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Journal Articles

Li$$_{4}$$FeH$$_{6}$$; Iron-containing complex hydride with high gravimetric hydrogen density

Saito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki*; Aoki, Katsutoshi*; Orimo, Shinichi*

APL Materials (Internet), 2(7), p.076103_1 - 076103_7, 2014/07

 Times Cited Count:25 Percentile:67.98(Nanoscience & Nanotechnology)

Journal Articles

X-ray diffraction study on GaAs(001)-2$$times$$4 surfaces under molecular-beam epitaxy conditions

Takahashi, Masamitsu; Yoneda, Yasuhiro; Mizuki, Junichiro

Applied Surface Science, 237(1-4), p.219 - 223, 2004/10

 Times Cited Count:5 Percentile:28.90(Chemistry, Physical)

The GaAs(001)-$$(2times4)$$ reconstructed surface was investigated by in situ surface X-ray diffraction. The sample was subjected to measurements under molecular-beam epitaxy conditions without being transferred another chamber. Several X-ray diffraction patterns were measured with increasing the substrate temperature within the $$beta$$-phase of GaAs(001)-$$(2times4)$$ in a constant As flux of 5$$times$$10$$^{-7}$$ Torr. At relatively low temperatures up to 545$$^circ$$C, the observed X-ray diffraction patterns agree well to the $$beta$$2(2$$times$$4) surface. However, a different X-ray diffraction pattern was obtained at 585$$^circ$$C, while the $$2times 4$$ periodicity still persited. This change is explained by partial As-dimer desorption which results in a mixture of the $$beta$$2(2$$times$$4) and $$alpha$$2(2$$times$$4) structures.

Journal Articles

Synthesis of Al$$_{x}$$Ga$$_{1-x}$$N alloy by solid-phase reaction under high pressure

Saito, Hiroyuki; Utsumi, Wataru; Kaneko, Hiroshi*; Aoki, Katsutoshi

Japanese Journal of Applied Physics, Part 2, 43(7B), p.L981 - L983, 2004/07

 Times Cited Count:5 Percentile:23.53(Physics, Applied)

Bulk specimens of Al$$_{x}$$Ga$$_{1-x}$$N alloys covering a composition range of 0$$leq$$${it x}$$$leq$$1 were synthesized by a solid-phase reaction under high pressure. ${it In situ}$ X-ray diffraction profiles were measured to observe the alloying process, which began at around 800$$^{circ}$$C under 6.0 GPa. SEM observation and X-ray analysis of the recovered specimen indicated a uniform distribution of Al and Ga and continuous variations of the lattice constants against the composition, which implies that a solid solution of AlN and GaN is formed regardless of atomic composition.

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