Lattice Correspondence and Growth Structures of Monoclinic Mg4Zn7 Phase Growing on an Icosahedral Quasicrystal

Singh, Alok; Rosalie, Julian M.

doi:10.3390/cryst8050194

Cited by 13 publications

(14 citation statements)

References 32 publications

(28 reference statements)

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“…Particularly, its configuration contains the flattened hexagonal units connected with one or two rhombohedral units distributed along different orientations (i.e., the flattened directions respectively lie on the different planes of (002 ̅ )Al and (11 ̅ 1 ̅ )Al). Although the differentlyoriented flattened hexagonal units are similar to the atomic structure of planar defects within Mg4Zn7 reported in previous investigations [52,54], the continuously-connected flattened hexagonal units are completely inconsistent with the typical structure of Mg4Zn7 [51,52,54].…”

Section: Resultssupporting

confidence: 40%

“…That is, the fringes of Zn atoms in Wyckoff position 6(h) changed to the fringes of Zn atoms in position 2(a) [69]. Therefore, the stacking fault layer can be regarded as a kind of antiphase boundary [11], which is clearly different from the typical structure of Mg4Zn7 [51,52,54]. The growth of the layer with the antiphase against the substrate may occur by nucleation of a mismatched embryo, similar to the growth of an η2 crystal with stacking faults.…”

Section: Resultsmentioning

confidence: 93%

“…In works conducted by Singh et al [50][51][52][53], Rosalie et al [54,55], and Yang et al [56] the flattened hexagonal arrays, which are adjacent to the rhombohedral atomic arrays of η1, have frequently been observed, similar to those of Mg4Zn7 in the Mg-Zn(-Y) magnesium alloys. A previous work [52] provided comprehesive views of the transition structures in between Mg4Zn7-MgZn2, and the atomic arrays of these two phases can thereby be distinguished. The flattened hexagonal unit in the Mg4Zn7 phase is regarded as an intrinsic defect, the zone of the deficient Zn solute atoms.…”

Section: Orientation Relationshipmentioning

confidence: 83%

“…Here, a special illustration comparing the atomic structures of η1 and η9 is presented in [51,52,54]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the unit cell of Mg4Zn7 contains six differently-oriented pairs of rhombohedral arrays, enveloped by two differently-oriented pairs of a flattened hexagonal array interweaved with a rhombohedral array, as shown in Supplementary Fig. 1b (Supplementary Material II) [52]. Whether the Mg4Zn7 phase occurs during the growth of η1 in the Al-Zn-Mg-Cu aluminium alloys was not elucidated in the previous work [11].…”

Section: Orientation Relationshipmentioning

confidence: 96%

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An atomic scale structural investigation of nanometre-sized η precipitates in the 7050 aluminium alloy

et al. 2019

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Using high-angle-annular-dark-field (HAADF) scanning-transmission-electron microscopy (STEM), we have investigated η-precipitates in the Al-Zn-Mg-Cu (AA7050) aluminium alloy. The HAADF STEM images taken along the zone axes of [101 ̅ 0]η, [12 ̅ 10]η, and [0001]η illustrated the projected atomic-scale configurations of η-MgZn2 crystal. The precipitates developed in layer-by-layer growth, supplied with precursors such as Zn, Cu, and Mg, which were solute atoms segregated around the η/Al interfaces due to the higher lattice strain energy. Stacking faults and defect layers composed of flattened hexagons were frequently observed along the zone axes of [12 ̅ 10]η and [101 ̅ 0]η, respectively, and their formation was elucidated, similarly taking into account the layer-by-layer growth. Occasional coalescence between two precipitates yielded a complicated boundary or a twin-like boundary.Based on the differences in orientation relationships between η-types and the Al matrix reported to date, two new types of η precipitates have been recognized and named η4' and η12.

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Section: Resultssupporting

confidence: 40%

Section: Resultsmentioning

confidence: 93%

Section: Orientation Relationshipmentioning

confidence: 83%

“…Here, a special illustration comparing the atomic structures of η1 and η9 is presented in [51,52,54]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Orientation Relationshipmentioning

confidence: 96%

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An atomic scale structural investigation of nanometre-sized η precipitates in the 7050 aluminium alloy

et al. 2019

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Charge Transfer in Be−Ru Compounds

Agnarelli,

Prots,

Krnel

et al. 2023

Chemistry A European J

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During the investigation of the binary system Be–Ru two new phases ‐ Be7Ru4 and Be12Ru7 ‐ with similar compositions (63.6 at. % Be and 63.2 at. % Be, respectively), are discovered. They both represent new structural prototypes. The phases are located between Be2Ru (Fe2P‐type structure) and Be3Ru2 (U3Si2‐type structure) in the phase diagram. This explains why their crystal structures, solved and refined from single crystal X‐ray diffraction data, are described as 2D intergrowth of Fe2P and U3Si2 motives. The calculated electronic density of stats (DOS) reveals pronounced minima in the vicinity of the Fermi level for both compounds. Position‐space analysis of chemical bonding exhibits the formation of three‐ and four‐atomic polar bonds, involving both, Ru and Be, atoms, and a strong charge transfer from Be to the more electronegative Ru.

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Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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Lattice Correspondence and Growth Structures of Monoclinic Mg4Zn7 Phase Growing on an Icosahedral Quasicrystal

Cited by 13 publications

References 32 publications

An atomic scale structural investigation of nanometre-sized η precipitates in the 7050 aluminium alloy

An atomic scale structural investigation of nanometre-sized η precipitates in the 7050 aluminium alloy

Charge Transfer in Be−Ru Compounds

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

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