Transmission Electron Microscopy Study of CaFe5O7 : Evidence of a Monoclinic Superstructure at Room Temperature

Charlene Delacotte; Florian Hüe; Yohann Bréard; Denis Pelloquin

doi:10.4028/www.scientific.net/KEM.617.237

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Transmission Electron Microscopy Study of CaFe₅O₇ : Evidence of a Monoclinic Superstructure at Room Temperature
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 617Transmission Electron Microscopy Study of CaFe5O7...

Transmission Electron Microscopy Study of CaFe₅O₇ : Evidence of a Monoclinic Superstructure at Room Temperature

Abstract:

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 (a_o =3.05 Å, b_o = 10.05 Å and c_o = 18 Å) according to the following metric a_m=2c_o, b_m=c_o, c_m=b_o/2sinβ and β=106.74°.

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Periodical:

Key Engineering Materials (Volume 617)

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237-240

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https://doi.org/10.4028/www.scientific.net/KEM.617.237

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Online since:

June 2014

Authors:

Charlene Delacotte*, Florian Hüe, Yohann Bréard, Denis Pelloquin

Keywords:

Diffraction Data, Ferrite, Transmission Electron Microscopy (TEM)

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