Al–Fe–Ge: New ternary compounds and phase equilibria at 800 °C

Reisinger, Gabriel R.; Effenberger, H.; Richter, Klaus W.

doi:10.1016/j.jallcom.2018.05.214

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…For (IV), a query for tI24 was made, and some isotypic crystals of the LiIrSn 4 type (ICSD 412252; Wu et al, 2002) were found. Limiting the results to Al-containing crystal structures, isotypic crystals in the Al-Fe-Si (ICSD 79709; Gueneau et al, 1995;ICSD 4837, 4839;Zhou et al, 2018), Al-Fe-Ge (ICSD 235910;Reisinger et al, 2018) and Al-Ge-Mn (ICSD 8608; Sasaki et al, 2019) systems were found. In these structures and that of (IV), the Li sites of the LiIrSn 4 -type structure are occupied solely by Al, whereas the Sn sites are occupied by (Al,Si) or (Al,Ge).…”

Section: Database Surveymentioning

confidence: 93%

Crystal structures of five compounds in the aluminium–ruthenium–silicon system

Kitahara,

Takakura,

Iwasaki

et al. 2023

Acta Cryst E

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Single crystals of five compounds with approximate compositions ∼Ru16(Al0.78Si0.22)47, (I), ∼Ru9(Al0.70Si0.30)32, (II), ∼Ru10(Al0.67Si0.33)41, (III), ∼Ru(Al0.57Si0.43)5, (IV), and ∼Ru2(Al0.46Si0.54)9, (V), were obtained from polycrystalline lumps mainly composed of the target compounds, and their crystal structures were determined by means of single-crystal X-ray diffraction. The crystal structure of (I) can be related to that of a cubic rational crystalline approximant to an icosahedral quasicrystal through crystallographic shear and then unit-cell twinning. The crystal structure of (II) is isotypic with that of a phase with composition ∼Fe9(Al,Si)32. The crystal structure of (III) is comprised of edge-sharing Ru(Al,Si)9–11 polyhedra with disordered chains along edges of polyhedra. The crystal structure of (IV) is of the LiIrSn4 type. The crystal structure of (V) can be viewed as a crystallographic shear structure derived from that of (IV).

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Section: Database Surveymentioning

confidence: 93%

Crystal structures of five compounds in the aluminium–ruthenium–silicon system

Kitahara,

Takakura,

Iwasaki

et al. 2023

Acta Cryst E

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“…The unit cell contains two of the condensed basic layers being mirrored at (002) δ [19,20]. The δ phase is reported to exist in space group I4/mcm [19,20] being isotypic to GaPd 5 [20], Al 2.5 Si 2.5 Mn = Mn(Al,Si) 5 [20] and Al 3 FeGe 2 = Fe(Al,Ge) 5 [36]. The presence of extra reflections, not expected for I4/mcm symmetry, in selected area electron diffraction (SAED) and convergent-beam electron diffraction (CBED) patterns were attributed to multiple scattering, planar defects causing symmetry reduction [9] or to a superstructure with orthorhombic Pbcn symmetry due to ordering of Al and Si atoms [19,21] (see Table 1).…”

Section: The Layered Crystal Structures Of the β And δ Phasementioning

confidence: 99%

“…The presence of extra reflections, not expected for I4/mcm symmetry, in selected area electron diffraction (SAED) and convergent-beam electron diffraction (CBED) patterns were attributed to multiple scattering, planar defects causing symmetry reduction [9] or to a superstructure with orthorhombic Pbcn symmetry due to ordering of Al and Si atoms [19,21] (see Table 1). In spite of the different reported symmetries, several authors consistently report that if Si or Ge is present in a phase with -phase like crystal structure alongside with Al, these atoms only occupy the corners of the square-antiprisms [19,20,36], i.e. the formula of the  phase should actually read Fe(Al,Si) 8/2 Al 2/2 .…”

Section: The Layered Crystal Structures Of the β And δ Phasementioning

confidence: 99%

β- and δ-Al-Fe-Si intermetallic phase, their intergrowth and polytype formation

Becker

Bergh

Vullum

et al. 2019

Journal of Alloys and Compounds

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Crystal structure characteristics of coexisting  and δ phase were investigated in a purely intermetallic Al-Fe-Si alloy and in plate-shaped intermetallic particles formed in a model secondary Al7.1Si1.2Fe0.3Mn alloy. The βand the δ-Al-Fe-Si intermetallic phase are thermodynamic and crystallographic distinct phases despite some structural similarities. Nevertheless, both phases can appear severely intergrown within single plate-shaped particles after solidification of Fe-containing secondary Al-Si alloys under non-equilibrium conditions which is attributed to the good fit along the (001) planes of both phases. Thereby, few layers of the δ-like stacking sequences within the β phase can be considered as a typical planar defect of the β phase. The β phase exhibits polytype structures for which structural models have been formulated based on ordering of the constituting double layers being shifted by a/2 or b/2 displacements leading to 4 different double layer positions A, B, C, and D. An AB polytype with idealized Acam symmetry actually shows a monoclinic distortion towards A12/a1 symmetry. An ABCD polytype with idealized I4 1 /acd symmetry has been derived, too. Next to the ordered polytypes, stackings with non-periodic sequences of A, B, C and D double layers exist.

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