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High-pressure study of ScH$$_{3}$$; Raman, infrared, and visible absorption spectroscopy

ScH$$_{3}$$の高圧研究; ラマン,赤外・可視光吸収分光

久米 徹二*; 大浦 裕之*; 竹市 知生*; 大村 彩子*; 町田 晃彦; 綿貫 徹; 青木 勝敏; 佐々木 重雄*; 清水 宏晏*; 竹村 謙一*

Kume, Tetsuji*; Oura, Hiroyuki*; Takeichi, Tomoo*; Omura, Ayako*; Machida, Akihiko; Watanuki, Tetsu; Aoki, Katsutoshi; Sasaki, Shigeo*; Shimizu, Hiroyasu*; Takemura, Kenichi*

ScH$$_{3}$$の圧力誘起構造及び電子転移を調べるため、ラマン,赤外・可視光吸収スペクトルを室温下、50GPaまで観測した。hcp-中間相と中間相-fcc転移がそれぞれ25GPaと46GPaで観測された。中間相の構造はYH$$_{3}$$で報告されている長周期構造と同じと思われる。ScH$$_{3}$$の光学ギャップは1.7eVから減少し、50GPa付近でfcc構造への転移を伴って閉じる。

Raman, IR, and visible absorption spectra of scandium trihydride (ScH$$_{3}$$) have been measured at high pressures up to 50 GPa at room temperature. The structural and electronic phase transitions were investigated. Successive hcp-intermediate-fcc phase transitions took place at 25 and 46 GPa. It was suggested that the intermediate phase of ScH$$_{3}$$ has the same structure as that of YH$$_{3}$$. The energy gap of ScH$$_{3}$$ is 1.7 eV at the ambient condition and is closed around 50 GPa, at which the crystal structure transforms to fcc.

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パーセンタイル:59.79

分野:Materials Science, Multidisciplinary

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