Stacking solitons in -phase systems and quasielastic scattering

B. Horovitz, J. L. Murray, J. A. Krumhansl

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The unusual x-ray diffuse scattering in Zr-Nb alloys is explained in terms of lattice displacements described by "stacking solitons." These constitute a structural defect in columnar -phase regions embedded in a bcc matrix. We model this situation as a one-dimensional system in which a discrepancy between the and bcc lattice constants drives the formation of stacking solitons. The density of these solitons depends on composition and temperature; in particular we suggest a commensurate-incommensurate transition at 17-wt.% Nb, so that the ground state of the higher-percent Nb alloys contains a static array of stacking solitons along the -phase column. The dynamics of such configurations is consistent with the very narrow (quasielastic) inelastic scattering observed in these alloys and has the character of a "central peak."

Original languageEnglish
Pages (from-to)3549-3558
Number of pages10
JournalPhysical Review B
Volume18
Issue number7
DOIs
StatePublished - 1 Jan 1978
Externally publishedYes

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