| Texto completo | |
| Autor(es): |
Lavado, C.
;
Alkathy, Mahmoud. S.
;
Eiras, J. A.
;
Stachiotti, M. G.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING; v. 129, n. 2, p. 10-pg., 2023-02-01. |
| Resumo | |
Multiferroic Bi3.25La0.75Ti2Nb0.5(Fe1-xCox)(0.5)O-12 ceramics with x = 0, 0.3, 0.4 and 0.5 were synthesized by a conventional solid-state reaction route to evaluate the effects of cobalt doping on structural, electrical and magnetic properties. All samples display layered perovskite Aurivillius phase with typical microstructure of plate-like grains. The grain size decreases with increasing Co content, from similar to 5 mu m to similar to 1 mu m. Room-temperature dielectric permittivity values range from 160 (x = 0) to 210 (x = 0.5) with negligible frequency dispersion and losses below 0.02 in a wide frequency range. A decrease of the Curie temperature with Co addition was observed. The Co-doped ceramics display well-defined ferroelectric and ferromagnetic hysteresis loops at room temperature. The best magnetic properties are obtained for x = 0.3 and x = 0.4 with a remnant magnetization of similar to 0.1 emu/g. Butterfly-type hysteresis loops are observed for the magnetodielectric response using a measurement protocol that can be useful for other single-phase multiferroic materials. The MD coefficient does not depend on frequency and the maximum value (similar to 0.5%) is obtained for cobalt content x = 0.3. So, these multiferroic three-layer Aurivillius compounds may be considered as promising candidates for memory applications. (AU) | |
| Processo FAPESP: | 19/03110-8 - Síntese e caracterização fotovoltaica de filmes finos à base de perovskitas ferroelétricas e multiferróicas para aplicação em células solares |
| Beneficiário: | Mahmoud Saleh Mohammed Alkathy |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 17/13769-1 - Materiais multiferróicos e ferroelétricos para conversores de energia: síntese, propriedades, fenomenologia e aplicações |
| Beneficiário: | José Antonio Eiras |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |