Crystal Structure Refinement and Magnetic Properties of Fe4(P2O7)3 Studied by Neutron Diffraction and Mössbauer Techniques
作者： L.K Elbouaanani , B Malaman , R Gérardin , M Ijjaali
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摘要: Abstract Fe 4 (P 2 O 7 ) 3 was prepared from Fe(PO and FePO at 940°C under oxygen. The unit cell is monoclinic, space group P 1 / n , with a =7.389(2) A, b =21.337(1) c =9.517(2) β =90(1)°, Z =4. crystallographic structure has been determined single crystal through direct methods difference Fourier synthesis refined to R =0.10 ( w =0.09). three-dimensional framework built up 9 clusters of two face-sharing octahedra, linked by bent diphosphates (P–O–P∼156°). antiferromagnetic below T N =50 K. magnetic determinated means powder neutron diffraction. There are four iron sublattices corresponding the crystallographically distinct atoms. moments antiferromagnetically coupled inside dimers, in agreement Goodenough rules. They parallel axis have 4.55(5) μ B value 1.7 interactions discussed. Mossbauer spectra fitted doublets sextuplets paramagnetic states, respectively. Their rather high isomer shifts explained inductive effect.
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