Tetrahedral-site copper in chalcogenide spinels

摘要: Abstract The ferromagnetism and metallic conductivity of the compounds Cu[Cr2]X4, where X = S, Se or Te, have been interpreted in terms collective “ d ” electrons on t2g symmetry from Cu2+ ions localized at Cr3+ ions. Lotgering van Stapele studied CuCrRhSe4, CuCrTiS4, M1−x Cu[Cr2]Se4, M Zn, Cd, Hg. They asserted that their results disprove this hypothesis strongly support existence Cr4+ presence Cu+ It is shown these assertions are incorrect.