Affinement de la structure des formes ordonnée et désordonnée de l'octaoxopentaferrate de lithium, LiFe5O8

Electrical and magnetic properties of magnesium-substituted lithium ferrite

“…The a-phase has an FCC inverse spinel structure with space group of P4 3 32 and aphase is an ordered phase in which the Li + and Fe 3+ ions are ordered in the 1:3 ratio in the octahedral B sites of the cubic spinel structure, whereas the remaining Fe 3+ ions occupy the tetrahedral A sites. Whereas the b-phase is a disordered phase where the Li + and Fe 3+ ions are randomly distributed in the octahedral interstices and the space group is Fd3m [11][12][13]. Fig.…”

Crystal and Magnetic Structure of the System Li0.5+0.5xFe2.5−1.5xTixO4 (x=0.16, 0.44, and 0.72)

“…These compositions are intermediate between the limits of substitution, Li 0.5 Fe 2.5 O 4 (x = 0) and LiFeTiO 4 (x = 1), previously described in the literature. [7,14] The main structural difference between these phases is the transition from the space group P4 3 32 to Fd3m, respectively.…”

Synchrotron X-ray powder diffraction studies on the order–disorder phase transition in lithium ferrites

“…The lattice of LiFe 5 O 8 is disordered, though not completely random, at temperatures above 1000 K, and may be quenched in air down to room temperature, displaying spinel Fd3m structure, with Fe 3+ at tetrahedral (8a) Wyckoff's positions, and a 1:3 mixture of Li + and Fe 3+ ions at octahedral (16d) positions. Below 1000 K, the structure becomes 'ordered', and can be described by the cubic space group P4 3 32 or its enantiomorph P4 1 32, with Fe 3+ in tetrahedral (8c) and octahedral (12d) sites, whereas Li + ions occupy the (4b) octahedral positions [6,7]. Relations between the Fd3m and P4 3 32 Wyckoff's positions are as follows [6]:…”

“…Below 1000 K, the structure becomes 'ordered', and can be described by the cubic space group P4 3 32 or its enantiomorph P4 1 32, with Fe 3+ in tetrahedral (8c) and octahedral (12d) sites, whereas Li + ions occupy the (4b) octahedral positions [6,7]. Relations between the Fd3m and P4 3 32 Wyckoff's positions are as follows [6]:…”