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Medientyp:
E-Artikel
Titel:
Evidence of a cubic iron sub-lattice in t-CuFe2O4 demonstrated by X-ray Absorption Fine Structure
Beteiligte:
Caddeo, Francesco;
Loche, Danilo;
Casula, Maria F.;
Corrias, Anna
Erschienen:
Springer Science and Business Media LLC, 2018
Erschienen in:Scientific Reports
Sprache:
Englisch
DOI:
10.1038/s41598-017-19045-8
ISSN:
2045-2322
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Copper ferrite, belonging to the wide and technologically relevant class of spinel ferrites, was grown in the form of t-CuFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanocrystals within a porous matrix of silica in the form of either an aerogel or a xerogel, and compared to a bulk sample. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed the presence of two different sub-lattices within the crystal structure of t-CuFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>, one <jats:italic>tetragonal</jats:italic> and one <jats:italic>cubic</jats:italic>, defined by the Cu<jats:sup>2+</jats:sup> and Fe<jats:sup>3+</jats:sup> ions respectively. Our investigation provides evidence that the Jahn-Teller distortion, which occurs on the Cu<jats:sup>2+</jats:sup> ions located in octahedral sites, does not affect the coordination geometry of the Fe<jats:sup>3+</jats:sup> ions, regardless of their location in octahedral or tetrahedral sites.</jats:p>