Comment on: "Different Results for the Equilibrium Phases of Cerium above 5 GPa"
J. R\"ohler (U K\"oln)
TL;DR
This paper discusses how the observed single structure of cerium above 5 GPa is due to non-equilibrium conditions, despite multiple phases coexisting at these pressures.
Contribution
It clarifies that the apparent single phase results from experimental conditions rather than true equilibrium, challenging previous interpretations.
Findings
Fractional valence of cerium remains pressure-independent between 5-12 GPa.
Multiple structural phases coexist in this pressure range.
Observed single structure is a non-equilibrium artifact.
Abstract
In the pressure range 5-12 GPa the fractional valence of cerium is independent of pressure because of the coexistence of two or more structural phases. The observation of a single crystallographic structure in this pressure range arises from a non-equilibrium situation induced by the initial conditions of the high pressure experiment.
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Taxonomy
TopicsHigh-pressure geophysics and materials · Rare-earth and actinide compounds · Thermodynamic and Structural Properties of Metals and Alloys