1. Neutron powder diffraction study of the layer organic–inorganic hybrid iron(II) methylphosphonate-hydrate, Fe[(CD3PO3)(D2O)]
- Author
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Léone, Philippe, Bellitto, Carlo, Bauer, Elvira M., Righini, Guido, André, Gilles, and Bourée, Françoise
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NEUTRON diffraction , *IRON , *MAGNETIC properties of metals , *TEMPERATURE , *FUMARATES , *PHOSPHONATES , *MAGNETIC structure , *CRYSTALS - Abstract
Abstract: The crystal and magnetic structures of the hybrid organic–inorganic layer compound Fe[(CD3PO3)(D2O)] have been studied by neutron powder diffraction as a function of temperature down to 1.5K. The neutron diffraction pattern recorded at 200K shows that the fully deuterated compound crystallizes in one of the two known forms of the undeuterated Fe[(CH3PO3)(H2O)]. The crystal structure is orthorhombic, space group Pmn21, with the following unit-cell parameters: a=5.7095(1)Å, b=8.8053(3)Å and c=4.7987(1)Å; Z=2. The crystal structure remains unchanged on cooling from 200 to 1.5K. Moreover, at low temperature, Fe[(CD3PO3)(D2O)] shows a commensurate magnetic structure (k=(0,0,0)). As revealed by bulk susceptibility measurements on Fe[(CH3PO3)(H2O)], the magnetic structure corresponds to a canted antiferromagnet with a critical temperature T N=25K. Neutron powder diffraction reveals that below T N=23.5K the iron magnetic moments in Fe[(CD3PO3)(D2O)] are antiferromagnetically coupled and oriented along the b-axis, perpendicular to the inorganic layers. No ferromagnetic component is observable in the neutron powder diffraction experiment, due to its too small value (<0.1μ B). [Copyright &y& Elsevier]
- Published
- 2008
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