A new ultra-high pressure phase in samarium
Abstract
Structural changes in samarium under pressure were studied in a diamond-anvil cell (DAC) to 189 GPa. A number of phase transformations were observed between room pressure and 75GPa. At about 91 GPa samarium transforms to a body-centered tetragonal structure, and the unit cell parameters at 189 GPa are a=2.402(4) Å and c=4.231(17) Å, V=24.40(12) Å3 and Z=2. Identification of a body-centered tetragonal phase in Sm at about 90 GPa, which is similar to that reported in Ce, suggests that this phase could appear in other rare-earth elements too.
- Publication:
-
Physics Letters A
- Pub Date:
- August 1991
- DOI:
- 10.1016/0375-9601(91)90346-A
- Bibcode:
- 1991PhLA..158...89V