Ni synchrotron radiation-based M
ssbauer spectroscopy of nickel-based nanoparticles with hexagonal structure
六方晶構造を有するニッケル基ナノ粒子の放射光メスバウアー分光
増田 亮*; 小林 康浩*; 北尾 真司*; 黒葛 真行*; 齋藤 真器名*; 依田 芳卓*; 三井 隆也; 細井 浩平*; 小林 浩和*; 北川 宏*; 瀬戸 誠
Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Hosoi, Kohei*; Kobayashi, Hirokazu*; Kitagawa, Hiroshi*; Seto, Makoto
We measured the SR M
ssbauer spectra of Ni nanoparticles with a hexagonal structure that were synthesized by chemical reduction. To obtain M
ssbauer spectra of the nanoparticles without 61-Ni enrichment, we developed a measurement system for
Ni SR M
ssbauer absorption spectroscopy without X-ray windows between the standard energy alloy and detector. The counting rate of the
Ni nuclear resonant scattering in the system was enhanced by the detection of internal conversion electrons and the close proximity between the energy standard and the detector. The spectrum measured at 4 K revealed the internal magnetic field of the nanoparticles was 3.4 T, corresponding to a Ni atomic magnetic moment of 0.3 Bohr magneton. This differs from the value of Ni
C and the theoretically predicted value of hexagonal closed packed Ni and suggested the nanoparticle possessed intermediate carbon content between hcp-Ni and Ni
C of approximately 10 atomic percent of Ni.