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Spherical magnetite particles with mean diameter of about 10 nm or less were prepared by means of a reduction–precipitation method with ferric chloride as starting material, which was partially reduced to ferrous salts by Na2SO3 before alkalinizing with ammonia. It was found that the nature of the product depends strongly on the initial ratio R0 = [Fe3+]0/[SO2−3]0. The most appropriate ratio was...
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