journal menuBuy article online - an online subscription or single-article purchase is required to access this article.
research papers
Al5.103(Fe, Cr), orthorhombic, Imm2, a = 12.34, b = 12.41, c = 30.71 Å, V = 4701 Å3, atoms/cell = 305 (average), Dx 
3.4 g cm-3. A structural model of the non-Fibonacci approximant O-AIFeCr with composition Al5.103(Fe, Cr) found in an Al12Fe2Cr alloy has been derived from its high-resolution electron microscopy images and the structure of the hexagonal 
-Al4Mn [Shoemaker, Keszler & Shoemaker (1989). Acta Cryst. B45, 13-20], being isostructural to -Al4Cr. Among the 14 unique positions of transition metal (TM) atoms, 13 are icosahedrally coordinated: five of these icosahedra interpenetrate into each other, forming icosahedral chains along [010], and the remaining eight icosahedra with their twofold axis parallel to this axis. This structural model describes a (010) layer structure with a sequence PmFP(PmFP)I, where a flat layer F (a mirror plane) is sandwiched between two puckered P and Pm layers, and (PmFP)I is related to PmFP through a body-centred translation. The interatomic distances are 2.51-2.74 Å for TM-TM, 2.38-2.99 for TM-Al and 2.41-3.18 Å, for Al-Al. Simulated images and electron diffraction patterns calculated based on this structural model are comparable with the experimentally observed results.
3.4 g cm-3. A structural model of the non-Fibonacci approximant O-AIFeCr with composition Al5.103(Fe, Cr) found in an Al12Fe2Cr alloy has been derived from its high-resolution electron microscopy images and the structure of the hexagonal 
-Al4Mn [Shoemaker, Keszler & Shoemaker (1989). Acta Cryst. B45, 13-20], being isostructural to -Al4Cr. Among the 14 unique positions of transition metal (TM) atoms, 13 are icosahedrally coordinated: five of these icosahedra interpenetrate into each other, forming icosahedral chains along [010], and the remaining eight icosahedra with their twofold axis parallel to this axis. This structural model describes a (010) layer structure with a sequence PmFP(PmFP)I, where a flat layer F (a mirror plane) is sandwiched between two puckered P and Pm layers, and (PmFP)I is related to PmFP through a body-centred translation. The interatomic distances are 2.51-2.74 Å for TM-TM, 2.38-2.99 for TM-Al and 2.41-3.18 Å, for Al-Al. Simulated images and electron diffraction patterns calculated based on this structural model are comparable with the experimentally observed results.
Subscribe to Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
