Crystal structure of a cubic Al70Pd23Mn6Si; a 2/1 rational approximant of an icosahedral phase
Abstract
The structure of a cubic Al69.5Pd23.0Mn6.2Si1.3 phase, which is referred as a 2/1 approximant of an icosahedral phase, was determined by means of single crystal X-ray structural analysis: space group Pm3 (No. 200), a = 20.211(2) Å, V = 8255.9(14) Å3, MoKα, (λ = 0.71069 Å); refined as Al69.6Pd24.3Mn6.1, atom/cell = 512.83, F(000) = 11154.6, μ = 8.72 mm−1, Dcalc = 4.95 Mgm−3, R(wR2) = 0.0623(0.1691) for 2597 reflections with I > 2.0σ(I) and goodness of fit S = 1.096 for 165 variables. In the cubic 2/1 approximant structure, an atom cluster with about 20 Å in diameter locates at the origin of the unit cell. This large cluster can be described by nine atomic shells with icosahedral symmetry, where the atomic arrangements similar to the Bergman or double Mackay clusters are clearly identified together with the τ-inflated relationships in their sizes. The icosahedral quasicrystals in Al–Pd– Mn system are considered to be realized by a quasi-periodic arrangement of the similar atom clusters.
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Artikel in diesem Heft
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- Connecting icosahedral and dodecagonal order
- A warning in indexing triclinic powder diffraction data
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- The crystal chemistry of doyleite, Al(OH)3
- Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi2O6
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- Single crystal structure determination of cetylpyridiniumammonium bromide and Rietveld structure determination of cetylquinuclidinium bromide
- The modulated structure of 4-hydroxyphenyl 6-O-[(3R)-3,4-dihydroxy-2-methylenebutanoyl]-β-D-glucopyranoside, C17H22O10
Artikel in diesem Heft
- Al13Os4-type monoclinic phase and its orthorhombic variant in the Al–Co alloy system
- Connecting icosahedral and dodecagonal order
- A warning in indexing triclinic powder diffraction data
- A lithium molybdenum(V) monophosphate, Li3(MoO)2(PO4)3 structurally related to Li2Na(MoO)2(PO4)3
- Crystal structure of a cubic Al70Pd23Mn6Si; a 2/1 rational approximant of an icosahedral phase
- The crystal chemistry of doyleite, Al(OH)3
- Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi2O6
- New phases RCu5Sn (R=La, Ce, Pr, Nd, Sm, Gd) and Ce2Cu9Sn2.65
- The crystal structure of 2,3-dihydro-2,2,4-trimethyl-1H-1,5-benzodiazepinium perchlorate
- Structure of (E)-6,7,8,9-tetradeoxy-1,2:3,4-di-O-isopropylidene-7-nitro-α-D-galacto-non-6-eno-1,5-pyranose
- Crystal structure of guanidinium squarate dihydrate: C4O4 · 2C(NH2)3 · 2H2O
- Single crystal structure determination of cetylpyridiniumammonium bromide and Rietveld structure determination of cetylquinuclidinium bromide
- The modulated structure of 4-hydroxyphenyl 6-O-[(3R)-3,4-dihydroxy-2-methylenebutanoyl]-β-D-glucopyranoside, C17H22O10
