Anomalous lattice-dynamical properties of a quenched diffuse. omega. phase in Zr-Nb alloys

Journal Article · Thu Nov 15 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.9420· OSTI ID:6004712

Yamada, Y ^[1]; Fuchizaki, K ^[2]

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1. Institute for Solid State Physics, The University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo (Japan)
2. Department of Physics, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken (Japan)

Anomalous lattice-dynamical properties of Zr-Nb alloys observed by neutron inelastic scattering have been analyzed based on the viewpoint that the anomaly is due to the strong lattice anharmonicity in these alloys. The large-amplitude fluctuations of the atoms in the anharmonic lattice are divided into kinematical and dynamical parts. The former is characterized by the quasistatic heterophase fluctuations, while the latter has characteristics of ordinary phonons. The scattering function due to the dynamical fluctuations under excitation of heterophase fluctuations is computed with use of molecular dynamics. The results reproduce the anomalous characteristics of the observed spectra of neutron inelastic scattering.

• OSTI ID: 6004712
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:15; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
LATTICE VIBRATIONS
ZIRCONIUM ALLOYS
INELASTIC SCATTERING
NEUTRON DIFFRACTION
PHONONS
ALLOYS
COHERENT SCATTERING
DIFFRACTION
PHASE TRANSFORMATIONS
QUASI PARTICLES
SCATTERING
360102* - Metals & Alloys- Structure & Phase Studies