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A new high pressure and temperature equation of state of fcc cobalt
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The high pressure and temperatureequation 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 paramagnetictransition 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 V0 = 6.753 (fixed) cm3/mol, K0 = 196 (3) GPa, K′ = 4.7 (2), γ0 = 2.00 (11), q = 1.3 (5), and θ0 = 385 K (fixed).
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