In situ X-ray observation of iron using Kawai-type apparatus equipped with sintered diamond:: Absence of β phase up to 44 GPa and 2100 K -: art. no. 1126

[1] 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 beta-iron. By observing the forward and reverse transitions, it has been confirmed that epsilon-iron directly transforms into gamma phase up to ca. 44 GPa and 2100 K, excluding the stability of beta phase. The constrained epsilon-gamma phase boundary is expressed by the equation T (K) = 25 x P (GPa) + 540.