High energy heavy ion irradiation effects in MgO-MgFe2O4 ceramics

被引：0
|
作者：
Treilleux, M. [1 ]
Fuchs, G. [1 ]
Perez, A. [1 ]
Balanzat, E. [1 ]
Dural, J. [1 ]
机构：
[1] Univ Claude Bernard Lyon, France
来源：
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | 1988年 / B32卷 / 1-4期
关键词：
Ions - Magnesium Compounds - Radiation Damage - Microscopes; Electron; -; Applications; Spectroscopy; Mossbauer; Xenon;
D O I：
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学科分类号：
摘要：
Magnesium oxide single crystals containing magnesioferrite precipitates (MgFe2O4) have been obtained by thermal annealing at 1073 K of MgO single crystals implanted with 6×1016 100 keV 57Fe ions cm-2. The size of the aggregates ranges from 20 to 80 nm. These samples have been irradiated with 3.4 GeV Xe ions at 1012 ions cm-2 fluence, and effects have been investigated by transmission electron microscopy (TEM) and conversion electron Mossbauer spectroscopy (CEMS). TEM observations reveal damaged regions inside the precipitates. The CEMS spectra show an increase of the paramagnetic component due to Fe3+ ions on the cost of the magnetically ordered components due to Fe3+ ions in octahedral and tetrahedral sites of the MgFe2O4 spinel structure. This is in agreement with the TEM observations and can be due to a local modification of the spinel structure in the damaged regions. Such irradiation defects are tracks induced by the very high electronic stopping power of the Xe ions.
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页码：397 / 400
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