Abstract
FERRIC oxide may exist in either of two stable crystal modifications at room temperature. The α-form, hematite, has a rhombohedral lattice with a0= 5.4228 Å and α= 55° 17′, whereas the γ-form, maghemite, has a structure which closely approximates to that of a defective inverse spinel1. In terms of the inverse spinel structure, the maghemite lattice contains 2 cation vacancies per unit cell and the corresponding unit cell content is Fe21III □2 O32, where □ signifies a cation vacancy.
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RENSHAW, G., ROSCOE, C. Thermal Stability of γ-Ferric Oxide. Nature 224, 263–264 (1969). https://doi.org/10.1038/224263a0
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DOI: https://doi.org/10.1038/224263a0
