Magnetic symmetry of vivianite Fe3(PO4).8H2O
Abstract
<h2>Acta Crystallographica</h2><h3></h3><h3>0365-110X</h3> <h2>research papers</h2> Volume 23 Part 6 Pages 935-937 December 1967 <h2>Magnetic symmetry of vivianite Fe 3 (PO 4 ).8H 2 O</h2> W. van der Lugt Acta Cryst. (1967). 23, 935 Magnetic Symmetry of Vivianite Fe3(PO4)2.8H20 BY W. VAN DER LUGT Solid State Physics Laboratory, University of Groningen, The Netherlands (Received 29 March 1967) Possible magnetic space groups for antiferromagnetic vivianite, Fe3(PO4)2.8H20, are derived on the basis of nuclear magnetic resonance measurements. The allowed space groups are PA21/c and Cc2/c. The spin configurations corresponding to these space groups are discussed. In 1961, possible magnetic space groups for antiferro- magnetic vivianite, Fe3(PO4)z. 8HEO, were derived by the author on the basis of nuclear magnetic resonance data of the protons and phosphorus nuclei (van der Lugt & Poulis, 1961). The actual derivation was pub- lished in Dutch (van der Lugt, 1961) and is not readily 936 MAGNETIC SYMMETRY OF VIVIANITE, Fe3(PO4)2.8H20 accessible. Because recent publications (Forstat, Love & McElearney, 1965; S61yom, 1966) show renewed interest in the rather strange magnetic properties of this material, a brief communication concerning the magnetic symmetry seems to be justified, more partic- ularly because we believe that sometimes not all avail- able information concerning