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Inverse spinel structure of Co-doped gahnite

Jasminka Popovi^1,*, Emilija Tkalec², Biserka Greta¹, Stanislav Kurajica² and Boris Rakvin³

¹ Division of Materials Physics, Ruer Bokovi Institute, P.O. Box 180, HR-10002 Zagreb, Croatia
² Faculty of Chemical Engineering and Technology, University of Zagreb, Maruliev trg 19, HR-10000 Zagreb, Croatia
³ Division of Physical Chemistry, Ruer Bokovi Institute, P.O. Box 180, HR-10002 Zagreb, Croatia

Correspondence: ^* E-mail: jpopovic{at}irb.hr

Powder ZnAl₂O₄ (gahnite) samples doped with 0–100 at% Co were obtained by a sol-gel technique. X-ray powder diffraction was used to characterize the samples. Gahnite samples are cubic with the normal spinel structure, space group Fdm. Cobalt doping caused a nonuniform increase of unit-cell parameter. The structure of the gahnite samples was refined by the Rietveld method. The location of Co²⁺ was determined by EPR spectroscopy. Cobalt doping of gahnite induces the inverse spinel structure at only 4 at% Co, and the inversion parameter increases with Co²⁺ doping level. Metal-oxide distances in the (Al,Co)O₆ octahedra dominantly influence the unit-cell parameter of Co-doped gahnite.

Key Words: Co-doped gahnite • spinel structure • X-ray powder diffraction • Rietveld method