Core level photoemission spectroscopy and chemical bonding in Sr2Ta2O7

Publication: Research - peer-reviewJournal article – Annual report year: 2009

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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).
Original languageEnglish
JournalChemical Physics
Issue number1-3
Pages (from-to)74-78
StatePublished - 2009
CitationsWeb of Science® Times Cited: 25


  • Chemical bonding, XPS, Electronic structure, Superconducting materials for the energy sector
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ID: 3624761