High-temperature stability of dielectric and energy-storage properties of weakly-coupled relaxor (1-x)BaTiO3-xBi(Y1/3Ti1/2)O3 ceramics
| Autor: | Xueyan Xi, Xian Du, Huiling Du, Cuiying Ma, Le Kang, Jia Liu, Hongpei Ran |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Permittivity Materials science Process Chemistry and Technology Analytical chemistry 02 engineering and technology Dielectric Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Tetragonal crystal system Hysteresis symbols.namesake 0103 physical sciences Materials Chemistry Ceramics and Composites symbols 0210 nano-technology Raman spectroscopy Temperature coefficient |
| Zdroj: | Ceramics International. 47:25029-25036 |
| ISSN: | 0272-8842 |
| Popis: | Lead-free (1-x)BaTiO3-xBi(Y1/3Ti1/2)O3 ceramics (abbr. (1-x)BT-xBYT) were synthesized via a solid state process. X-ray diffraction (XRD) measurements and Raman spectra reveal that, for x ˃ 0.05, the ceramics structure changes from a ferroelectric tetragonal to a pseudo-cubic phase at room temperature. Dielectric tests indicate that the ceramics exhibit a relaxor behavior, the temperature (Tm) at which the maximum dielectric constant (em) is obtained shifts towards lower values. As the BYT content increases, the dielectric dispersion factor (γ) increases from 0.99 to 1.86, the temperature coefficient of permittivity (TCϵ) decreases to ~60 ppm/°C, and the capacitance variation is within temperature coefficient of capacitance (TCC) ≤ 15% in the temperature range from RT to 400 °C (x = 0.20). Furthermore, as the BYT content increases, high polarization maxima (Pmax), low remnant polarization (Pr), and slim P-E hysteresis loops can be observed. An energy storage density (Wrec) of 1.02 J/cm3 and energy efficiency (η) of 78% were achieved for x = 0.15, while these amounted to 0.77 J/cm3 and 90% for x = 0.2. Moreover, good temperature stability of energy storage properties is also obtained. These results indicate that the as-synthesized (1-x)BT-xBYT ceramics are potential lead-free materials for energy storage applications. |
| Databáze: | OpenAIRE |
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