Icosahedral quasicrystals and their cubic approximants in the Cd-Mg-RE (RE = Y, Sm, Gd, Tb, Dy, Ho, Er, Tm) systems

Labib, Farid; Fujita, Nobuhisa; Ohhashi, Satoshi; Tsai, A.‐P.

doi:10.1016/j.jallcom.2019.153541

Cited by 12 publications

(17 citation statements)

References 72 publications

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“…In this study, single grains of the Y-Cd-Mg 2/1 and 1/1 cAPs and the Er-Cd-Mg 2/1 cAP that had been previously synthesized by the self-flux method were studied by SXRD experiment. The details of synthesis and characterization can be found elsewhere (Labib et al, 2019;Labib et al, 2020). The evaluated compositions of these alloys using scanning electron microscopy with energy-dispersive X-ray spectroscopy are Y 12.7 Cd 61.8 Mg 25.5 and Er 12.5 Cd 72.0 Mg 15.5 for the 2/1 cAPs and Y 14.5 Cd 66.1 Mg 19.4 for the 1/1 cAP.…”

Section: Methodsmentioning

confidence: 99%

“…To date, however, the only reported 2/1 cAPs in binary alloy systems, YbCd 5.8 and Ca 13 Cd 76 , are free from chemical disorder, in that the icosahedron shell and diagonal positions of DFP are purely occupied by Yb and Ca, respectively (Pay Go ´mez & Lidin, 2001). Meanwhile, new 2/1 cAPs were found in ternary R-Cd-Mg (R = Gd to Tm, and Y) alloy systems (Labib et al, 2019(Labib et al, , 2020 with the concentration of the large atoms (i.e. R) being significantly lower than that in YbCd 5.8 and Ca 13 Cd 76 2/1 cAPs.…”

Section: Introductionmentioning

confidence: 98%

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2/1 and 1/1 cubic approximants in the ternary R-Cd-Mg (R = Y, Er) systems

Yamada

Fujita

Labib

2021

Acta Crystallogr Sect B

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The atomic structures of three cubic approximants (cAPs), Y12.7Cd61.8Mg25.5 [2/1 cAP with space group Pa 3, a = 25.0654 (1) Å] and Er12.5Cd72.0Mg15.5 [2/1 cAP with Pa 3, a = 24.9658 (1) Å], and Y14.5Cd66.1Mg19.4 [1/1 cAP with Im 3, a = 15.4577 (1) Å], were investigated using X-ray structure analysis. The two 2/1 cAPs were found to be isostructural to the binary 2/1 cAP, YbCd5.8, which is composed of two building units, namely Tsai-type rhombic triacontahedron (RTH) cluster and double-Friauf polyhedron (DFP). The 1/1 cAP, in contrast, was found to be isostructural to the binary 1/1 cAP, YbCd6, which is composed solely of the RTH cluster. The refined structure models of the three cAPs exhibit substitutional disorders due to the Mg content that enters into Cd sites of the parent binary cAPs. In addition, in the 2/1 cAPs, the Y3(Er3) site on the third icosahedron shell of the RTH cluster and two positions inside DFP, Y5(Er5) sites, are partially mixed with Mg. Moreover, characteristic positional disorders owing to orientational disorder in the first shell of the RTH cluster is observed in all the three cAPs. A close relationship between the occupational disorder of the Y3(Er3) and Y5(Er5) sites in 2/1 cAPs and the elemental distribution in their first coordination shells is revealed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

2/1 and 1/1 cubic approximants in the ternary R-Cd-Mg (R = Y, Er) systems

Yamada

Fujita

Labib

2021

Acta Crystallogr Sect B

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“…Most of these quasicrystals were discovered in the early 1990s by Inoue, Tsai and collaborators. In addition to Al-based systems, other important metallic systems forming quasicrystals are worth mentioning, such as Mg-based [17,18,19,20], Ti-based [21,22], and Cd-based [23,24].…”

Section: General Aspects Of Quasicrystals and The Motivation For Using Them As Reinforcing Phases In Compositesmentioning

confidence: 99%

Recent developments on fabrication of Al‐matrix composites reinforced with quasicrystals: From metastable to conventional processing

Wolf

Bolfarini

Kiminami

2021

Journal of Materials Research

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Quasicrystalline alloys and their composites have been extensively studied due to their complex atomic structures, mechanical properties, and their unique tribological and thermal behaviors. However, technological applications of these materials have not yet come of age and still require additional developments. In this review, we discuss the recent advances that have been made in the last years toward optimizing fabrication processes and properties of Al‐matrix composites reinforced with quasicrystals. We discuss in detail the high‐strength rapid‐solidified nanoquasicrystalline composites, the challenges involved in their manufacturing processes and their properties. We also bring the latest findings on the fabrication of Al‐matrix composites reinforced with quasicrystals by powder metallurgy and by conventional metallurgical processes. We show that substantial developments were made over the last decade and discuss possible future studies that may result from these recent findings.

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“…In particular, very recently Labib et al. reported on an extensive investigation of the phase relation between ACs and QCs in the ternary RE−Mg−Cd systems (RE=Y, Sm, Gd, Tb, Dy, Ho, Er, Tm), for which 20–25 % of Cd can be replaced by Mg, [8] and the magnetic properties of the ternary ACs and QCs [9] . Pay Gómez and Tsai studied the crystal chemical effects of Mg substitution in YbCd 6 [10] and found a pronounced preference for Mg to locate on three of the seven sites constituting the Cd substructure.…”

Section: Introductionmentioning

confidence: 99%

Chemical speciation in Gd−Cd−M (M=Zn, Au) quasicrystal approximants

Gebresenbut

Gómez

Eriksson

et al. 2021

Zeitschrift anorg allge chemie

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We investigated the effect of partial replacement of Cd by M=Au and Zn in the crystal structure of the 1/1 Tsai‐type quasicrystal approximant (AC) GdCd6. Compositionally homogeneous single crystal samples Gd(Cd0.87Zn0.13(1))6 and Gd(Cd0.80Au0.20(1))6 were grown from melts Gd5(Cd0.8Zn0.2)100 and Gd1(Cd0.9Au0.1)100, respectively, and isolated by centrifugation. The M for Cd substitution in GdCd6 is accompanied with a sizeable reduction of the cubic unit cell parameter, from 15.514(2) Å to 15.329(1) Å (Zn) and 15.314(1) Å (Au). Site preferences were established from single crystal X‐ray diffraction data. A clear preference of atomic sites for Au and Zn is noted which is compared to earlier reported Yb(Cd0.75Mg0.25)6. Three and two out of in total seven crystallographic sites defining the Cd partial structure accept preferably metals more and less electronegative than Cd, respectively, and are classified as negatively and positively polarized sites in the binary 1/1 AC.

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Icosahedral quasicrystals and their cubic approximants in the Cd-Mg-RE (RE = Y, Sm, Gd, Tb, Dy, Ho, Er, Tm) systems

Cited by 12 publications

References 72 publications

2/1 and 1/1 cubic approximants in the ternary R-Cd-Mg (R = Y, Er) systems

2/1 and 1/1 cubic approximants in the ternary R-Cd-Mg (R = Y, Er) systems

Recent developments on fabrication of Al‐matrix composites reinforced with quasicrystals: From metastable to conventional processing

Chemical speciation in Gd−Cd−M (M=Zn, Au) quasicrystal approximants

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