The literature on the subject points out that copper ferrite is one of the ferrites possible to be obtained from aqueous solutions at low pressures, that is, a mist precipitate of iron and copper hydroxides submitted to a crystallization treatment at ordinary temperatures and pressures (lower than 100<FONT FACE="Symbol">°</font> C and at approximately 1 atm pressure) will result in the form of crystalline copper ferrite. Using the HSC Chemistry for Windows 3.0 software, <FONT FACE="Symbol">e</font>H -pH diagrams for sufficiently large number of activities of Cu and Fe in the aqueous solutions, under condition of activity of copper=activity of iron, were constructed. From these diagrams, for a potentiometrically neutral aqueous solution, a pFe-pH diagram (where pFe=-log<FONT FACE="Symbol">a</font> Fe) has been constructed for each of the three selected temperatures (25, 150 and 300<FONT FACE="Symbol">°</font> C). Furthermore, the predictions of the obtained diagrams are in good agreement with the experimentally known facts.
cooper ferrite; magnetic ceramics; co-precipitation; hydrothermal synthesis
