Magnetic Structure of CsPd₂F₅

Abstract

Abstract The structure of CsPd 2 F 5 has been confirmed from neutron diffraction data on powdered sample. CsPd 2 F 5 crystallizes in the orthorhombic Imma space group. At 100 K, the unit‐cell constants are a = 6.473(2) Å, b = 7.853(5) Å, c = 10.718(3) Å and the calculation carried out using the Rietveld method leads to R 1 = 0.020. The network is formed of PdF 6 octahedra chains containing half of Pd in high‐spin configuration, connected one to each other by square planes containing the other half of Pd in low‐spin configuration. CsPd 2 F 5 orders antiferromagnetically below T N = 38 K. In the ordered state a weak ferromagnetic component occurs (σ 0 = 0.098 μ B at 2 K). The magnetic structure determined at 4 K is consistent with the magnetization data and can be described in the Im′m′a′ magnetic group without any doubling of the unit‐cell parameters. Within the chains, Pd 2+ are coupled antiparallel. The magnetic moments are located in the (x0z) plane, the angle between the moments and the z axis being 18°.