The Electron Spin Resonance of the Mn<SUP>2+</SUP> Ion on the Surface of Magnesium Oxide

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概要

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• The behavior of the Mn<SUP>2+</SUP> ion on the surface of MgO was studied by using the ESR technique. The powder of MgO, the surface of which was doped with the Mn<SUP>2+</SUP> ion, was calcined at different temperatures from 100 to 1000°C in a vacuum, and then the ESR spectra were observed at room temperature. It was noticed that the spectral intensity showed a minimum at about 500°C, that the zero-field splitting parameter, <I>D</I>, increased with the temperature, and that the hyperfine coupling constant, <I>A</I>, decreased enormously at about 700°C. The environments around the Mn<SUP>2+</SUP> ion on the surface of MgO were discussed on the basis of these results. When H<SUB>2</SUB>, CO, or O<SUB>2</SUB> was added after the calcination, the <I>D</I> and <I>A</I> values changed in the temperature range above 500°C. Especially when O<SUB>2</SUB> was introduced, the <I>D</I> value fell to zero upon treatment at 1000°C. The crystal field around the Mn<SUP>2+</SUP> ion and the bonding between the Mn<SUP>2+</SUP> ion and its environments were discussed by taking into account the results of the magnetic-susceptibility measurements of the manganese ion on MgO.

• 公益社団法人 日本化学会の論文

著者

• Hasegawa Akinori

  Department Of Chemistry Kogakkanuniversity

• Yamada Yoshio

  Department Of Agricultural Chemistry Faculty Of Agriculture

• Miura Masaji

  Department of Chemistry, Faculty of Science, Hiroshima University

• Yamada Yoshio

  Department of Chemistry, Faculty of Science, Hiroshima University

• Yamamura Takemi

  Department of Chemistry, Faculty of Science, Hiroshima University

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