Structure resolution by electron diffraction tomography of the complex layered iron-rich Fe-2234-type Sr 5 Fe 6 O 15.4

Christophe Lepoittevin (1)

1 NEEL - MRS - Matériaux, Rayonnements, Structure

The crystal structure of the strontium ferrite Sr 5 Fe 6 O 15.4 , was solved by direct methods on electron diffraction tomography data acquired on a transmission electron microscope. The refined cell parameters are a¼ 27.4047(3) Å, b ¼ 5.48590(7) Å and c¼ 42.7442(4) Å in Fm2m symmetry. Its structure is built up from the intergrowth sequence between a quadruple perovskite-type layer with a complex rock-salt (RS)-type block. In the latter iron atoms are found in two different environments : tetragonal pyramid and tetrahedron. The structural model was refined by Rietveld method based on the powder X-ray diffraction pattern.

Mots clés: Powder X-ray diffraction; Electron diffraction tomography; Complex strontium iron based structure

Domaines: Physique [physics]

Christophe Lepoittevin. Structure resolution by electron diffraction tomography of the complex layered iron-rich Fe-2234-type Sr 5 Fe 6 O 15.4. Journal of Solid State Chemistry, 2016, 242 (Part 1), pp.228. ⟨10.1016/j.jssc.2016.08.004⟩. ⟨hal-01400566⟩