Regular ArticleCrystal Structures and Magnetic Properties of MV3O7 (M = Cd, Ca, Sr) with Square Pyramidal V(IV)
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2003, Journal of Solid State ChemistryCitation Excerpt :In such spin dimers, the two magnetic orbitals ψ interact to form bonding and antibonding levels (ψ+ and ψ−, respectively), and these levels are each singly occupied (Fig. 56b). There is only one unpaired spin per formula unit in α′-NaV2O5, and all vanadium atoms are equivalent [154,160]. Therefore, in the spin dimers representing two adjacent vanadium atoms of α′-NaV2O5, namely, (V2O9)9− (Fig. 55a and b) and (V2O8)7− (Fig. 55c), the ψ+ level is singly occupied and the ψ− level is empty so that one of these spin dimers should act as a spin monomer.
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