Structure of Al-Mn-Cr-Si quasicrystals studied by pulsed neutron scattering

Journal Article · Thu Jan 15 04:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.435· OSTI ID:5925502

Nanao, S; Dmowski, W; Egami, T; Richardson, Jr, J W; Jorgensen, J D

The atomic structure of rapidly quenched quasicrystals, Al/sub 80/Mn/sub 20/, Al/sub 75/Mn/sub 20/Si/sub 5/, and Al/sub 75/Mn/sub 15/Cr/sub 5/Si/sub 5/, was studied by pulsed neutron scattering. The pair distribution function was obtained by a direct Fourier transformation of the structure factor, and by assuming isomorphous substitution of Cr for Mn the differential distribution function (DDF) was determined. The addition of Si was found to increase the medium-range order significantly. The DDF from Mn atoms indicates the presence of a quasicrystalline substructure which is occupied both by Mn and Al atoms. The atomic structure of these solids, therefore, is significantly different from that of quasicrystalline Pd/sub 58.8/U/sub 20.6/Si/sub 20.6/.

• Research Organization: Department of Materials Science and Engineering, University of Pennsylvania, Philadelpha, Pennsylvania 19104-6272 and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6202
• OSTI ID: 5925502
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
DISTRIBUTION FUNCTIONS
FOURIER TRANSFORMATION
FUNCTIONS
INELASTIC SCATTERING
INTEGRAL TRANSFORMATIONS
MANGANESE ALLOYS
MULTIPLE SCATTERING
NEUTRON DIFFRACTION
PULSES
QUENCHING
SCATTERING
SILICON ALLOYS
STRUCTURE FACTORS
TRANSFORMATIONS
ULTRALOW TEMPERATURE