Transmission Electron Microscopy Study of CaFe5O7 : Evidence of a Monoclinic Superstructure at Room Temperature
| Autor: | Florian Hüe, C. Delacotte, Denis Pelloquin, Yohann Bréard |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Mechanical Engineering Monoclinic symmetry Crystallography Electron diffraction Mechanics of Materials Transmission electron microscopy visual_art visual_art.visual_art_medium Ferrite (magnet) General Materials Science Orthorhombic crystal system Ceramic Crystal twinning Monoclinic crystal system |
| Zdroj: | Key Engineering Materials. 617:237-240 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.617.237 |
| Popis: | An efficient synthesis route is proposed to obtain single powder CaFe5O7ceramic. This complex structure can be described as an intergrowth between one CaFe2O4unit and n= 3 slices of FeO Wustite-type structures. A fine structural study has been carried out at room temperature by transmission electron microscopy (TEM) observations (ED and HREM). The analysis of these data has revealed a supercell with a monoclinic symmetry associated to some twinning phenomena. From thehklconditions deduced to electron diffraction study, the centrosymmetric P21/m setting can be proposed. This monoclinic cell exhibit close relationships with the previous one reported as orthorhombic (ao=3.05 Å, bo= 10.05 Å and co= 18 Å) according to the following metric am=2co, bm=co, cm=bo/2sinβ and β=106.74°. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|