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Lobzenko, I.; Tsuru, Tomohito; Shiihara, Yoshinori*; Iwashita, Takuya*
Materials Research Express (Internet), 10(8), p.085201_1 - 085201_12, 2023/08
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)Unlike alloys with a crystal lattice, metallic glasses (MG) do not possess distinctive defects but demonstrate a highly heterogeneous response to mechanical deformation, even in near-elastic regimes. The difficulties in describing such non-uniform behavior hamper the prediction of the mechanical properties of MGs. We apply first-principles calculations of atomic stress in CuZr MG to reveal its response to shear strain. That approach allows one to probe such parameters as displacement vector, charge transfer, or change in chemical bonds on the lowest atomic level. We find correlations between the mentioned parameters and show the importance of atomic von Mises stress in the comprehensive description of the mechanical state of a glassy system.
Shamoto, Shinichi; Lee, M. K.*; Fujimura, Yuki; Kondo, Keietsu; Ito, Takashi; Ikeuchi, Kazuhiko*; Yasuda, Satoshi; Chang, L.-J.*
Materials Research Express (Internet), 8(7), p.076303_1 - 076303_6, 2021/07
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)Pb, Ga, and Ga doped lead free Sn-Ag-Cu solders are used to study the gallium effect for the low joint resistivity with silver sheathed DI BISCCO type H tapes. The results are reported.
Osamura, Kozo*; Machiya, Shutaro*; Kawasaki, Takuro; Harjo, S.; Kato, Takeshi*; Kobayashi, Shinichi*; Osabe, Goro*
Materials Research Express (Internet), 6(2), p.026001_1 - 026001_13, 2019/02
Times Cited Count：6 Percentile：27.03(Materials Science, Multidisciplinary)
Au(111) by an energetic oxygen moleculeTsuda, Yasutaka*; Yoshigoe, Akitaka; Teraoka, Yuden; Okada, Michio*
Materials Research Express (Internet), 3(3), p.035014_1 - 035014_8, 2016/03
Times Cited Count：5 Percentile：18.8(Materials Science, Multidisciplinary)We report a study on the surface-temperature (
) dependence of oxidation process at CuAu(111) by using a hyperthermal oxygen molecular beam and synchrotron-radiation X-ray photoemission spectroscopy. The O-1s spectra and the corresponding O-uptake curves demonstrate that Cu
O domains grow effectively at high of 400 and 500 K. The simple analysis of the O distribution suggests that the temperature-induced atomic diffusion causes the CuO domains growing thicker at 500 K. The oxidation of CuAu(111) is less efficient at = 300-500 K than that of Cu(111), demonstrating that the protective nature of CuAu against oxidation, in comparison to Cu, remains even at high .
films prepared by reactive sputtering depositionYamamoto, Shunya; Hakoda, Teruyuki; Miyashita, Atsumi; Yoshikawa, Masahito
Materials Research Express (Internet), 2(2), p.026401_1 - 026401_8, 2015/02
Times Cited Count：4 Percentile：14.59(Materials Science, Multidisciplinary)The effects of deposition temperature and film thickness on the structural and gasochromic properties of tungsten trioxide films used for the optical detection of diluted cyclohexane have been investigated. The tungsten trioxide films were prepared on SiO substrates by magnetron sputtering, with the deposition temperature ranging from 300 to 550
C in an Ar and O gas mixture. The gasochromic properties of the films, coated with a catalytic Pt layer, were examined by exposing them up to 5% cyclohexane in N gas. We found that (001)-oriented monoclinic tungsten trioxide films, with a columnar structure, grew at deposition temperatures between 400 and 450C. The gasochromic characterization of the tungsten trioxide films revealed that (001)-oriented tungsten trioxide films, with cauliflower-like surface morphology, were appropriate for the optical detection of cyclohexane.
