Abstract
The lattice parameter,a, increases with the increase of Ti4+ substitution while it decreases with the increase of Ge4+ substitution in Cu1+xAxFe2−2xO4 compounds [A=Ti4+, Ge4+Sn4+]. On substitution of Sn4+,a does not vary. CuFe2O4 exhibits single domain (SD) behaviour that changes to multi domain (MD) type on Ti4+ substitution. On Ge4+ substitution initially all the compositions exhibit SD behaviour while forx>0.2 they show MD behaviour. All Sn4+ substituted compositions exhibit SD behaviour. The Curie temperature decreases on addition of Ti4+, Sn4+ and Ge4+. The magnetic momentnB (77 K) initially increases and then decreases with the substitution of Ti4+, Ge4+, and Sn4+. This is explained by cation distribution and reduction of Fe3+ ions.
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