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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. We find best fit parameters of V{sub 0} = 6.753 (fixed) cm{sup 3}/mol, K{sub 0} = 196 (3) GPa, K′ = 4.7 (2), γ{sub 0} = 2.00 (11), q = 1.3 (5), and θ{sub 0} = 385 K (fixed)
Authors:
;  [1]
  1. Department of Earth and Space Science, University of California Los Angeles, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
22492948
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 19; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT; CORRECTIONS; CURIE POINT; DIAMONDS; EQUATIONS OF STATE; FCC LATTICES; LASERS; PARAMAGNETISM; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; PRESSURE RANGE MEGA PA 10-100; X-RAY DIFFRACTION