Magnetic properties of titanomagnetites containing spinel (MgAl2O4).

Magnetic properties of titanomagnetites containing spinel have been studied. Variations of magnetization at room temperature and Curie point have been measured as a function of α, the mole fraction of ulvospinal in titanomagnetite series, and β, the mole fraction of spinel. Magnetization at 20°C and Curie point decrease with increasing α and β. Curie point and lattice constant vary in a systematic manner, so that measurements of these two parameters uniquely determine α and β in this system if the specimen is not oxidized. The effect of spinel content on the Curie points and lattice constants of titanomagnetite can be expressed as a linear superposition of the individual effects of Mg and Al with a ratio of 1:2.