Neutron Diffraction Study of Crystal and Magnetic Structure of Dy[Fe(CN)6].4D2O

We present an analysis of the powder neutron diffraction patterns taken from the Dy[Fe(CN)6].4D2O at room temperature and in the temperature range 1.6 - 40 K. The deuterium positions were localized by means of combination of direct and reciprocal space methods and crystal structure of the compound was refined using the Rietveld method. The knowledge of the complete crystal structure, including the deuterium atoms positions, enables further investigation of magnetic structure of these types of materials from the neutron diffraction experiments. The investigated phase was found to order magnetically bellow 2.8 K. The diffraction patterns taken at temperatures 1.76 K - 9.63 K show gradual development of magnetic moment as temperature decreases.