摘要: 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 A and α= 55° 17′, whereas the γ-form, maghemite, structure which closely approximates to that defective inverse spinel1. In terms spinel structure, maghemite contains 2 cation vacancies per unit cell corresponding content is Fe21 III □2 O32, where □ signifies vacancy.
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