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A series of solid solution xTiFe2O4.•E(1-x)Fe3O4 was synthesized by ceramic method over a whole range of the composition, 1• †_x• †_0. Changes of the Curie point, saturation moment and the lattice parameter with the composition were examined. Generalized titanomagnetite having some vacant site in the structure normally occupied in a spinel was also prepared by oxidizing the TiFe2O4-Fe3O4 solid solution series. The region within which the spinel structure can be in existence as a single phase was settled in a FeO-Fe2O3-TiO2 system. An equal lattice parameter line, equal Curie point line and equal saturation moment line for the generalized titanomagnetite were drawn on the FeO-Fe2O3-TiO2 system.

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