[11a-E215-1~7] CS.10 Code-sharing session of 6.5&7.5

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[11a-E215-6] Oxide-formation process on Zr(0001)

〇(DC)Masaaki Ando¹, Naoto Nishimura¹, Jeffrey Tanudji², Muhammad Irfandi³, Takahiro Ozawa³, Yasutaka Tsuda⁴, Akitaka Yoshigoe⁴, Katsuyuki Fukutani^3,4, Michio Okada^1,2 (1.Grad. Sci. U. Osaka, 2.IRS U. Osaka, 3.IIS Univ. of Tokyo, 4.JAEA)

Keywords:

Zirconium,Oxidation,X-ray photoelectron spectroscopy

In the Fukushima Daiichi nuclear power plant accident, Zr in the fuel cladding reacted with water molecules and was oxidized, leading to a hydrogen explosion. The process of oxygen uptake from the Zr surface is not clear. In this study, oxygen molecules were exposed to clean Zr(0001), and the surface structure and electronic state were elucidated using low energy electron diffraction and synchrotron radiation X-ray photoelectron spectroscopy. As a result, a (2×2) LEED pattern was observed, and the O 1s XPS spectrum suggested the presence of two or more adsorption sites.