Development of resonant X-ray magnetic scattering method under high pressure and magnetic structural analysis of minerals

• Project/Area Number: 24740354
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: OKUBE Maki 東京工業大学, 応用セラミックス研究所, 助教 (10397060)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: Ｘ線共鳴磁気散乱 / マグネタイト / 磁気構造 / 陽イオン占有席 / X線共鳴磁気散乱 / 共鳴効果 / 磁性電子 / 放射光 / 共鳴散乱

Outline of Final Research Achievements

The experimental and theoretical development of the resonant X-ray magnetic scattering (RXMS) analysis was performed with the aim of applying it to crystallographic magnetic structural studies. Accurate estimation of the anomalous scattering factor f’ and the anomalous magnetic scattering factor fm” was carried out for magnetite to quantify resonant effect associated with different coordination environments of iron ions in crystals. By examining the energy dependence of the resonant magnetic peaks, the density of state of unpaired 3d electrons of iron was evaluated site-selectively. The energies of electrons in e and t2 orbitals of ions in A site as well as t2g and eg orbitals of ions in B site were obtained experimentally. The magnetic electron density distribution map was obtained using extended difference Fourier analysis.

Research Products

• [Journal Article] Site-specific electronic structures of ferrimagnetic Fe3O4 measured by resonant X-ray magnetic scattering (2014)
  • Author(s): Maki Okube and Satoshi Sasaki
  • Journal Title: Journal of Applied Crystallography Volume: 47 Issue: 4 Pages: 1387-1394
  • DOI: 10.1107/s1600576714013302
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 共鳴散乱と結晶構造解析 (2014)
  • Author(s): 奥部真樹、佐々木聡
  • Journal Title: 日本結晶学会誌 Volume: 56 Pages: 158-165
  • NAID: 130004552895
  • Peer Reviewed
• [Journal Article] Local structure of iron in tektites and natural glass: An insight through X-ray absorption fine structure spectroscopy (2013)
  • Author(s): Ling Wang, Akira Yoshiasa, Hiroshi Arima, Maki Okube, Tatsuya Hiratoko and Kazumasa Sugiyama
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 108(5) Issue: 4 Pages: 288-294
  • DOI: 10.1107/s0909049513009175
  • NAID: 10031203398
  • Peer Reviewed
• [Journal Article] Residual-density mapping and site-selective determination of anomalous scattering factors to examine the origin of Fe K pre-edge peak of magnetite (2012)
  • Author(s): M. Okube, T. Yasue and S. Sasaki
  • Journal Title: Journal of Synchrotron Radiation Volume: 19 Issue: 5 Pages: 759-767
  • DOI: 10.1107/s0909049512031147
  • Peer Reviewed
• [Presentation] X線共鳴磁気散乱を用いたFe3O4の電子密度分布解析 (2015)
  • Author(s): 奥部真樹・佐々木聡
  • Organizer: 第３回物構研サイエンスフェスタ
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2015-03-17 – 2015-03-18
• [Presentation] マグネタイトのFeK共鳴磁気散乱と電子密度分布 (2014)
  • Author(s): 奥部真樹・佐々木聡
  • Organizer: 平成26年度日本結晶学会年会
  • Place of Presentation: 東京大学
  • Year and Date: 2014-11-01 – 2014-11-03
• [Presentation] Distribution of mixed-valence ions in Mn1+xFe2-xO4 ferrites (2014)
  • Author(s): Yoshio Aoyagi, Maki Okube and Satoshi Sasaki
  • Organizer: 23rd Congress and general assembly of the International Union of Crystallography
  • Place of Presentation: Canada, Montreal
  • Year and Date: 2014-08-05 – 2014-08-12
• [Presentation] Site-specific RXMS study on the magnetic electron of magnetite (2014)
  • Author(s): Maki Okube and Satoshi Sasaki
  • Organizer: 23rd Congress and general assembly of the International Union of Crystallography
  • Place of Presentation: Canada, Montreal
  • Year and Date: 2014-08-05 – 2014-08-12
• [Presentation] Magnetic electron density in Fe3O4 examined by RXMS at Fe K edge (2014)
  • Author(s): Satoshi Sasaki, Maki Okube and Shunichi Takayasu
  • Organizer: 23rd Congress and general assembly of the International Union of Crystallography
  • Place of Presentation: Canada, Montreal
  • Year and Date: 2014-08-05 – 2014-08-12
• [Presentation] Ｘ線共鳴磁気散乱法による マグネタイトのフェリ磁性の研究 (2013)
  • Author(s): 奥部真樹 佐々木聡
  • Organizer: 平成25年度日本結晶学会年会
  • Place of Presentation: 熊本大学 黒髪南地区
• [Presentation] Energy-dependent study of resonant X-ray magnetic scattering to spin-resolve the ferrimagnetic structure of Fe3O4 (2013)
  • Author(s): Maki Okube and Satoshi Sasaki
  • Organizer: the 2013 Asian Crystallographic Association Meeting (AsCA'13)
  • Place of Presentation: 香港科技大学
• [Presentation] 共鳴散乱法を用いた異常散乱因子の席選択的決定 (2013)
  • Author(s): 奥部真樹、佐々木聡
  • Organizer: 物構研サイエンスフェスタ
  • Place of Presentation: つくば
• [Presentation] マグネタイトFe3O4の席選択的異常散乱因子の決定と電子分布 (2012)
  • Author(s): 奥部真樹、佐々木聡
  • Organizer: 日本結晶学会年会
  • Place of Presentation: 仙台
• [Presentation] Accurate Determination of Anomalous Scattering Factor near Fe K Absorption Edge (2012)
  • Author(s): Maki Okube and Satoshi Sasaki
  • Organizer: 11th International Conference on Synchrotron Radiation
  • Place of Presentation: フランス、リヨン