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The spin–spin exchange parameters of α′-NaV2O5, CaV2O5 and MgV2O5 were examined by calculating the spin–spin interaction energies of their spin dimers, and the probable pairing distortion leading to the (2a×2b×4c) superstructure of α′-NaV2O5 was investigated by performing Madelung energy and bond valence sum analyses. In the V2O5 layers of α′-NaV2O5, CaV2O5 and MgV2O5, ladder chains of vanadium atoms...
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