Electronic parameters of Sr2Nb2O7 and chemical bonding

被引：86
作者：
Atuchin, V. V. [1 ]
Grivel, J. -C. [2 ]
Korotkov, A. S. [1 ]
Zhang, Zhaoming [3 ]
机构：
[1] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
[2] Tech Univ Denmark, Mat Res Dept, Natl Lab Sustainable Energy, DK-4000 Roskilde, Denmark
[3] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2008年 / 181卷 / 06期
关键词：
X-ray photoelectron spectroscopy; Sr2Nb2O7; crystal structure; chemical bonding;
D O I：
10.1016/j.jssc.2008.01.046
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
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.
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页码：1285 / 1291
页数：7
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