Moessbauer study of 60Co .GAMMA.-ray irradiated FexMg1-x(NH4)2(SO4)26H2O.
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概要
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The γ-ray radiolytic oxidation of Fe<SUP>2+</SUP> ions in Fe<I><SUB>x</SUB></I>Mg<SUB>1−<I>x</I></SUB>(NH<SUB>4</SUB>)<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>2</SUB>·6H<SUB>2</SUB>O (x=1.0, 0.75, 0.56, 0.35, and 0.075) is studied by Mössbauer spectroscopy. For <I>x</I>≤0.75, a part of Fe<SUP>2+</SUP> ions remain unoxidized even after heavy irradiation of <SUP>60</SUP>Co γ-rays in contrast to the complete disappearance of Fe<SUP>2+</SUP> ions for <I>x</I>=1.0. At least three kinds of Fe<SUP>3+</SUP> ions are produced, and two of them order magnetically at liquid He temperature. Their saturated relative amount after heavy irradiation depends on the concentration of Fe, and is well explained by the random distribution probability of Fe and Mg ions among the six neighboring metallic sites around the Fe<SUP>2+</SUP> ion.
- 公益社団法人 日本化学会の論文
著者
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SAKAI Fumiko
The Institute for Solid State Physics, The University of Tokyo
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SEKIZAWA Hisashi
The Institute of Physical and Chemical Research
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Sakai Nobuhiko
The Institute For Solid State Physics The University Of Tokyo
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Sekizawa Hisashi
The Institute Of Physic And Chemical Research
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- Moessbauer study of 60Co .GAMMA.-ray irradiated FexMg1-x(NH4)2(SO4)26H2O.