubility of BH in NBT reached to 0.15. The Landau-Devonshire theory and I-E curves revealed that the transition between the antiferroelectric like phase and the ferroelectric phase deeply relies on the variation of composition and free energy. One sample ( x = 0.15) was found to show a high dielectric constant (˜2418±10%) over the temperature range 57–400 °C. These ceramics also exhibited a high discharge energy density ( W d ) of 2.1 J/cm 3 and a high maximum polarization P m of 34 μC/cm 2 under relatively low electric fields which were less than 175 kV/cm. There was also high transparency in the visible spectra (more than 0.5) when the sample thickness was 250 μm.