Phase Transformations in Heavy Rare Earth Metal Lutetium to 270GPa.

Abstract

The high-pressure structural phase transformations in a heavy rare earth metal lutetium (Lu) were studied by energy dispersive x-ray diffraction at room temperature using a synchrotron source in a diamond anvil cell. A new phase transition Sm-type→double-h. c. p was observed at 45±5 GPa. Distorted f. c. c phase was observed at megabar pressure range. Crystal structure data is presented to 270 GPa and results are discussed within the framework of s→d electron transfer under high pressures.