1:2 ratio of iron sulfate and iron (III) chloride are often used to prepare iron oxide nanoparticle. Some people are considering the same ratio of iron (II) and iron (III) chlorides. I need the reasons for this ratio level precursors.
Magnetite (the product) is Fe3O4 - this contains one Fe(II) and two Fe(III). So if you are a doing a co-precipitation, you should start with this ratio to get the correct product. If you use chloride you get different iron oxides and oxyhydrixide precursors than if you use sulfate. Iron oxide chemistry is complicated. Try and look at the Cornell and Schwertmann iron oxides book if you want to learn more about iron oxide formation and chemistry http://books.google.co.uk/books/about/The_Iron_Oxides.html?id=CCnNKzh4oKUC&redir_esc=y. Also, there are some good papers from others on partial oxidation and other methods of magnetite synthesis (e.g. Sugimoto and Majetic 1980). There are lots of references to further information in my thesis if you'd like more details on the chemistry of iron oxides. http://etheses.whiterose.ac.uk/3152/1/Thesis_JM_Galloway_2012.pdf I hope this helps.
It depends on the synthesis conditions and the end product that you want to get. If your aim is to prepare Fe3O4 (with two Fe3+ and one Fe2+ ions) and your synthesis conditions are such that oxidation or reduction of iron ions can be ignored then you should start with 1:2 ratio as you have mentioned above.
Magnetite (the product) is Fe3O4 - this contains one Fe(II) and two Fe(III). So if you are a doing a co-precipitation, you should start with this ratio to get the correct product. If you use chloride you get different iron oxides and oxyhydrixide precursors than if you use sulfate. Iron oxide chemistry is complicated. Try and look at the Cornell and Schwertmann iron oxides book if you want to learn more about iron oxide formation and chemistry http://books.google.co.uk/books/about/The_Iron_Oxides.html?id=CCnNKzh4oKUC&redir_esc=y. Also, there are some good papers from others on partial oxidation and other methods of magnetite synthesis (e.g. Sugimoto and Majetic 1980). There are lots of references to further information in my thesis if you'd like more details on the chemistry of iron oxides. http://etheses.whiterose.ac.uk/3152/1/Thesis_JM_Galloway_2012.pdf I hope this helps.
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