Effect of heat-treatment on magnetic properties and morphology of iron particles (2)

Abstract Marked inhibition effect of surface coated silica on the crystal of hematite particles in the process of heat-treatment of goethite particles was reduced by the addition of calcium hydroxide to the silica-coat on the surface of goethite particles. Coercivity of iron particles, prepared by reduction of the hematite particles, significantly decreased with increase in crystallite size of iron particles.