Mössbauer spectroscopy, magnetic, and ab-initio study of the approximant Al76Ni9Fe15 to a decagonal Al–Ni–Fe quasicrystal

Nejadsattari, Farshad; Stadnik, Z. M.; Przewoźnik, J.; Grushko, B.

doi:10.1016/j.jallcom.2015.12.115

Cited by 11 publications

(1 citation statement)

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“…Also, Ni dominates significantly over Fe in proxidecagonite, which represents another difference with respect to the other two known synthetic periodic approximants in the Al-Ni-Fe system, i.e. Al 76 Ni 9 Fe 15 (monoclinic, space group C 2/ m 21 ) and Al 72 Ni 9 Fe 19 (hexagonal, P 6 3 / mmc 22 ).…”

Section: Discussionmentioning

confidence: 94%

Previously unknown quasicrystal periodic approximant found in space

Bindi

Pham

Steinhardt

2018

Sci Rep

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We report the discovery of Al34Ni9Fe2, the first natural known periodic crystalline approximant to decagonite (Al71Ni24Fe5), a natural quasicrystal composed of a periodic stack of planes with quasiperiodic atomic order and ten-fold symmetry. The new mineral has been approved by the International Mineralogical Association (IMA 2018-038) and officially named proxidecagonite, which derives from its identity to periodic approximant of decagonite. Both decagonite and proxidecagonite were found in fragments from the Khatyrka meteorite. Proxidecagonite is the first natural quasicrystal approximant to be found in the Al-Ni-Fe system. Within this system, the decagonal quasicrystal phase has been reported to transform at ~940 °C to Al13(Fe,Ni)4, Al3(Fe,Ni)2 and the liquid phase, and between 800 and 850 °C to Al13(Fe,Ni)4, Al3(Fe,Ni) and Al3(Fe,Ni)2. The fact that proxidecagonite has not been observed in the laboratory before and formed in a meteorite exposed to high pressures and temperatures during impact-induced shocks suggests that it might be a thermodynamically stable compound at high pressure. The most prominent structural motifs are pseudo-pentagonal symmetry subunits, such as pentagonal bipyramids, that share edges and corners with trigonal bipyramids and which maximize shortest Ni–Al over Ni–Ni contacts.

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Section: Discussionmentioning

confidence: 94%