Quantum Science and Engineering of Materials Course (QSEMC)
Creation and Precise Analyses of New Materials
The QSEMC involves Theoretical Physics, Experimental Solid-State Physics, and Materials Science and Engineering. Each of sub-categories provides their own unique items based on physics and/or physicochemical approaches on the subjects involving elementary particles, strongly correlated electron systems, metal alloy, functional materials, and composite materials.
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Chihiro Iwamoto Lab.
Mg-Zn-Y alloy with long-period-stacking-ordered (LPSO) structures is actively studied due to its excellent mechanical properties. Toward practical use, ultrasonic welding was applied, and the interface microstructure was investigated using scanning transmission electron microscopy. In the fine grains around the interface, Zn and Y segregated at mainly two atomic layers in the basal plane of the Mg hcp structure. It was suggested that L12 type Zn/Y units produced from the LPSO phase during the ultrasonic welding.
Tsuyoshi Nishi Lab.
The lattice parameters of (Am0.50U0.50)O2.0, (Am0.37U0.63)O2.0, and (Am0.50U0.50)O2−x were determined by powder X-ray diffraction with Cu Kα radiation. In addition, the lattice parameter functions of (AmyU1−y)O2−x (0.00<x<0.25, 0.00<y<0.50) were evaluated using models of (Am3+yU4+1−2yU5+y)O2 and (Am3+yU4+1−y)O2−y/2 based on the results of X-ray diffraction and the ionic radii of Am3+, U4+, and U5+. In order to confirm the valence state of Am and U in (AmyU1−y)O2−x, the X-ray absorption near-edge structure measurements were performed in the transmission mode at the Am-LIII and U-LIII absorption edges of (Am0.50U0.50)O2.0, (Am0.50U0.50)O2−x, and UO2.0.
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