Magnesium oxide magnetic properties

Many oxides with the general formula XY2O4 crystallize with the same structure as the mineral spinel, magnesium aluminate. Certain groups of spinels show remarkable electrical, magnetic and cataljdic properties. The spinels may be s3Tithesized readily and their properties, which are composition-sensitive, may be controlled within varying limits (Verwey and Heilmann, 2). 

Specific fillers may be added to add or enhance specific properties in magnetic materials. Alumina, antimony trioxide or magnesium carbonate may be added to improve the flame retardant properties of the composite. The addition of lead oxide or carbide lead is suggested for improve resistance to nuclear radiation. To improve thermal conductivity, alumina, aluminium powder or silicates can be added. Silica, talc, mica or kaolin are indicated to increase the electrical resistance. The inclusion of metal powders, metal oxides or silicates are suggested to thermal absorption improvement. To increase the tensile strength in NR-based materials, carbon black in general, fibres or polymeric materials may be added. 

---