Crystal and quasicrystal structures in Cd?Yb and Cd?Ca binary alloys

Takakura, Hiroyuki; Guo, Junqing; Tsai, A.‐P.

doi:10.1080/09500830110044997

Cited by 79 publications

(53 citation statements)

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“…(a) X-ray powder diffraction patterns of the prepared Ag-In-RE samples. Calculated powder diffraction pattern for Cd 6 Yb 1/1 approximant phase is also given for comparison [15]. Nominal compositions are shown on the right side.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…These 1/1 approximants are considered as isostructural to the well-known Cd 6 Yb approximant [13,14,15,16], which is a bcc crystal of the space group Im3 with icosahedral clusters of RE elements and forms the same local structure as the stable binary icosahedral quasicrystal Cd 5.7 Yb [17,18,19]. This is the first discovery of the approximant phase which contains magnetic rare-earth elements and doesn't contain neutron-absorbing elements such as Cd.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of the Ag–In–rare-earth 1/1 approximants

Ibuka¹,

Iida²,

Sato³

2011

J. Phys.: Condens. Matter

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Abstract. We have performed magnetic susceptibility and neutron scattering measurements on polycrystalline Ag-In-RE (RE: rare-earth) 1/1 approximants. In the magnetic susceptibility measurements, for most of the RE elements, inverse susceptibility shows linear behaviour in a wide temperature range, confirming well localized isotropic moments for the RE 3+ ions. Exceptionally for the light RE elements, such as Ce and Pr, non-linear behaviour was observed, possibly due to significant crystalline field splitting or valence fluctuation. For RE = Tb, the susceptibility measurement clearly shows a bifurcation of the field-cooled and zero-field-cooled susceptibility at T f = 3.7 K, suggesting a spin-glass-like freezing. On the other hand, neutron scattering measurements detect significant development of short-range antiferromagnetic spin correlations in elastic channel, which accompanied by a broad peak athω = 4 meV in inelastic scattering spectrum. These features have striking similarity to those in the Zn-Mg-Tb quasicrystals, suggesting that the short-range spin freezing behaviour is due to local high symmetry clusters commonly seen in both the systems.

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Section: Sample Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic properties of the Ag–In–rare-earth 1/1 approximants

Ibuka¹,

Iida²,

Sato³

2011

J. Phys.: Condens. Matter

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“…The unique structural feature of the Tsai-type i-phases is the existence of the tetrahedron consisting of four atoms located at the icosahedral cluster center, which breaks icosahedral symmetry in the phases. 5,6) Moreover, Tsai-type i-phases have been found to form in a variety of ternary or quaternary alloys: AgIn-(Ca, Yb), 9) Au-In-Ca, 10) Zn-Mg-Sc, 11) Zn-(Ag, Au, Pd, Pt)-Sc, 12) Zn-Cu-Sc, 13) Zn-(Mn, Fe, Co, Ni)-Sc, 14) Cu-GaMg-Sc 15) and Cu-(Ga, Al)-Sc. 16) Consequently, the Tsai-type i-phases constitute the largest of the three groups of i-phases.…”

Section: Introductionmentioning

confidence: 99%

“…There are three types of atomic clusters known so far: Mackay-type, Bergman-type and Tsai-type. [3][4][5] The i-phases can be classified into three groups in terms of the above cluster type.…”

Section: Introductionmentioning

confidence: 99%

Formation of Icosahedral Quasicrystals and 1/1 Crystal Approximants in Al-Pd-RE (RE: Rare Earth Metals) Systems

Yoshikawa

Saruhashi

et al. 2011

Mater. Trans.

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We have investigated the formation of an icosahedral quasicrystal (i-phase) and its 1/1-crystal approximant (1/1-phase) in the (Al, Ga)-Pd-RE (Rare earth metals) systems. Consequently, the Ga-Pd-Sc 1/1-phase, the Al-Pd-RE (RE = Yb, Tm and Er) 1/1-phase and the Al-Pd-Yb i-phase have been newly found by the substitution of Al for Ga, or Sc for other RE in the constituent elements of the Al 54 Pd 30 Sc 16 i-phase previously reported. For the i-and the 1/1-phases studied in this work, the number of valence electrons per atom (e=a) ratio is 2.10 and the atomic radius ratio of the rare earth element to that of the other base elements is in the range 1.15-1.24, which fulfilled the formation conditions previously reported for other Tsai-type i-phases. On the other hand, the stability of the i-phases becomes lower with increasing the atomic radii of the RE elements, which indicates that the atomic radius ratio plays important role in the formation of the Al-Pd-RE i-and 1/1-phases.

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“…In most cases, such an atomic cluster is identical to the cluster found in the corresponding crystal approximant phases in the same alloy system. There are three types of clusters known so far: [2][3][4][5] Mackay-type, Bergman-type and Tsai-type. The i-phases found so far can be classified into the three groups in terms of the cluster type.…”

Section: Introductionmentioning

confidence: 99%

Formation of Icosahedral Quasicrystal and Its 1/1 Crystal Approximant in Al-Pd-Sc System

Edagawa

2009

Mater. Trans.

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An icosahedral quasicrystal (i-phase) and its 1/1 crystal approximant (1/1-phase) have been found to form in Al-Pd-Sc system. The formation areas of the i-phase and the 1/1-phase are limited to very small areas around the compositions of Al 54 Pd 30 Sc 16 and Al 56 Pd 29 Sc 15 , respectively. The valence electrons per atom ratio (e/a ratio) is calculated to be 2.10 for the i-phase of Al 54 Pd 30 Sc 16 . The 16 at% Sc concentration and e=a ¼ 2:10, as well as the intensity profile of the measured X-ray diffraction spectrum, indicate that this i-phase can be classified into the Tsai-type: the Tsai-type i-phases found so far commonly contain an element having relatively large atomic size with 15-16 at% and have e/a within the range 2.0-2.15. The formation of the i-phase has also been found in a series of quaternary Al-Pd-Cu-Sc alloys with different compositions keeping 16 at%Sc and e=a ¼ 2:10. This supports the fact that the two conditions are crucially important in the formation of this type of i-phase.

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Crystal and quasicrystal structures in Cd?Yb and Cd?Ca binary alloys

Cited by 79 publications

References 0 publications

Magnetic properties of the Ag–In–rare-earth 1/1 approximants

Magnetic properties of the Ag–In–rare-earth 1/1 approximants

Formation of Icosahedral Quasicrystals and 1/1 Crystal Approximants in Al-Pd-RE (RE: Rare Earth Metals) Systems

Formation of Icosahedral Quasicrystal and Its 1/1 Crystal Approximant in Al-Pd-Sc System

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