NEAR-EDGE STRUCTURE OF OXYGEN IN INORGANIC OXIDES: EFFECT OF LOCAL GEOMETRY AND CATION TYPE

被引：11

作者：

Brown, G. E., Jr. ^{[1
,2
]}

Waychunas, G. A. ^{[1
,2
]}

Stohr, J. ^{[3
]}

Sette, F. ^{[4
]}

机构：

[1] Stanford Univ, Sch Earth Sci, Stanford, CA 94305 USA

[2] Stanford Univ, Ctr Mat Res, Stanford, CA 94305 USA

[3] IBM Almaden Res Ctr, San Jose, CA 95120 USA

[4] AT&T Bell Labs, Murray Hill, NJ 07974 USA

来源：

JOURNAL DE PHYSIQUE | 1986年 / 47卷 / C-8期

关键词：

D O I：

10.1051/jphyscol:19868129

中图分类号：

学科分类号：

摘要：

NEXAFS measurements at the oxygen K-edge have been carried out on a variety of crystalline oxide samples to examine the effects of differences in local coordination environment of oxygen on near-edge structure. All spectra display an intense white line at about 543 eV and a strong shape resonance about 20 eV above the edge. The white line shifts to higher energies with increasing oxygen coordination number, although differences in nearest-neighbor type can affect this correlation. In addition, the Ca and transition-metal containing oxides display features 6-10 eV below and 6-9 eV above the white line. The intensities of these features vary inversely with the number of 3d-electrons but their energies are independent of cation oxidation state. Large changes in coordination number and geometry affect edge structure less than variations in types of nearest-neighbor cations. The inverse distance-energy relationship is poorly obeyed in these compounds when oxygen-cation bond lengths are compared with the position of the strongest shape resonance for a given structure type. The near-edge structure is qualitatively interpreted using the results of recent X alpha multiple scattered-wave calculations.

引用

页码：163 / 167

页数：5

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