XAFS study of BIMEVOX ionic conductors for ME = Mg, Si, Zr, Zn

, , , , and

Published under licence by IOP Publishing Ltd
, , Citation A Twarog et al 2005 Phys. Scr. 2005 318 DOI 10.1238/Physica.Topical.115a00318

1402-4896/2005/T115/318

Abstract

BIMEVOX ceramics with different molar fraction of ME = Mg, Si, Zr, Zn have been investigated. X-ray absorption spectra have been measured for K edges of vanadium and zinc. The XANES at the vanadium K edge undergoes a conspicuous change for the metal dopant concentrations exceeding dopant solubility limits. Position of the pre-edge peak indicates the valence state of vanadium to be 5+ in all studied BIMEVOX'es. Vanadium coordination, as inferred from the EXAFS data, shows similarity for all dopants used, with two characteristic distances to oxygen atoms. An estimate of oxygen occupation numbers is given. Local environment of zinc atoms has an average coordination number ca. 4, and exhibits shorter interatomic distances to oxygen atoms than vanadium.

Export citation and abstract BibTeX RIS

Please wait… references are loading.
10.1238/Physica.Topical.115a00318