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研究活動

Single Crystal Structure Analysis of a single Sm2Fe17N3 particle

The 58th Annual Magnetism and Magnetic Materials (MMM) Conference

N. Inami ( KEK )
Y. Takeichi ( KEK )
T. Ueno ( NIMS )
K. Saito ( KEK )
R. Sagayama ( KEK )
R. Kumai ( KEK )
K. Ono ( KEK )

Abstract

Sm-Fe-N magnet has both large saturation magnetization and magnetic hardness parameter of κ>1, and is considered to be the promising material for high maximum energy product permanent magnet.
[1,2] Up to now, only Sm-Fe-N bond magnets is commercially available, because sintering process of the Sm-Fe-N powder is difficult due to the decomposition of Sm-Fe-N to Fe and Sm-N at 650˚C.
[3].Although crystal structure analysis is important for the research and development of particulate magnetic materials such as Sm-Fe-N and Fe-N, analysis of powder diffraction data is sometimes difficult due to the magnetic interaction between particles.
In this study, we have succeeded in the single crystal structure analysis of a Sm2Fe17N3 particle.
In order to obtain an isolated Sm-Fe-N particle, we have developed a pick-up system combining with a micromanipulator driven by a piezo actuator and a microgripper fabricated by MEMS.
Fig. 1 shows the schematic of the pick-up system.
We can pick a particle with the size from a few micrometer to several hundred micrometer using this pick-up system and set the particle to a glass rod for x-ray diffraction measurement.
Sm-Fe-N particle with the diameter of about 20 μm was picked up and measured by using x-ray diffractometer with 2D imaging plate detector at Photon Factory, KEK.
Sharp Bragg reflection spots were observed and highresolution data with high statistics were obtained.
Table 1 shows the crystallographic parameters obtained from the single crystal structure analysis. Rfactor and GOF are 1.94% and 0.831, respectively.
Using this method, we have determined the relationship between the morphology of the particles and the crystal structure.


研究活動

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合