Abstract
FeMoO 4Cl crystallizes in the tetragonal system with unit cell dimensions a = 6.672(3)and c = 5.223(3)A˚in space group P4/nmmwith Z = 2. The structure is built from FeMoO 4Cl layers stacked along the c axis and is closely related to α-VOPO 4-type compounds. Individual layers can be described as sheets of corner-sharing MoO 4 tetrahedra and FeO 4Cl square pyramids. The temperature dependence of χ′ Mfor a powder sample exhibits a broad maximum at 104 K characteristic of extensive short range antiferromagnetic correlation within the layers. This is a result of surprisingly strong Fe(III) Fe(III) exchange interactions transmitted by O Mo O pathways. Long range three-dimensional order is confirmed by the hyperfine splitting of the zero field Mo¨ssbauer spectrum, T Ne´el = 69.2 ± 0.1K. Analysis of the combined quadrupole-Zeeman split hyperfine spectrum of the powder at 1.7 K leads to θ = 90° for the angle between the internal hyperfine field ( H hf) and V zz , the principal axis of the electric field gradient. Single crystal Mo¨ssbauer and X-ray powder diffraction data are also discussed.
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