Structural, thermal, dielectric and ferroelectric properties of K0.5Bi0.5TiO3 ceramics
| Autor: | Piotr Czaja, J. Suchanicz, A. Niewiadomski, Antoni Kania, A. Budziak |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics 02 engineering and technology Dielectric Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Pyroelectricity Dielectric spectroscopy Condensed Matter::Materials Science Tetragonal crystal system symbols.namesake Crystallography Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites symbols 0210 nano-technology Raman scattering |
| Zdroj: | Journal of the European Ceramic Society. 38:567-574 |
| ISSN: | 0955-2219 |
| Popis: | Dense K0.5Bi0.5TiO3 (KBT) lead-free ceramics were prepared by conventional solid reaction route. Their temperature behavior (up to 600 °C) was investigated by X-ray diffraction, DSC, dielectric spectroscopy and electric field-polarization technique. The first temperature dependent Raman scattering studies were also performed. X-ray and Raman scattering results show that samples exhibit a single perovskite structure with cubic symmetry at temperatures higher than approximately 400 °C and with coexistence of the cubic and tetragonal phases below this temperature. Two structural phase transitions between tetragonal phases in temperature range 200–225 °C and between tetragonal and cubic ones near 400 °C are observed. The content of the tetragonal phase increases with decreasing temperature and at room temperature it reaches more than 70%. Temperature- dependent P-E loops and pyroelectric data revealed a polar behavior in KBT up to about 400 °C, which means that the intermediate phase (∼270–380 °C) is rather ferroelectric than antiferroelectric. |
| Databáze: | OpenAIRE |
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