Four-fold multifunctional properties in self-organized layered ferrite
| Autor: | Lavinia Curecheriu, Liliana Mitoseriu, Alain Pignolet, Catalin Harnagea, Vincenzo Buscaglia, Vasile Adrian Surdu, Federico Rosei, Adelina-Carmen Ianculescu, Ilaria Pallecchi, Maria Teresa Buscaglia, Bogdan Stefan Vasile |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Piezoelectric coefficient Ferroelectricity Magnetic domain High resolution transmission electron microscopy (HRTEM) 02 engineering and technology Dielectric 01 natural sciences Seebeck coefficient 0103 physical sciences Thermoelectric effect Materials Chemistry High-resolution transmission electron microscopy Thermoelectric propertie 010302 applied physics Condensed matter physics Magnetoresistivity Process Chemistry and Technology Piezoresponse force microscopy (PFM) 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetic force microscopy (MFM) Piezoresponse force microscopy Ceramics and Composites 0210 nano-technology |
| Zdroj: | Ceramics international 46 (2020): 28621–28630. doi:10.1016/j.ceramint.2020.08.021 info:cnr-pdr/source/autori:Curecheriu L.; Harnagea C.; Buscaglia M.T.; Pallecchi I.; Vasile B.S.; Surdu V.-A.; Ianculescu A.-C.; Pignolet A.; Rosei F.; Mitoseriu L.; Buscaglia V./titolo:Four-fold multifunctional properties in self-organized layered ferrite/doi:10.1016%2Fj.ceramint.2020.08.021/rivista:Ceramics international/anno:2020/pagina_da:28621/pagina_a:28630/intervallo_pagine:28621–28630/volume:46 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.08.021 |
| Popis: | Four different functional properties at room temperature were found in Ba12Fe28Ti15O84 quaternary ferrite ceramics: a thermoelectric character with a prominent Seebeck coefficient of -400 μV/K, a strong ferrimagnetic character and weak magnetoresistivity, non-linear dielectric character (tunability) and ferro/piezoelectric response. The complex crystalline structure with a naturally occurring self-organized layered structure was mapped by High Resolution Transmission Electron Microscopy. A n-type conduction was found for optimized samples, consistent with the negative Seebeck coefficient. The presence of magnetic domains with a lateral size ranging from few hundreds of nanometers, up to few microns, extended over several grains indicates a strong intergranular magnetic interaction. Local ferroelectric switching as revealed by piezoresponse force microscopy showed a relatively weak effective piezoelectric coefficient with a remnant value of 0.5 p.m./V and a clockwise cycling direction, which was attributed to an effective negative piezoelectric coefficient. The switching behavior was described as originating from the material’s nanoscale layered complexity, with a strong anisotropy of its dielectric and ferro/piezoelectric local properties. |
| Databáze: | OpenAIRE |
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