ATOMIC VOLUMES OF RARE-EARTH-METALS UNDER PRESSURES TO 40 GPA AND ABOVE

High-pressure studies on most of the rare-earth metals using diamond anvil cells and energy-dispersive x-ray diffraction with either a conventional x-ray source or synchrotron radiation are presented, together with a systematic comparison of the results on the equations of state. This comparison leads to simple scaling relations for the regular rare-earth metals and to distinct deviations for the anomalous or "collapsed" phases.