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New beta(fcc)-cobalt to 210 GPa

Yoo¹, Cynn, Soderlind

¹H-Division, Physics Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA.

Physical Review Letters

|September 16, 2000

Summary

Researchers discovered a new cobalt phase transition at 105 GPa, moving from magnetic to a likely nonmagnetic phase. This martensitic transition occurs over a wide pressure range without volume change, impacting cobalt phase diagrams.

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Area of Science:

Materials Science
Condensed Matter Physics
High-Pressure Physics

Background:

Cobalt exhibits complex phase behavior under extreme conditions.
Understanding phase transitions is crucial for materials science and geophysics.

Purpose of the Study:

To investigate the high-pressure phase transitions of cobalt.
To characterize the properties of cobalt phases at pressures exceeding 100 GPa.

Main Methods:

High-pressure experiments utilizing diamond anvil cells.
Analysis of structural and magnetic properties through X-ray diffraction and other techniques.

Main Results:

A novel phase transition in cobalt was identified at 105 GPa.
The transition is from a magnetic epsilon (hcp) phase to a likely nonmagnetic beta (fcc) phase.
This martensitic transition occurs over an extended pressure range (105-150 GPa) with no significant volume change.

Conclusions:

The observed fcc phase of cobalt aligns with 4d and 5d transition metal trends.
Cobalt's pressure-volume isotherm closely matches that of nickel and iron.
The study suggests increasing fcc stability with d-band electron occupancy across Fe, Co, and Ni.

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