I hope the article that I send in the attachment will help you .

Thank you very much

Coprecipitation method can be the best one for synthesizing MgxCu1-xFe2O3. All you need is chosing the molar ratios of the used Mg and Cu cations. The reference given by Nadali is fine. Although I'm not sure that the authors got a mixture of CuFe2O3 and MgFe2O3 or one ferrite with both Mg and Cu in the same time. The given date are not enough to confirm.

Ta Dr Kooti but following the reference paper multi phases formed please help to solve issue

I had mentioned that if you use the given Ref. You might get mixture of two ferrites. If I were you, I would try combustion method but using metal nitrates instead of chlorides.It is not hard to do, just mix the three salts of the metals and heat the mix on a hot plate in a crusible. Do the reaction with some care because it will ignite during heating.

Thank you very much