Modification of the ferrite phase in cements by manganese substitution

Synopsis The effect of manganese substitution into the crystal structure of the ferrite phase, Ca₂ (Fe_2-x Alx)O₅, has been studied by X-ray diffraction, analytical electron microscopy and differential thermal analysis. The introduction of manganese into Ca₂Fe2O5 and Ca₄Fe2Al2O10 produces a distortion of the crystal structure marked by an expansion of the b axis but without changes in crystallographic symmetry. The limits of solid solution of manganese in both phases were determined. The presence of manganese in the Ca₂Fe2O5_{}phase suppresses its ferromagnetic character.