Inverse spinel structure of Co-doped gahnite

Jasminka Popović; Emilija Tkalčec; Biserka Gržeta; Stanislav Kurajica; Boris Rakvin

doi:10.2138/am.2009.3173

Published by De Gruyter April 1, 2015

Inverse spinel structure of Co-doped gahnite

Jasminka Popović , Emilija Tkalčec , Biserka Gržeta , Stanislav Kurajica and Boris Rakvin

From the journal American Mineralogist

https://doi.org/10.2138/am.2009.3173

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Abstract

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 Fd3̄m. 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

Keywords : Co-doped gahnite; spinel structure; X-ray powder diffraction; Rietveld method

Received: 2008-12-16

Accepted: 2009-2-3

Published Online: 2015-4-1

Published in Print: 2009-5-1

Inverse spinel structure of Co-doped gahnite

Abstract

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