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Journal Articles

Magnetic and structure transition of Mn$$_{3-x}$$Fe$$_x$$O$$_4$$ solid solutions under high-pressure and high-temperature conditions

Yamanaka, Takamitsu*; Hirao, Naohisa*; Nakamoto, Yuki*; Mikouchi, Takashi*; Hattori, Takanori; Komatsu, Kazuki*; Mao, H.-K.*

Physics and Chemistry of Minerals, 49(10), p.41_1 - 41_14, 2022/10

https://doi.org/10.1007/s00269-022-01215-4
 Times Cited Count：0 Percentile：0.02(Materials Science, Multidisciplinary)

Magnetic and crystal structure of Mn$$_{3-x}$$Fe$$_x$$O$$_4$$ solid solutions under high-PT conditions are investigated by neutron diffraction and synchrotron M${"o}$ssbauer spectroscopy. The ferrimagnetic-paramagnetic transition and tetragonal-cubic transition of Mn$$_2$$FeO$$_4$$ spinel occur at 100$$^circ$$C and 180$$^circ$$C, respectively, suggesting both the transitions are not coupled. The structure transition temperature decreases with pressure. M${"o}$ssbauer experiments and neutron diffraction revealed that the Fe$$^{2+}$$ occupancy in tetrahedral site increases increase with pressure, suggesting Mn$$_2$$FeO$$_4$$ phase approaches inverse spinel. Magnetic structure refinement clarified paramagnetic and ferrimagnetic structure of MnFe$$_2$$O$$_4$$ and Mn$$_2$$FeO$$_4$$. These spinels transform into high-pressure orthorhombic phases at 18.4 and 14.0 GPa, respectively, indicating lower transition pressure with increasing Mn content.

Journal Articles

Neutron diffraction study on martensitic transformation under compressive stress in an ordered Fe$$_{3}$$Pt

Fukuda, Takashi*; Yamaguchi, Takashi*; Kakeshita, Tomoyuki*; Harjo, S.; Nakamoto, Tatsushi*

Journal of Applied Physics, 126(2), p.025107_1 - 025107_6, 2019/07

AA2019-0505.pdf:1.15MB

https://doi.org/10.1063/1.5098960
 Times Cited Count：1 Percentile：5.51(Physics, Applied)

Journal Articles

Development of ITER CODAC compatible gyrotron local control system and its operation

Oda, Yasuhisa; Oshima, Katsumi; Nakamoto, Takashi*; Hashimoto, Yasunori*; Yamamoto, Tsuyoshi; Hayashi, Kazuo*; Ikeda, Yukiharu; Ikeda, Ryosuke; Kajiwara, Ken; Takahashi, Koji; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 90(7), p.365 - 373, 2014/07

https://cir.nii.ac.jp/crid/1570854177951360512

no abstracts in English

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