Modification of the ferrite phase in cements by manganese substitution

Abstract

The effect of manganese substitution into the crystal structure of the ferrite phase, Ca//2(Fe//2// minus //xAl//x)O//5, has been studied by X-ray diffraction, analytical electron microscopy and differential thermal analysis. The introduction of manganese into Ca//2Fe//2O//5 and Ca//4Fe//2Al//2O//1//0 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 Ca//2Fe//2O//5 phase suppresses its ferromagnetic character.Peer reviewe