The polymorphism of the oxide Ti3O5 / H. Iwasaki, N.F.H. Bright and J.F. Rowland, Mineral Sciences Division. : M38-8/82E-PDF

"The oxide Ti3O5 has been prepared by reduction of TiO2 (as anatase and as rutile) using Ti metal as reductant and vacuum sintering, or by using CO or H2 as reductant. The oxides produced, and also their oxidation products at 650°C, were examined by X-ray diffraction. Three forms of Ti3O5 were characterized: (a) a form designated as D-type, produced by the hydrogen reduction of anatase, which yielded rutile only on oxidation; (b) a form designated as D-type, produced by the hydrogen reduction of rutile, which had an apparently similar X-ray diffraction pattern to that of the D-type, but which yielded a mixture of anatase and rutile on oxidation; (c) a form designated as M-type, produced by the vacuum-sintering of TiO2 with Ti metal, which had a different X-ray diffraction pattern but which also yielded a mixture of anatase and rutile on oxidation"--Summary, p. 99.

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