High-pressure phase transitions in rare earth metal thulium to 195 GPa.
Identifieur interne : 000988 ( Main/Merge ); précédent : 000987; suivant : 000989High-pressure phase transitions in rare earth metal thulium to 195 GPa.
Auteurs : Jeffrey M. Montgomery [États-Unis] ; Gopi K. Samudrala ; Georgiy M. Tsoi ; Yogesh K. VohraSource :
- Journal of physics. Condensed matter : an Institute of Physics journal [ 1361-648X ] ; 2011.
Abstract
We have performed image plate x-ray diffraction studies on a heavy rare earth metal, thulium (Tm), in a diamond anvil cell to a pressure of 195 GPa and volume compression V/V₀ = 0.38 at room temperature. The rare earth crystal structure sequence, hcp →Sm-type→ dhcp →fcc → distorted fcc, is observed in Tm below 70 GPa with the exception of a pure fcc phase. The focus of our study is on the ultrahigh-pressure phase transition and Rietveld refinement of crystal structures in the pressure range between 70 and 195 GPa. The hexagonal hR-24 phase is seen to describe the distorted fcc phase between 70 and 124 GPa. Above 124 ± 4 GPa, a structural transformation from hR 24 phase to a monoclinic C 2/m phase is observed with a volume change of -1.5%. The equation of state data shows rapid stiffening above the phase transition at 124 GPa and is indicative of participation of f-electrons in bonding. We compare the behavior of Tm to other heavy rare-earths and heavy actinide metals under extreme conditions of pressure.
DOI: 10.1088/0953-8984/23/15/155701
PubMed: 21460429
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