Preparation of monodisperse peanut-type α-Fe2O3 particles from condensed ferric hydroxide gel

摘要: Recently, it has been found that monodisperse pseudocubic hematite particles 1.65 μm in mean edge length can be obtained large quantities of the order molality with a yield close to 100%, by adding 100 ml 5.4 N NaOH well-stirred 2.0 M FeCl3 and aging resulting condensed gel Fe(OH)3 for 8 days at 100°C. The method was provisionally referred as gel—sol method. As an application this technique, when 90 6.0 10 sulfate or phosphate solution were added instead NaOH, turned into peanut-type via ellipsoidal shape increasing concentration additives.