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

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

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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Category:Materials Science, Multidisciplinary

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