ウエダ　ヨシオ   Ueda Yoshio   上田　良夫    所属   追手門学院大学  理工学部 電気電子工学科    職種   教授
言語種別	英語
発行・発表の年月	2018/08
形態種別	論文
査読	査読あり
標題	First principle calculations of energy of agglomerated helium in the period 6 elements
執筆形態	共著・編著（代表編著を除く）
掲載誌名	Nuclear Materials and Energy
掲載区分	国外
出版社・発行元	ELSEVIER SCIENCE BV
巻・号・頁	16,pp.226-229
著者・共著者	K. Omori,A. M. Ito,A. M. Ito,I. Mun,N. Yamashita,K. Ibano,H. T. Lee,Y. Ueda
概要	Difference of helium (He) agglomeration energies between period 6 elements, tantalum (Ta), tungsten (W), iridium (Ir) and gold (Au), is illustrated by using first principles calculations based on density functional theory (DFT). It is found that He in W and Ir can agglomerate more easily than Ta and Au. We investigate a relationship between the He agglomeration tendency and the growth of nanostructure by He plasma irradiation. Thus, the four metals are exposed to He plasma irradiation. Each metal has different structures after the He plasma exposure. Surface nanostructures of W and Ir are fuzzy fiber-like while these structures are not observed in Ta and Au. In the meantime, W and Ir have a tendency to agglomerate He atoms at a vacancy or interstitial sites easily. This correlation suggests that the He agglomeration may play a role for understanding the fuzz formation mechanism.
DOI	10.1016/j.nme.2018.07.003
ISSN	2352-1791/2352-1791
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