“…For both these compounds the Curie temperatures T C as well as the CurieWeiss temperatures θ CW are of the order of 500 K. On the base of these matrices four spinel families were obtained via substitution in the B-sites of the magnetic chromium ions by the nonmagnetic Sb or Al ions. Three of these families turned out to be stoichiometric: CuCr 2−x Sb x S 4 (x = 0.3, 0.4, 0.5) [1], CuCr 2−x Sb x Se 4 (x = 0.1, 0.2, 0.5, 0.8, 1.0) [2], CuCr 2−x Al x Se 4 (x = 0.1, 0.2, 0.3, 0.4, 0.5) whereas the fourth one, namely: Cu 1+x Cr 1.5+y Sb 0.5+z Se 4+t (where −0.02 ≤ x ≤ 0.01, 0.03 ≤ y ≤ 0.35, −0.2 ≤ z ≤ −0.02, 0.01 ≤ t ≤ 0.08) [3] occurred to be nonstoichiometric. All powder samples mentioned above were obtained by ceramic method.…”