Effective dielectric function of BaTiO3-NiO composites
| Autor: | Lucía Fernández-García, Viktor Bovtun, Dmitry Nuzhnyy, Jose Menendez, P. Bednyakov, Tetyana Ostapchuk, T. Rodriguez-Suarez, Maxim Savinov, Martin Kempa, Jan Petzelt |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Non-blocking I/O Spark plasma sintering 02 engineering and technology Dielectric Conductivity 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Ferroelectricity visual_art Percolation 0103 physical sciences visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology |
| Zdroj: | 2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop (ISAF/ECAPD/PFM). |
| Popis: | Using spark plasma sintering we have processed and studied two ceramic composites of 70 vol% BaTiO3 (BTO) and 30 vol% NiO with standard and core-shell microstructure. Quantitative broadband dielectric spectroscopy up to the infrared range at 10-450 K showed substantial differences between both composites. The evaluated dielectric spectra revealing all three ferroelectric phase transitions were compared with modelled spectra using three different models based on effective medium approximation (Bruggeman, Lichtenecker and coated spheres). The results, including the soft-mode dynamics, were discussed using the concept of the BTO percolation. |
| Databáze: | OpenAIRE |
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