Aleena Haqqi
Yes, you can synthesize but storing them will be a problem. ln inert conditions, they retain their magnetic properties but exposure to air renders them oxidized. Use some inert solvent for storage till their application part is over.
Dear Aleena
As you know manetite is a mixture of iron oxides in two and three oxidation states. While you are synthesizing it there is high possibility of oxidation of ferrous iron into ferric in the alkaline solution and in the presence of air.Therefore, you might get Fe2O3 in addition to Fe3O4, the required product.
Good luck
Aarif Shah thank you for responding, I would really appreciate if you can guide me in detail. What if I dry them soon after their synthesis would they still oxidize?
Mohammad Kooti Thank you for responding, is there any way of preparing only magnetite or separating both the particles ?
It is not easy to separate Fe2O3 from Fe3O4. You can try doing the preparation under normal condition but separate the magnetite as soon as you can from the solution. Oxidation of the dry magnetite is negligible.
Aleena Haqqi
They would oxidize whenever they get exposed to air. We observe that our calcinated samples lost magnetism when taken for VSM. So, storage should be properly taken care of.
Dear Arif
Magnetite is a mineral that occurs naturally on Earth. How can it exist naturally if is oxidized easily. Of course, the sample we make in the lab is more active than bulk because of its nano nature. However, I think if it is washed thoroughly, to get read of the alkaline residue and dry properly its oxidation can be somehow prevented.
Thanks for your comments.
Mohammad Kooti
Sir, I was commenting about Fe2O3. They lost magnetism due to oxidation
Dear Arif
You are right, if magnetite is oxidized to Fe2O3, hematite form, it will become antiferromagnetic.
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