ELECTRON-BEAM-INDUCED REDUCTION OF MN4+ IN MANGANESE OXIDES AS REVEALED BY PARALLEL EELS

被引：51

作者：

GARVIE, LAJ ^{[1
]}

CRAVEN, AJ ^{[1
]}

机构：

[1] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND

来源：

ULTRAMICROSCOPY | 1994年 / 54卷 / 01期

关键词：

D O I：

10.1016/0304-3991(94)90094-9

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

Chemical reduction of Mn4+ in the mineral asbolan was examined using parallel electron energy-loss spectroscopy (PEELS). Changes in the oxidation state of the manganese were monitored by recording the electron energy-loss near-edge structure (ELNES) for the Mn M(2,3-) and L(2,3-)edges. The edges in the undamaged material were consistent with Mn4+. Electron beam irradiation of the mineral caused the ionisation edges to change in shape and energy consistent with the decrease in the proportion of the Mn4+ and the increase in the proportions of Mn3+ and Mn2+. The final edge is very similar in energy and shape to that of Mn2+ in rhodochrosite (MnCO3) and manganosite (MnO) and the differences in shape can be accounted for by the presence of a small amount of residual Mn3+.

引用

页码：83 / 92

页数：10

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