2002 Fiscal Year Final Research Report Summary
Study on local electronic states of transition metal atoms occupied the centers of octahedral and tetrahedral structures by ATS scattering
| Project/Area Number |
12640323
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
ISHIDA Kohtaro Tokyo University of Science, Faculty of Science and Technology Professor, 理工学部, 教授 (30012404)
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| Co-Investigator(Kenkyū-buntansha) |
KOKUBUN Jun Tokyo University of Science, Faculty of Science and Technology Researcher, 理工学部, 助手 (90318204)
KATOH Hiroyuki Tokyo University of Science, Faculty of Science and Technology Researcher, 理工学部, 助手 (80084482)
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| Project Period (FY) |
2000 – 2002
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| Keywords | ATS Scattering / X-ray Magnetic Scattering / Dipole transition / Quadrupole transition] / Hematite / Eskolaite / X-ray Resonant Scattering |
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| Research Abstract |
In 2002, we studied on Hematite (Fe_2O_3) and Eskolaite (Cr_O_3), which belong to the same crystal structure, corundum structure. We measured ATS scattering from these crystals near the K-absorption edge of Fe or Cr, using synchrotron beams in Photon Factory in Tukuba. The main results are the following
1) Just below the edges, (003) and (009) ATS intensities were observed in both crystals
2) The azimuthal dependence of the ATS peaks from Hematite showed three-hold symmetry
3) On the other hand, six-hold symmetry was observed in Eskolatie
4) From the azimuthal dependence, we conclude that the ATS scattering is caused by interference of quadrupole-quadrupole and dipole-quadrupole transitions in Hematite
5) In Eskolaite, the ATS scattering is due to quadrupole-quadrupole transition
6) In Hematite, two-hold azimuthal dependence of the ATS intensity was observed far from the edge
7) But, in Eskolaite, we did not observe such non-resonant ATS scattering
8) We conclude these non-resonant ATS scattering is due to the magnetic scattering and the difference in Hematite and Eskolaite caused by their magnetic structure
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Research Products
(6 results)
