Abstract
High-pressure Raman measurements of type-III germanium clathrate Ba24Ge100 have been made up to 26 GPa at room temperature. We observed low-frequency vibrational (rattling) modes associated with guest Ba atoms at 25–50 cm−1, and host Ge framework vibrations around 50–250 cm−1, which are compared with those of silicon clathrate Ba24Si100. High-pressure phase transition was found at 3.2 GPa, which seems to be due to the structural distortion combined with the enhanced guest-host interactions. Ba24Ge100 becomes irreversibly amorphous at pressures above 22 GPa. This pressure is less than that of type-I Ba8Ge43 clathrate, indicating that type-III structure is less stable than type-I Ge clathrate under high pressures.
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