Journal article
Electronic parameters of Sr2Nb2O7 and chemical bonding
Russian Academy of Sciences1
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Australian Nuclear Science and Technology Organisation5
X-ray photoelectron spectroscopy (XPS) measurements were carried out on a strontium pyroniobate (Sr2Nb2O7) powder sample, which was synthesized using standard solid-state method. The binding energy (BE) differences between the O 1s and cation core levels, Delta(O-Nb) = BE(O 1s)-BE(Nb 3d(5/2)) and Delta(O-Sr) = BE(O 1s)-BE(Sr 3d(5/2)), were used to characterize the valence electron transfer on the formation of the Nb-O and Sr-O bonds.
The chemical bonding effects were considered on the basis of our XPS results for Sr2Nb2O7 and earlier published structural and XPS data for other Sr- or Nb-containing oxide compounds. The new data point for Sr2Nb2O7 is consistent with the previously derived relationship for a set of Nb5+ -niobates that Delta (O-Nb) increases with increasing mean Nb-O bond distance, L(Nb-O).
A new empirical relationship between Delta(O-Sr) and L(Sr-O) was also obtained. Interestingly, the correlation between Delta(O-Sr) and L(Sr-O) was found to differ from that between Delta(O-Nb) and L(Nb-O). Possible cause for the difference is discussed. (c) 2008 Elsevier Inc. All rights reserved.
| Language: | English |
|---|---|
| Year: | 2008 |
| Pages: | 1285-1291 |
| ISSN: | 1095726x and 00224596 |
| Types: | Journal article |
| DOI: | 10.1016/j.jssc.2008.01.046 |
| ORCIDs: | Grivel, Jean-Claude |
