MICROANALYSIS OF IRON OXIDATION-STATES IN EARTH AND PLANETARY MATERIALS

被引：8

作者：

BAJT, S

SUTTON, SR

DELANEY, JS

机构：

[1] UNIV CHICAGO, DEPT GEOPHYS SCI, CHICAGO, IL 60637 USA

[2] UNIV CHICAGO, CTR ADV RADIAT SOURCES, CHICAGO, IL 60637 USA

[3] RUTGERS STATE UNIV, NEW BRUNSWICK, NJ 08903 USA

来源：

PHYSICA B | 1995年 / 208卷 / 1-4期

基金：

美国国家航空航天局;

关键词：

D O I：

10.1016/0921-4526(94)00670-Q

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Initial studies have been made on quantifying Fe oxidation states in different iron-bearing minerals using K-edge XANES. The energy of a weak pre-edge peak in the XANES spectrum due to 1s-3d electron transition was used to quantify ferric/ferrous ratios with microprobe spatial resolution. The estimated accuracy of the technique was +/- 10% in terms of Fe3+/(Fe2+ + Fe3+). The detection limit was similar to 100 ppm with a synchrotron beam of similar to 100 mu m in diameter. The pre-edge peak energy in well-characterized samples with known Fe oxidation states was found to be a linear function of the ferric/ferrous ratio. The technique was applied to altered magnetites (ideally Fe3O4), and various silicates and oxides from meteorites.

引用

页码：243 / 244

页数：2