Abstract
Stability relations of iron have been studied by means of in situ X‐ray observations using an eight cubic anvil system (Kawai‐type apparatus) equipped with sintered diamond (SD), in order to explore the stability of β‐iron. By observing the forward and reverse transitions, it has been confirmed that ε‐iron directly transforms into γ phase up to ca. 44 GPa and 2100 K, excluding the stability of β phase. The constrained ε‐γ phase boundary is expressed by the equation T (K) = 25 × P (GPa) + 540.
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