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- W2099690138 abstract "The structure of Ti4O7 was reexamined at 298, 140, and 115 K. The room-temperature and the 115 K structures are essentially as previously reported. Two new observations were made: a considerable cell-parameter change at the lower transition with a 0.3% increase in cell volume on cooling and the existence of a fivefold superstructure at 140 K only. The 140 K phase with cell parameters a = 6.918(1), b = 11.142(2), c = 15.127(3) α = 90.64(1), β = 92.79(1), γ = 91.45(1) in space group P 1 corresponds to long-range order of the Ti valences. It shows alternate Ti3+ and Ti4+ slabs parallel to (1 0 2) and a few valences with intermediate values at the contact between the slabs with the overall appearance of a modulated structure. Pairing of Ti3+ ions is observed. Similar to Ti6O11, expansion and contraction of the TiTi distances in the rutile-like chains is correlated with the electrostatic repulsion of the Ti ions so that the 3+ slabs are on the whole contracted along crutile while the 4+ slabs are expanded. The previous interpretation of the 140 K phase as a “liquid of bipolarons” should therefore be revised." @default.
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- W2099690138 date "1984-06-01" @default.
- W2099690138 modified "2023-09-24" @default.
- W2099690138 title "Structural chemistry of magnéli phases TinO2n−1 (4 ≤ n ≤ 9)" @default.
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- W2099690138 doi "https://doi.org/10.1016/0022-4596(84)90223-8" @default.
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