SILICON-IRON MIXED OXIDE POWDER

摘要

Silicon-iron mixed oxide powder having magnetic properties in the form of aggregated primary particles, a) for which TEM images show the presence of primary particles composed of spatially separate regions of silicon dioxide and iron oxide and the mean particle diameter of the iron oxide is 2 to 100 nm and b) in which the proportion of silicon, calculated as SiO2, is 5 to 65% by weight iron, calculated as Fe2O3, is 30 to 90% by weight and the proportion of silicon and iron, each calculated as abovementioned oxides, is at least 95% by weight c) in which the proportion of chloride is 0.2 to 3% by weight.