Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 18, Pages 4132-4135Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4132
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We report a new phase transition in cobalt from the magnetic epsilon(hcp) to a beta(fcc) phase, likely nonmagnetic, at 105 GPa. It occurs martensitically in an extended pressure region between 105 and 150 GPa without any apparent volume change. The fee phase of Co is in systematic accordance with the id and 5d counterparts. The pressure-volume isotherm of beta-Co resembles those of alpha(fcc)-Ni and epsilon(hcp)-Fe within 1%. The phase diagram of cobalt suggests that the fee stability increases with increasing occupancy of d-band electrons from Fe to Co to Ni.
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