Details

Autor(en) / Beteiligte

• Vohra, Yogesh K.
• Beaver, Steven L.
• Akella, Jagannadham
• Ruddle, Chantel A.
• Weir, Samuel T.

Titel

Ultrapressure equation of state of cerium metal to 208 GPa

Ist Teil von

• Journal of applied physics, 1999-02, Vol.85 (4), p.2451-2453

Erscheinungsjahr

1999

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report static pressure compression of cerium metal to 208 GPa (volume compression V/V0=0.37) in a diamond anvil cell at room temperature. Cerium is unique in the 4f elements because of proximity of the f shell to the Fermi energy and related phase transformations induced by pressure. The energy-dispersive x-ray diffraction studies were carried out on cerium metal to 208 GPa using a synchrotron x-ray source and an internal copper pressure standard. A collapsed body centered tetragonal phase is found to be stable to the highest pressure with axial ratio remarkably constant at 1.680±0.006 in the 90–208 GPa pressure range in excellent agreement with theory. Cerium is thus isostructural and isoelectronic with 5f-band metal thorium at ultrapressures. We present equation of state parameters, which describe the compression of cerium to ultrapressures.