In order to further elucidate the local structure of vanadate glasses, x-ray photoelectron spectroscopy (XPS) and magnetization studies are reported on a series of SrO-vanadate and SrO-borovanadate glasses: [(SrO)x(V2O5)1-x], [(SrO)0.5-y(B2O3)y(V2O5)0.5], and [(SrO)0.2(B2O3)z(V2O5)0.8-z]. From the analysis of the XPS spectra for the Sr 3p, B 1s, V 2p, and O 1s core levels, several distinct concentration regimes are identified in terms of various structural units being present. Metavanadate chainlike structures of SrV2O6 and individual VO4 units occur in vanadate glasses with low SrO content x≤0.2 with VO5 polyhedra also appearing at higher SrO content. The SrV2O6 and VOn polyhedra predominate in the low B2O3 containing SrO-borovanadate glasses as the B substitutes into the V sites of the various VOn polyhedra and only when the B2O3 concentration exceeds the SrO content do BOn structures appear. This qualitative picture of three distinct structural groupings for the Sr-vanadate and Sr-borovanadate glasses is consistent with the proposed glass structure based on previous IR and extended x-ray absorption fine structure (EXAFS) studies on these types of vanadate glasses.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1 Sep 2005|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics