| Autor: |
Delacotte, Charlene, Hüe, Florian, Bréard, Yohann, Pelloquin, Denis |
| Zdroj: |
Key Engineering Materials; June 2014, Vol. 617 Issue: 1 p237-240, 4p |
| Abstrakt: |
An efficient synthesis route is proposed to obtain single powder CaFe5O7 ceramic. This complex structure can be described as an intergrowth between one CaFe2O4 unit 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 the hkl conditions 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: |
Supplemental Index |
| Externí odkaz: |
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