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A study has been made of the binary system FenOt-TiO,, by solid-state reactions under dry and hydrothermal conditions. Under dry conditions only one binary compound, pseudobrookite (FeZOa-TiOz), was formed and no evidence of solid solution on either side of this compound at temperatures up to 1200OC. was obtained.The system under these conditions is a simple binary with a single binary compound. Under hydrothermal conditions of 300OC. and 1200 Ib. per sq. in. the system is apparently also binary, with a single unstable compound closely r e sembling, if not identical with, the naturally occurring mineral arizonite (ferric metatitanate, Fez(Ti0da).

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