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• W2950242175 abstract "The system Li-V-N was studied by means of X-ray and neutron powder diffraction, thermal and chemical analyses, and XAS spectroscopy at the vanadium K-edge. Three polymorphs of Li(7)[VN(4)] have been established from X-ray and neutron powder diffraction (gamma-Li(7)[VN(4)], space group Pfourmacr;3n, No. 218, a = 960.90(4) pm, V = 887.23(6) x 10(6) pm(3), Z = 8; beta-Li(7)[VN(4)], space group Pathremacr;, No. 205, a = 959.48(3) pm, V = 883.31(5) x 10(6) pm(3), Z = 8; alpha-Li(7)[VN(4)], P4(2)/nmc, No. 137, a = 675.90(2) pm, c = 488.34(2) pm, V = 223.09(1) x 10(6) pm(3), Z = 2). Crystallographic and phase relations are discussed. All three modifications are diamagnetic, indicating vanadium in the oxidation state +5. The V-K XAS spectra support the oxidation state assignment, the non-centrosymmetric coordination (tetrahedral), and the nearly identical second coordination sphere of vanadium, made up from Li in all three phases. The 3d-related features of the spectra display strongly localized properties. The phase transitions appear to be reconstructive; no direct group-subgroup symmetry relations of the crystal structures exist. The formation of solid solutions between Li(2)O and beta-Li(7)[VN(4)] with the general formula Li(1.75)((V(0.25(1)(-)(x))Li(0.25)(x))(N(1)(-)(x)O(x)())) with 0 <or= x <or= 1 leads to increasing substitution of V by Li. At the approximate composition with x = 0.125 the Li-V-disorder seems to be complete: X-ray diffraction lines give rise to only one-half of the original unit cell dimensions, a' = 476.47(3) pm approximately (1/2)a(beta-Li(7)[VN(4)])." @default.
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• W2950242175 date "2003-03-26" @default.
• W2950242175 modified "2023-09-26" @default.
• W2950242175 title "Polymorphism of Heptalithium Nitridovanadate(V) Li₇[VN₄]" @default.
• W2950242175 cites W1511168241 @default.
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• W2950242175 doi "https://doi.org/10.1021/ic020653b" @default.
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