Structure analysis and stability field of β-iron at high P and T
2000; Mineralogical Society of America; Volume: 85; Issue: 2 Linguagem: Inglês
10.2138/am-2000-2-315
ISSN1945-3027
AutoresD. Andrault, G. Fiquet, Thomas Charpin, Tristan Le Bihan,
Tópico(s)X-ray Diffraction in Crystallography
ResumoNew synchrotron X-ray diffraction data confirm our previous report of the transformation of the hexagonal close-packed (hcp) phase of iron to the Pbcm orthorhombic lattice (β-iron) at high P and T. The volume differences between the e and β, and the β and γ polymorphs are determined as 1.4 and 1.8%, respectively, indicating positive Clapeyron slopes between these polymorphs in the P-T phase diagram. All three polymorphs have a similar bulk modulus between 30 and 60 GPa.
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