EXAFS spectroscopic study of PbO–Bi2O3–Ga2O3 glasses

XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers

“…The peak at ≈ 1.8Å dominates. It denotes the nearest neighbour Bi-O distance and its position stays in agreement with FT EXAFS spectra for other alloys and compounds [8][9][10]. The same peak, but with smaller amplitude, is clearly visible also for the [CoCiBi]×5 sample after decomposition of the FT EXAFS signal.…”

X-ray absorption fine structure study of amorphous metal oxide thin films prepared by photochemical metalorganic deposition

“…As a local probe, XAFS does not require long-range ordering in a material and, as such, is well-suited to the study of amorphous systems [47,48], a realm where diffraction methods are ineffectual. In the study of amorphous metal oxides, it has been applied to such systems as ZrO 2 [49], CrO 2 [50], MoO 3 [51], WO 3 [51,52], CeO 2 [53], and to multimetallic glasses such as BaTiO 3 [54], PbO-Bi 2 O 3--Ga 2 O 3 [55], and Zr x Ti 1À x O 2 [56]. Here we examine amorphous metal oxides of iron, chromium and mixed cobalt/iron (1:2 ratio) and compare to related crystalline species in order to set a foundation for the structure-property relationships in these oxides.…”

Site selective spectroscopy of Eu3+ in heavy-metal oxide glasses

“…This behavior, already observed in mixed fluorochloride glasses [17] can be understood on the basis of a decrease of the degree of covalency of the Eu-O bond produced by the progressive substitution of PbO by Bi 2 O 3 , since the formation of Bi polyhedra in the glass requires additional oxygens other than those provided by Bi 2 O 3 [18]. The further increase of S T at lower excitation energies could be related to the entrance of Bi 3+ near the first ligand coordination sphere giving rise to additional Eu-O distortions which increases the medium range crystal field parameters.…”