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High energy-storage density under low electric fields and improved optical transparency in novel sodium bismuth titanate-based lead-free ceramics |
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| Affiliation: | 1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China;2. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an, 710021, China;1. College of Life Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China;2. School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China |
| Abstract: | A novel (1-x)Na0.5Bi0.5TiO3-xBaHfO3 (abbreviated as (1-x)NBT-xBH) 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 (Wd) of 2.1 J/cm3 and a high maximum polarization Pm of 34 μC/cm2 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. |
| Keywords: | High energy-storage density Phase transition Sodium bismuth titanate High temperature capacitors |
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