Validity of Valence Estimation of Dopants in Glasses using XANES Analysis.

ABSTRACT: X-ray absorption near edge structure (XANES) measurement is one of the most powerful tools for the evaluation of a cation valence state. XANES measurement is sometimes the only available technique for the evaluation of the valence state of a dopant cation, which often occurs in phosphor materials. The validity of the core excitation process should be examined as a basis for understanding the applicability of this technique. Here, we demonstrate the validity of valence estimation of tin in oxide glasses, using Sn K-edge and L-edge XANES spectra, and compare the results with ¹¹⁹Sn Mössbauer analysis. The results of Sn K-edge XANES spectra analysis reveal that this approach cannot evaluate the actual valence state. On the contrary, in L_II-edge absorption whose transition

SUBMITTER: Masai H 

PROVIDER: S-EPMC5764964 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature