ИСТИНА

Using two different methods core-shell and plum pudding structures of silica-coated hexaferrite particles were obtained. According to TEM core-shell particles are flattened spheres of silicon dioxide with hexaferrite particle inside (the larger diameter more than 100 nm); plum pudding structures are silica particles gel with randomly dispersed hexaferrite particles inside. According to magnetic measurements of dried powders, these composites consist of more than 80 weight percent of silica.