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The  57 Fe Mössbauer spectrum of the oxide La 2 Li 0.50 Cu 0.50 O 4  doped with  57 Fe (1 at.-%) underlines at 300 K the presence of three different components: two corresponding to the substitution of  57 Fe probe atoms for respectively “Cu 3+ ” [Fe(1)] and Li +  [Fe(3)] and the third [Fe(2)] attributed to  57 Fe associated with oxygen vacancies. A decrease of the temperature down to 77 K does not lead to essential changes of the Mössbauer parameters corresponding to the Fe(1) and Fe(2) sub-spectra. On the contrary, a drastic change occurs in the Fe(3) sub-spectrum which has been interpreted by a displacement of the charge-transfer equilibrium Fe 4+ (3) + O 2−  → Fe 3+ (3) + O(L̲) at the Li +  sites.

Local Environment and Electronic Structure in K 2 NiF 4 -type La 2 Li 0.50 Cu 0.50 O 4 Doped by 57 Fe