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Journal Articles

Growth of single-phase nanostructured ErO thin films on Si (100) by ion beam sputter deposition

Mao, W.*; Fujita, Masaya*; Chikada, Takumi*; Yamaguchi, Kenji; Suzuki, Akihiro*; Terai, Takayuki*; Matsuzaki, Hiroyuki*

Surface & Coatings Technology, 283, p.241 - 246, 2015/12

https://doi.org/10.1016/j.surfcoat.2015.10.060

Times Cited Count：3 Percentile：13.89(Materials Science, Coatings & Films)

Single-phase nanocrystalline thin films of ErO (440) has been first prepared using Si (100) substrates by ion beam sputter deposition at 973 K at a pressure of 10 $^{-5}$ Pa and - annealing at 1023 K at a pressure of 10 $^{-7}$ Pa. Er silicides formed during the deposition are eliminated via the annealing, which results in the single phase and the smooth surface of the ErO thin films. The epitaxial relationship between Si (100) and ErO (110) is clarified by X-ray diffraction and reflection high energy electron diffraction.

Journal Articles

Adsorption of H atoms on cubic ErO (001) surface; A DFT study

Mao, W.*; Chikada, Takumi*; Shimura, Kenichiro*; Suzuki, Akihiro*; Yamaguchi, Kenji; Terai, Takayuki*

Journal of Nuclear Materials, 443(1-3), p.555 - 561, 2013/11

https://doi.org/10.1016/j.jnucmat.2013.08.017

Times Cited Count：3 Percentile：25.73(Materials Science, Multidisciplinary)

In this work, calculations based on density functional theory (DFT) and generalized gradient approximation were performed to investigate the structural and electronic properties of the cubic Er $_{2}$ O $_{3}$ (001) surface and H adsorption processes on this surface. Several stable adsorption sites were identified, and at the most energetically favorable adsorption sites it was found that H bonds with O atoms at the cubic Er $_{2}$ O $_{3}$ (001) surface with an adsorption energy of 295.68 kJ mol $^{-1}$ at coverage 1/8 ML, which was inclined to decrease with the increase of H coverage ( 1/4 ML). In addition, the calculations revealed that the dissociative H atom configurations have adsorption energies that are at least 152.64 kJ mol $^{-1}$ greater than the H molecule configurations on the surface. These results are discussed in regard of the hydrogen isotope permeation behavior in the tritium permeation barrier in a fusion reactor.