2007 Fiscal Year Final Research Report Summary
Charge order in the mixed valence oxide Fe_2BO_4
| Project/Area Number |
18540356
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Teikyo University |
|---|
Principal Investigator |
NAKAMURA Shin-ichi Teikyo University, Science and Engineering, Lecturer (80217851)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
IKEDA Naoshi Okayama Universty, Science, Professor (00222894)
SHIMOMURA Susumu Keio University, Science and Engineering, Lecturer (00260216)
OKAWA Kenichi Japan Atomic Energy Agency, J-PARK Center, Researcher (80391332)
MORI Shigeo Osaka Prefecture University, Physical science, Professor (20251613)
|
|---|
| Project Period (FY) |
2006 – 2007
|
| Keywords | mixed valence oxide / Mossbauer Spectroscopy / synchrotron X ray diffraction / neutron diffraction / electron diffraction / charge order |
|---|
| Research Abstract |
We have investigated the crystal structure and the charge order of mixed valence oxide Fe_2BO_4 by synchrotron X ray diffraction, neutron diffraction, ele diffraction, and Mossbauer spectroscopy. Our results are summarized as follows ;
1)Preparation of the specimens : Polycrystalline, polycrystalline containing "B isotope, and single crystal were prepared.
2)Evaluation of the charge order and magnetic structure by Mossbauer spectroscopy : By the quadrupole effect, we examined the reported charge order patten concluded that the pattern or the structure parameters might be wrong. We also examined the magnetic structure by applying external magnetic field a temperatures, and found that the magnetic structure is parasitic one (canted or spiral).
3) Diffraction measurements using polycrystalline : In the synchrotron X ray diffraction, we could not fined superstructure reflections corresponding to the dot of the unit cell along the a-axis. We found, however, an anomalous temperature dependence of the lattice parameters around the transition temperature. C other hand in neutron diffraction, we found some weak superstructure reflections. Assuming a tentative space group, we could see a difference in bond valenci of Fe-O in each Fe site, which may be indicative of a charge order. We also found that the B parameters are elongated along the a-axis.
4)Transmission electron microscope using single crystal : We found at room temperature clear superstructure reflections corresponding to the doubling of th cell along the a-axis. With the increase of temperature, the reflections become incommensurate, and finally disappear.
We are intending to investigate further to determine the space group and the charge order pattern, together with the magnetic structure.
|
-
-
-
-
[Journal Article] Structural properties of a mixed valence compound Fe_2BO_42007
Author(s)
Susumu, Shimomura, Shin, Nakamura, Naoshi, Ikeda, Emi, Kaneko, Kenichi, Kato, Kay, Kohn
-
Journal Title
J. Magn. Magn. Mater 310
Pages: 793-795
Description
「研究成果報告書概要(欧文)」より
-
[Journal Article] ^<57>Fe Mossbauer spectroscopy of pesudo-1D sulfide of FePb_4Sb_6S_<14>2007
Author(s)
Shotaro, Morimoto, Y., Matsushita, Y., Ueda, M., Kawase, Tadashi Saito, Shin, Nakamura, Saburo, Nasu
-
Journal Title
J. Magn. Magn. Mater 310
Pages: e962-e964
Description
「研究成果報告書概要(欧文)」より
-
-
-
[Journal Article] Mossbauer study on the mixed valence oxide Fe_2BO_42006
Author(s)
Shin, Nakamura, Shotaro, Morimoto, Tadashi, Saito, Yorihiko, Tsunoda, Kay, Kohn
-
Journal Title
Annual Report 2006, Laboratory of nuclear Studies Osaka University
Pages: 122-123
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
-
-
[Presentation] Mossbauer Spectroscopy of GaFeO_32007
Author(s)
S., Nakamura, S., Morimoto, T., Saitoh, M., Kawase, Y., Tsunoda
Organizer
62th Annual Meeting, Physical Society of Japan
Place of Presentation
Sapporo
Year and Date
2007-09-21
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
[Presentation] Magnetic structure of mixed valence oxide Fe_2BO_42007
Author(s)
S., Nakamura, S., Morimoto, T., Saitoh, M., Kawase, Y., Tsunoda, K., Kohn
Organizer
2007 Spring Meeting, Physical Society of Japan
Place of Presentation
Kagoshima
Year and Date
2007-03-19
Description
「研究成果報告書概要(欧文)」より
-
-
-
[Presentation] Structural properties of a mixed valence compound Fe_2BO_42006
Author(s)
S., Shimomura, S., Nakamura, N., Ikeda, E., Kaneko, K., Kato, K., Kohn
Organizer
International Conference on Magnetism 2006
Place of Presentation
Kyoto
Year and Date
2006-09-24
Description
「研究成果報告書概要(欧文)」より
-
[Presentation] ^<57>Fe Mossbauer spectroscopy of pesudo-1D sulfide of FePb_4Sb_6S_<14>2006
Author(s)
S., Morimoto, Y., Matsushita, Y., Ueda, M., Kawase, T., Saito, S., Nakamura, S., Nasu
Organizer
International Conference on Magnetism 2006
Place of Presentation
Kyoto
Year and Date
2006-09-24
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
-
-
