Subsolidus Reactions in the System Fe₂O₃‐ TiO₂

Abstract

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).

Magnetic Dielectric Oxides: Subsolidus Phase Relations in the BaO:Fe2O3:TiO2System

“…Pseudobrookite, Fe 2 TiO 5 , is the only phase reported to a tetragonal unit cell ((44) PDF 39-810); however, to our knowledge no detailed structural study or other form in the TiO 2 -Fe 2 O 3 binary system (23,35,36). The crystal structure of pseudobrookite features Ti 4ϩ in octahe-reports of this phase have subsequently appeared in the literature.…”

Amorphous and Crystalline Titanium and Iron-Titanium Oxides in Synthetic Preparations, at Near Ambient Conditions, and in Soil Clays

“…Buddington and Linsley, 1964) and is only partially successful under hydrothermal conditions (Karkhanavala, 1959;Karkhanavala and Momin, 1959). Under dry conditions and high temperatures (e.g.…”

“…in chemical petrology). Karkhanavala and Momin (1959) hydrothermMly crystalized small amounts of pseudorutile at 300~ and 1200 psi and concluded that it was "not the product of atmospheric oxidation." These results are considered to be of little value in determining the conditions and type of Fe-Ti phase which will form during the alteration of titaniferous primary minerals under earth surface conditions.…”

“…The difficulty in synthesizing pseudorutile free of other Fe and Ti minerals (e.g. hematite and ilmenite) which coincide with some of its XRD lines, together with its poorly crystalline nature, have been major problems in characterizing this intermediate alteration product (Lynd, 1960;Karkhanavala and Momin, 1959;Grey and Reid, 1975). Little information is available on pedogeochemical conditions under which Fe and Ti may coprecipitate and crystallize from the weathering 190 Fitzpatrick,le Roux and Schwertmann Clays and Clay Minerals solution to form these mixed "alteration" products.…”

Thermodynamic assessment of the hollandite high‐level radioactive waste form

“…Hence, a Gibbs energy description of the rutile polymorph has been incorporated in the database (Table ). Intermediate stoichiometric phases for the BaO–TiO 2 , Cs 2 O–TiO 2 , FeO–TiO 2 , and Fe 2 O 3 –TiO 2 systems were included in the database. In addition, Amoroso et al observed the formation of the BaFe 12 O 19 and FeAl 2 O 4 phases.…”