Mössbauer and structure data of Fe3H15(PO4)8·5H2O are discussed in detail. The small quadrupole interaction in this orthophosphate can be compared with a series of related compounds by use of a point charge model. The quadrupole splitting undergoes a relaxation collapse above 300 K. Below 27 K a ferrimagnetic ordering is found. It shows complicated temperature and external field dependences. The experimental data can be explained by a canted spin model for the A- and B-sublattices, where two unit cells of the crystal combine to a magnetic unit cell.
Source: Author links open overlay panelW. Meisel, J. Mintjens, W.P. Bosman