Different sets of stacking vectors give non-congruent sets of interatomic distances which yield almost the same Patterson function and hence similar diffraction patterns.
first of these we present a new divalent Mn succinate framework, Mn(C 4 H 4 O 4), which undergoes several magnetic phase transitions at low temperature. This compound contains two well separated MnO 6 octahedral sheets with very different connectivity creating two significantly different and well seperated magnetic planes. Neutron powder diffraction has been used to examine the magnetic structure of these planes and this will be presented alongside the important role Mn 2+ plays in stabilising this unusual structure. The detailed structures of the transition metal gallates will also be explored. In this fascinating family Fe is found in the trivalent form while all other frameworks contain divalent cations. Despite this, however, initial single crystal structural studies did not indicate any significant differences in the structures of these materials. Here we present a subsequent, more precise, study of these compounds using neutron and synchrotron X-ray diffraction. The differences caused by the presence of di-and trivalent cations and the effect this has on the positions and occupancies of the hydrogens in this structure is described. We also explore the magnetic structure adopted, at low temperatures, by the one dimensional CoO 6 octahedral chains in Co gallate.
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