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The structural and physical properties of the β polymorph of iron tungstate Fe 2 WO 6 have been investigated by synchrotron and neutron diffraction vs temperature, combined with magnetization and dielectric properties measurements. The monoclinic P 2 1 / a crystal structure of β-Fe 2 WO 6 has been determined and consists of an original network of zigzag chains of FeO 6 and WO 6 octahedra sharing trans and skew edges, connected through corners into a 3D structure. Magnetization measurements indicate an antiferromagnetic transition a T  N = 264 K, which corresponds to a ↑↑↓↓ nearly collinear ordering of iron moments inside sequences of four edge-sharing FeO 6 octahedra, as determined by neutron diffraction. A canting of the moments out of the ac plane is observed below 150 K, leading to a noncollinear antiferromagnetic structure, the P 2 1 / a ' magnetic space group remaining unchanged. These results are discussed in comparison with the crystal and magnetic structures of γ-Fe 2 WO 6 and with the magnetic couplings in other iron tungstates and trirutile Fe 2 TeO 6 .

Original Network of Zigzag Chains in the β Polymorph of Fe2WO6: Crystal Structure and Magnetic Ordering

Original Network of Zigzag Chains in the β Polymorph of Fe₂WO₆: Crystal Structure and Magnetic Ordering