Epitaxial thin film growth of LiH using a liquid-Li atomic template

Hiroyuki Oguchi, Tamio Ikeshoji, Takeo Ohsawa, Susumu Shiraki, Hiroki Kuwano, Shin Ichi Orimo, Taro Hitosugi

研究成果: Article査読

10 被引用数 (Scopus)

抄録

We report on the synthesis of lithium hydride (LiH) epitaxial thin films through the hydrogenation of a Li melt, forming abrupt LiH/MgO interface. Experimental and first-principles molecular dynamics studies reveal a comprehensive microscopic picture of the crystallization processes, which sheds light on the fundamental atomistic growth processes that have remained unknown in the vapor-liquid-solid method. We found that the periodic structure that formed, because of the liquid-Li atoms at the film/MgO-substrate interface, serves as an atomic template for the epitaxial growth of LiH crystals. In contrast, films grown on the Al2O3 substrates indicated polycrystalline films with a LiAlO2 secondary phase. These results and the proposed growth process provide insights into the preparation of other alkaline metal hydride thin films on oxides. Further, our investigations open the way to explore fundamental physics and chemistry of metal hydrides including possible phenomena that emerge at the heterointerfaces of metal hydrides.

本文言語English
論文番号211601
ジャーナルApplied Physics Letters
105
21
DOI
出版ステータスPublished - 2014 11 24
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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