X-ray absorption spectroscopy of strongly disordered glasses: Local structure around Ag ions in gAg2OnB2O3

A. Kuzmin, G. Dalba, P. Fornasini, F. Rocca, and O. Šipr
Phys. Rev. B 73, 174110 – Published 11 May 2006

Abstract

The local structure around Ag ions in silver borate glasses gAg2OnB2O3 (n=2,4) was studied by x-ray absorption spectroscopy at the Ag K edge for temperatures from 77to450K. Extended x-ray absorption fine structure (EXAFS) analysis based on cumulant expansion or multishell Gaussian model fails for these systems. Therefore, the radial distribution functions (RDFs) around Ag ions were reconstructed using a method based on the direct inversion of the EXAFS expression. The RDFs consist of about eight atoms (oxygens and borons), exhibit a relatively weak temperature dependence, and indicate the presence of strong static disorder. Two main components can be identified in RDFs, located at about 2.32.4Å and 2.53.4Å, respectively. The chemical types of atoms contributing to the RDF were determined via a simulation of configurationally averaged x-ray absorption near-edge structure (XANES) and EXAFS signals. The immediate neighborhood of Ag contains mostly oxygens while borons dominate at larger distances. The combination of EXAFS and XANES techniques allowed us to determine a more complete structural model than would be possible by relying solely on either EXAFS or XANES alone.

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  • Received 30 September 2005

DOI:https://doi.org/10.1103/PhysRevB.73.174110

©2006 American Physical Society

Authors & Affiliations

A. Kuzmin*

  • Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia

G. Dalba and P. Fornasini

  • Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università di Trento, Via Sommarive 14, I-38050 Povo (Trento), Italy

F. Rocca

  • IFN-CNR, Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche, Sezione “ITC-CeFSA” di Trento, Via Sommarive 18, I-38050 Povo (Trento), Italy

O. Šipr

  • Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, CZ-162 53 Prague, Czech Republic

  • *Electronic address: a.kuzmin@cfi.lu.lv; URL: http//www.cfi.lu.lv

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Issue

Vol. 73, Iss. 17 — 1 May 2006

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