Journal
PHYSICAL REVIEW B
Volume 62, Issue 5, Pages 2965-2968Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.2965
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Pressure-induced structural phase transformations in a trivalent rare-earth metal praseodymium (Pr) were studied at room temperature in a diamond anvil cell to 103 GPa by energy dispersive x-ray diffraction using a synchrotron source. Our x-ray diffraction studies document the following crystal structure sequence: dhcp-->fcc-->distorted fcc(hR24 type)-->alpha-monoclinic(C2/m)-->alpha-uranium with increasing pressure. We measure a 16.7% volume collapse at the transition to the alpha-uranium phase at 20 GPa. The high-pressure alpha-uranium phase in Pr was found to be stable to the highest pressure of 103 GPa, which corresponds to a volume compression V/V-0=0.407.
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