Journal article
Core level photoemission spectroscopy and chemical bonding in Sr2Ta2O7
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Electronic parameters of constituent element core levels of strontium pyrotantalate (Sr2Ta2O7) were measured with X-ray photoelectron spectroscopy (XPS). The Sr2Ta2O7 powder sample was synthesized using standard solid state method. The valence electron transfer on the formation of the Sr-O and Ta-O bonds was characterized by the binding energy differences between the O 1s and cation core levels, Delta(O-Sr) = BE(O 1s) - BE(Sr 3d(5/2)) and Delta(O-Ta) = BE(O 1s) - BE(Ta 4f(7/2)).
The chemical bonding effects were considered on the basis of our XPS results for Sr2Ta2O7 and earlier published structural and XPS data for other Sr- and Ta-containing oxide compounds. The new data point for Sr2Ta2O7 is consistent with the previously derived relationship for a set of Sr-bearing oxides.
The binding energy difference Delta(O-Sr) was found to decrease with increasing bond distance L(Sr-O).
| Language: | English |
|---|---|
| Year: | 2009 |
| Pages: | 74-78 |
| ISSN: | 18734421 and 03010104 |
| Types: | Journal article |
| DOI: | 10.1016/j.chemphys.2009.04.010 |
| ORCIDs: | Grivel, Jean-Claude |
