Abstract
Phase analysis studies of the homologous series Ga 4Ti m−4 O 2 m−2 by electron microscopy and diffraction reveals that m = 5 and 7 may occur but they are metastable, appearing only in incompletely reacted specimens. Thus m = 9 is the lowest stable member of the series. The observation of and structure determination of a new tetragonal tunnel structure, containing hollandite-type tunnels separated by elements of the β-gallia and rutile structure types, are also reported. The stoichiometry range M x Ga 10+2 x Ti 6−2 x O 27 ( M = Al 2O 2+; 0.80 < x < 1.20) is suggested for this phase, since Al 3+ is necessary to stabilize this phase. Lattice image studies of Ga 2TiO 5 reveal that it does not have the pseudobrookite structure, as assumed by previous authors, but instead adopts the “low-temperature” Ti 3O 5 structure type.
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