A Neutron Diffraction Study of the Structure of Iron Phosphate Glasses
Iron phosphate (Fe2O3-P2O5) glasses with a high Fe2O3 content are particularly interesting in that they exhibit short range antiferromagnetic (speromagnetic) ordering at low temperatures. Neutron diffraction techniques have been employed to investigate the atomic structure of iron phosphate glasses, as a function of composition between 30 and 44 mol% Fe2O3, and the data are compared with two structural models in which the Fe atoms are either tetrahedrally or 6-fold coordinated by oxygen. It is concluded that the structure is much more complicated than either of these models would suggest and that it includes Fe3+ ions in both tetrahedral and octahedral coordination. Fe2+ ions are also present in octahedral, and possibly 5-fold, coordination.
A. C. Wright et al., "A Neutron Diffraction Study of the Structure of Iron Phosphate Glasses," Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B, vol. 49, no. 1, pp. 1-7, Society of Glass Technology, Feb 2008.
Materials Science and Engineering
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