High-pressure synchrotron study demonstrates three distinct amorphous phases in a cerium-based metallic glass, highlighting an electronic transition linked to crystalline cerium.
We report here on a polyamorphic-phase transition upon application of pressure on a Ce-based metallic glass, Ce₇₀Al₁₀Ni₁₀Cu₁₀, investigated by x-ray diffraction and inelastic x-ray scattering. This alloy is found to display a strong hysteresis in volume per atom upon application and subsequent release of pressure. The observed structural changes are correlated with changes observed by inelastic x-ray scattering in the elastic constants, acoustic mode frequencies, and sound speed. The results reported here point toward three different amorphous phases for this alloy existing in the 0--25 GPa pressure region: low- and high-density states and an intermediate mixed state that displays a hysteresis behavior. Finally, we discuss the impact of Ce concentration on the polyamorphic transition for a series of Ce-based metallic glass alloys and link it to the phase transformation between γ-Ce and α-Ce under pressure.
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Duarte et al. (2011) studied this question.
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