Investigation by EPR of defects in polycrystalline samples of BiMn2O5
| Full text | |
| Author(s): |
Santos, G. M.
[1]
;
Silva, D. M.
[1]
;
Freitas, V. F.
[1]
;
Dias, G. S.
[1]
;
Coelho, A. A.
[2]
;
Pal, M.
[3]
;
Santos, I. A.
[1]
;
Cotica, L. F.
[1, 3]
;
Guo, R.
[3]
;
Bhalla, A. S.
[3]
Total Authors: 10
|
| Affiliation: | [1] Univ Estadual Maringa, Dept Phys, Maringa, Parana - Brazil
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Campinas, SP - Brazil
[3] Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 - USA
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Ferroelectrics; v. 460, n. 1, p. 108-116, FEB 17 2014. |
| Web of Science Citations: | 6 |
| Abstract | |
The lead-free AlFeO3-based compounds are attractive multiferroic materials, as those present piezoelectricity and ferrimagnetism at low temperatures. In this work the synthesis and ferroic properties of AlFeO3-based ceramics were investigated. Stoichiometric proportions of the precursors - alpha-Fe2O3 and alpha-Al2O3 - were milled and sintered to obtain AlFeO3 ceramics. Also, AlFeO3 ceramics doped with 2at% of Nb2O5 or MnO2 were sintered in oxygen flow at 1700K. The crystal structure of the samples was studied by X-ray diffraction. The diffractograms were refined by the Rietveld method. The results obtained from refinements showed an orthorhombic symmetry with space group Pna2(1). Dielectric, ferroelectric and magnetic investigations suggested a magnetoelectric coupling between the electric and magnetic orderings at temperatures below similar to 160K for AlFeO3, Al(Fe0.98Nb0.02)O-3 and Al(Fe0.98Mn0.02)O-3, where the compositions show the ferromagnetic and ferroelectric ordering. (AU) | |
| FAPESP's process: | 08/04025-0 - Nanostructured multifunctional multiferroic materials: synthesis, properties, phenomenology and applications |
| Grantee: | José Antonio Eiras |
| Support type: | Research Projects - Thematic Grants |