New phase with K2NiF4 structure in the LaLiFeO system |
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Authors: | F Abbattista M Vallino D Mazza A Delunas |
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Affiliation: | Dipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico di Torino, Torino, Italy;Gruppo Nazionale di Struttura della Materia Istituto di Fisica Superiore dell''Universita, Cagliari, Italy |
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Abstract: | The existence has been proved, for the first time, in the LaLiFeO system of the phase (La1.75Li.25) (Fe.5Li.5)O4?x with tetragonal symmetry (; ; ) and K2NiF4-type structure.This phase gives probably the first example of lithium distribution in both A and B sites of A2BO4-type mixed oxides. The high ratio suggests a strong elongation of FeO6 octahedra induced by a high spin Fe(IV) d4 configuration. The results of structural studies and of Mössbauer analysis, confirming the above conclusions, are reported. |
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