کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1332812 979057 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electronic parameters of Sr2Nb2O7 and chemical bonding
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Electronic parameters of Sr2Nb2O7 and chemical bonding
چکیده انگلیسی

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, Δ(O–Nb)=BE(O 1s)–BE(Nb 3d5/2) and Δ(O–Sr)=BE(O 1s)–BE(Sr 3d5/2), 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 Δ(O–Nb) increases with increasing mean Nb–O bond distance, L(Nb–O). A new empirical relationship between Δ(O–Sr) and L(Sr–O) was also obtained. Interestingly, the correlation between Δ(O–Sr) and L(Sr–O) was found to differ from that between Δ(O–Nb) and L(Nb–O). Possible cause for the difference is discussed.

Layered crystal structure of Sr2Nb2O7.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 181, Issue 6, June 2008, Pages 1285–1291
نویسندگان
, , , ,