Crystal and magnetic structures of the CaFe2+nO4+n family’s members
we have revisited the Ca-Fe-O system, focusing our attention on the family CaFe2+nO4+n. Terms n = 1, 2 and 3 have been isolated as single phase bulk ceramics-the syntheses are reproducible.Firstly, we have shown by building of the reciprocal spaces (E.D.) at room temperature that the real symmetry of compounds is not orthorhombic (as it was reported) but monoclinic (S.G. P21). Moreover, X-ray Le bail refinements Vs temperature, reveal that oxides go through a structural transition TS (TS= 350K for n =3, TS= 330K for n =2 and TS= 300K for n =1). This has been clearly confirmed by E.D. observations for which extra dots are detected at T<TS. Adding to that, the thermal dependences of the magnetic susceptibility and electronic conductivity show transitions at T=TS indicating an electro-magneto-structural coupling which as has never been reported. we ask for 3 days of beam time on the D2b diffractometer which would allows us to performed structural and magnetic characterizations
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breard; DELACOTTE Charlene; PELLOQUIN Denis and SUARD Emmanuelle. (2013). Crystal and magnetic structures of the CaFe2+nO4+n family’s members. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2267