Spinel-related magnesium-doped Li0.5Fe2.5O4 has been synthesised by heating
magnesium-substituted corundum-related alpha -Fe2O3 with Li2CO3 at 600 deg
reesC which is ca. 600 degreesC lower than the temperature normally used to
prepare metal-doped Li0.5Fe2.5O4 by conventional sintering methods. Rietve
ld structure refinement of the X-ray powder diffraction data shows that the
Mg2+ ions substitute for Fe3+ ions on the tetrahedral sites whilst the Li ions are located on the octahedral sites. The Fe-57 Mossbauer spectrum and
magnetic measurements are consistent with this structural model. (C) 2001
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