skip to main content


Title: A new high pressure and temperature equation of state of fcc cobalt

The high pressure and temperature equation of state of cobalt metal in the face-centered cubic phase was measured up to 57 GPa and 2400 K using the laser heated diamond anvil cell in conjunction with synchrotron X-ray diffraction. The measured region is bisected by a ferromagnetic to paramagnetic transition across the Curie temperature necessitating use of an equation of state that incorporates a 2nd order phase transition within its formalism. A third order Birch-Murnaghan equation of state with a Mie-Grüneisen-Debye thermal correction and a Hillert-Jarl magnetic correction is employed to describe the data above and below the Curie temperature. Furthermore, we find best fit parameters of V 0 = 6.753 (fixed) cm 3/mol, K 0 – 196 (3) GPa, K' – 4.7 (2), γ 0 – 2.00 (11), q – 1.3 (5), and θ 0 – 385 K (fixed).
 [1] ;  [1]
  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Grant/Contract Number:
Published Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 118; Journal Issue: 19; Journal ID: ISSN 0021-8979
American Institute of Physics (AIP)
Research Org:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; synchrotron X-ray diffraction; cobalt; ferromagnetic; equation of state; high pressure; diamond anvil cell; laser heating
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1335841; OSTI ID: 1420725