Production of quasicrystals and crystalline approximants in the Al–Pd–(Fe,Ru,Os) systems

Shibuya, Tadaharu; Asao, Takayuki; Tamura, M.; Tamura, Ryuji; Takeuchi, Shin

doi:10.1016/s0921-5093(00)01199-0

Cited by 19 publications

(23 citation statements)

References 12 publications

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“…As already mentioned, the X-ray powder diffraction pattern of i-AlPdFe shows a particularly strong (7,11) superstructure reflection as compared with the nearby fundamental reflections ð6; 9Þ and ð8; 12Þ. This is in favor of the average number of electrons generated by the atomic surface n to be as much different as possible from the one generated by the atomic surface n trons of the atomic surfaces n and n 0 is rather small as the intensity of the (7,11) reflection) and Al 70:36 Pd 21:35 Fe 8:29 .…”

Section: Atomic Modellingsupporting

confidence: 52%

“…An interesting point to notice here, is the fact that the composition Al 71 Pd 18 Fe 11 presented in [11] can be obtained from our composition Al 70:36 Pd 21:35 Fe 8:29 by substituting Pd to Fe on the bc atomic surface (whatever model 1 or 2). In fact, a progressive substitution of Pd by Fe on the bc allows to cover the entire existence domain of the i-phase in the ternary phase diagram (see [11]).…”

Section: Atomic Modellingmentioning

confidence: 92%

“…The structural models for the two icosahedral phases as- The Al-Pd-Fe system has been previously studied by T. Shibuya et al [11] C to 750 C: the F-type icosahedral phase seems to be the stable phase for that composition.…”

Section: Atomic Modellingmentioning

confidence: 99%

“…Actually, the situation is a little more complex for this latter case in view of the results of T. Shibuya al. [11]. They showed that the intensity of the (7,11) reflection becomes weaker and weaker when substituting Fe to Ru and Os.…”

Section: Atomic Modellingmentioning

confidence: 99%

“…In fact, a progressive substitution of Pd by Fe on the bc allows to cover the entire existence domain of the i-phase in the ternary phase diagram (see [11]). This substitution does not change the average number of electrons generated by the atomic surfaces n and n 0 and therefore does not change the intensity of the (7,11) …”

Section: Atomic Modellingmentioning

confidence: 99%

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Study of quasicrystals obtained from a structural model of icosahedral phases of type F AlPdMn/AlCuFe

Beauchesne¹,

Caillard²,

Mompiou³

et al. 2009

Zeitschrift Für Kristallographie

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have been prepared by rapid quenching and annealing and studied by X-ray diffraction and electron microscopy. All three phases are quasicrystalline after quench: Al 66:08 Cu 21:35 Mn 12:57 is decagonal, and the two others are F-icosahedral phases. After annealing, the quaternary alloy transforms into a decagonal phase. The present results are compared to those of previous studies in the litterature of samples with close compositions.

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Section: Atomic Modellingsupporting

confidence: 52%

Section: Atomic Modellingmentioning

confidence: 92%

Section: Atomic Modellingmentioning

confidence: 99%

Section: Atomic Modellingmentioning

confidence: 99%

Section: Atomic Modellingmentioning

confidence: 99%

See 3 more Smart Citations

Study of quasicrystals obtained from a structural model of icosahedral phases of type F AlPdMn/AlCuFe

Beauchesne¹,

Caillard²,

Mompiou³

et al. 2009

Zeitschrift Für Kristallographie

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A New Rhombic Approximant in the Al - Pd - Fe System

Balanetskii

Grushko

Urban

et al. 2005

Powder Metall Met Ceram

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Scanning and transmission electron microscopy have been used along with x-ray diffraction in the Al − Pd − Fe system to establish a new type of B-centered rhombic N phase. The lattice constants of the N phase are as follows: a = 2.31 nm, b = 1.60 nm, and c = 4.70 nm. Electron-probe microanalysis establishes the composition: Al 76.6 Pd 10.0 Fe 13.4 . Differential thermal analysis indicates that the N phase melts incongruently at a temperature close to 885°C.The Al − Pd − Fe system belongs to the class of so-called quasicrystal-forming systems based on aluminum and transition metals, which have been the subject of extensive research in the last two decades. The reason was the discovery in 1984 by Shechtman [1] of a new class of solids that were called quasicrystals, as they have symmetry forbidden by classical crystallography.In the early works [2, p. 16; 3], which were concerned with the Al − Pd − Fe system in the region of Al contents from 50 to 100 at.% at 500°C, no stable ternary phase was found. At approximately the same time, a communication appeared on the formation of a stable decagonal phase (type D 4 , periodicity close to 1.6 nm), one-dimensional quasiperiodic phases (with the same periodicity along the tenfold pseudoaxis), and a monoclinic phase (a ≈ b ≈ 2.0 nm, c ≈ 1.6 nm, α ≈ 108°) in the region of compositions from 10 to 15 at.% Pd with a constant content of close to 75 at.% of aluminum, in addition to a cubic phase (a ≈ 2.05 nm) which is formed by decomposition of the metastable icosahedral phase of composition Al 70 Pd 10 Fe 20 [4].In this connection, the Al − Pd − Fe system was reexamined [5] in the region of aluminum contents from 50 to 100 at.% and iron up to 30 at.% at 900 and 750°C. It was found that three ternary cubic phases are formed: C′( 3 Pm , a = = 0.7654 nm), C 1 (P23, a ≈ 1.55 nm), and C 2 ( 3 Fm , a ≈ 1.5515 nm) as approximants of the icosahedral phase, as well as two ternary rhombic compounds: O 1 (B, a ≈ 2.3 nm, b ≈ 1.7 nm, c ≈ 3.2 nm) and O 2 (B, a ≈ 2.3 nm, b ≈ 1.7 nm, c ≈ ≈ 4.5 nm): ε 16 and ε 22 , in our symbols, which are approximants for the D 4 phase. The homogeneity region for the C′ phase was not established. None of the phases reported in [4] was found.In [6], there was reported a previously unknown rhombic phase O-Al 13 (Fe, Pd) 4 (Cmcb, a = 1.5473 nm, b = = 0.8132 nm, c = 2.3869 nm), whose structure is closely related to the binary monoclinic M-Al 13 Fe 4 (C2/m, a = = 1.5483 nm, b = 0.8079 nm, c = 1.2509 nm, and β = 108.11°) [7]; the structures of these two phases are related to that of the decagonal D 2 phase (periodicity close to 0.8 nm along the tenfold axis), since they can be described by the use of identical structure elements but differently disposed, namely two types of colonial pentagonal atomic clusters [6].

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Formation of quasiperiodic and related periodic intermetallics in alloy systems of aluminum with transition metals

Grushko

Velikanova

2007

Calphad

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Production of quasicrystals and crystalline approximants in the Al–Pd–(Fe,Ru,Os) systems

Cited by 19 publications

References 12 publications

Study of quasicrystals obtained from a structural model of icosahedral phases of type F AlPdMn/AlCuFe

Study of quasicrystals obtained from a structural model of icosahedral phases of type F AlPdMn/AlCuFe

A New Rhombic Approximant in the Al - Pd - Fe System

Formation of quasiperiodic and related periodic intermetallics in alloy systems of aluminum with transition metals

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