Refinement of the critical V–V separation for spontaneous magnetism in oxides
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Cubic Liy[V2]O4 (0.7 ≤ y ≤ 2.0) samples with the [V2] O4 spinel framework have been prepared by room-temperature chemical delithiation–lithiation of Li[V2]O4. The Li+-ion distribution in the interstitial sites is distinguishable in different compositional regions: all-tetrahedral lithium in Li1−x[V2]O4 and in Li1+x[V2]O4 tetrahedral–octahedral pairs in association with tetrahedral lithium for 0 570 K. The extraction product Li1−xVO2 (0 ≤ x ≤ 0.3) has the low-temperature LiVO2 phase; Li0.3VO2 is nearly cubic with V displaced to the Li-deficient layers, a...