Journal of Applied Physics · 1967 · 311 citations · 12 references
Natural SciencesChemistryMaterials ScienceCrystal StructurePhase TransformationsSolid State PhysicsCrystal ChemistryMetalsPhase DiagramsPhase TransitionsX-ray CrystallographyX-ray DiffractionHigh-pressure CrystallographyHigh-pressure Phase TransformationsHigh-pressure Phase TransitionsLattice ParametersPhase Transformations In Iron AlloysVolume ChangeVolume Change BehaviorX-ray Diffraction Analysis
X‑ray diffraction measured bcc and hcp iron lattice parameters up to 300 kbar at ~23 °C. The c/a ratio of hcp iron is 1.603±0.001 and pressure‑independent between 80–300 kbar, the extrapolated zero‑pressure volume is 6.72±0.06 cm³/mol, the bcc‑hcp transition at 130 kbar involves a −0.34±0.01 cm³/mol volume change, and these values satisfy the bcc‑hcp‑fcc triple‑point conditions.
Lattice parameters of the bcc and hcp phases of iron have been determined as a function of pressure up to 300 kbar at 23°±3°C by means of x-ray diffraction techniques. The c/a ratio for hcp iron has been determined to be 1.603±0.001 at pressures between 80 and 300 kbar and is independent of pressure. Based upon the extrapolation of the high-pressure data using an exponential form of the Murnaghan equation of state, the volume of hcp iron at zero pressure is 6.72±0.06 cm3/mole. The volume change for the bcc-hcp transformation at 130 kbar is −0.34±0.01 cm3/mole. This value satisfies the triple point conditions for the bcc-hcp-fcc triple point when published values for the other phase transformations are used.
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The lattice stability of metals—III. Iron
Larry Kaufman, E.V. Clougherty, R. J. Weiss · Acta Metallurgica · 1963 · 386 citations
Natural Sciences, Materials Engineering, Materials Science +14