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- W2039021844 abstract "Abstract Reduction of the titanium-niobium oxides follows a common pattern. TiO2 is eliminated, to form a new phase richer in titanium than the original compound, and Nb(iv) replaces Ti(iv) in the original block structure, which is thereby enriched in niobium. With TiNb2O7, the second phase is a TiO2NbO2 solid solution, with the rutile structure, initially with a high titanium content, in equilibrium with a solid solution of composition Me3O7, isostructural with TiNb2O7. At log pO2 (atm) about −9.0 this reaches the limiting composition Ti0.72Nb2.28O7, in equilibrium with Ti0.56Nb0.44O2. The Me3O7 block structure then transforms into the Me12O29 block structure (Ti2Nb10O29Nb12O29 solid solution), which rapidly increases in niobium content as reduction continues. Reduction of Ti2Nb10O29 at oxygen fugacities above log pO2 (atm) = −9.0 forms the Me3O7 phase as the titanium-rich phase. At log pO2 = −9.0, and a composition about Ti1.6Nb10.4O29, the rutile solid solution takes over as second phase. The niobium/titanium ratio in both phases rises as reduction proceeds, and the last vestiges of the Me12O29 phase, in equilibrium with the final product, Ti0.17Nb0.67O2, are almost denuded of titanium." @default.
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- W2039021844 date "1981-11-01" @default.
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- W2039021844 title "Reduction of the titanium niobium oxides. I. TiNb2O7 and Ti2Nb10O29" @default.
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- W2039021844 doi "https://doi.org/10.1016/0022-4596(81)90373-x" @default.
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