Inelastic neutron scattering of {gamma}-iron, and the determination of the elastic constants by lattice dynamics

Technical Report · Fri Oct 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10188986· OSTI ID:10188986

Stassis, C

The physical properties of the various phases of iron have been the subject of numerous of numerous theoretical and experimental investigations. Of particular interest is the appearance of the fcc {gamma}-phase between approximately 1,200 K and 1,670 K. The authors were able to growth in situ single crystals of fcc iron of sufficient size to perform an inelastic neutron scattering study of the lattice dynamics of this phase of iron. The phonon dispersion curves along the [00{xi}],[{xi}{xi}0] and [{xi}{xi}{xi}] symmetry directions were measured at 1,428 K. A limited number of phonons were also measured at 1,227 K and 1,640 K to assess the temperature dependence of the phonon frequencies. The data collected at 1,428 K were used to evaluate the elastic constants, the phonon density of states and the lattice contribution to the specific heat. The measured dispersion curves of {gamma}-Fe are qualitatively similar to those of Ni (measured at 296 K) and Ni{sub 0.3}Fe{sub 0.7} (measured at 296 and 573 K).

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 10188986
• Report Number(s): IS-M-765; CONF-930676-57; ON: DE94000694; TRN: 93:024008
• Resource Relation: Conference: 14. international conference of the International Association for the Advancement of High Pressure Science and Technology,Colorado Springs, CO (United States),27 Jun - 2 Jul 1993; Other Information: PBD: [1993]
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
IRON-GAMMA
PHASE STUDIES
PHYSICAL PROPERTIES
NEUTRONS
INELASTIC SCATTERING
PHONONS
TEMPERATURE DEPENDENCE
EXPERIMENTAL DATA
TEMPERATURE RANGE 1000-4000 K
SPECIFIC HEAT
STABILITY
MAGNETIC PROPERTIES
360102
360104
665100
STRUCTURE AND PHASE STUDIES
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS