Zn1−xPdx(x=0.14–0.24): a missing link between intergrowth compounds and quasicrystal approximants

Gourdon, Olivier; Izaola, Zunbeltz; Elcoro, Luis; Petřı́ček, V.; Miller, Gordon J.

doi:10.1080/14786430500254701

Cited by 28 publications

(27 citation statements)

References 10 publications

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“…Only little is known about the lowtemperature phase ZnPd 2 (RT), its range of existence was mostly determined according to two-phase samples [45] . Due to the large amount of different (line) phases existing in the range of Zn = 75-79 at.-%, a final picture of the temperature region above 1023 K including the liquidus line has not been concluded yet [46][47][48][49] . The phase borders of the tetragonal ZnPd phase reveal a large expansion towards Pd-richer compositions (max.…”

Section: The Intermetallic Compound Znpdmentioning

confidence: 99%

“…Up to now it is unknown, how non-equimolar compositions are realized by the crystal structure, i.e., if interstitial sites are occupied, if the majority component replaces the minority component or if the homogeneity range is realized by defects. ,  [54] ,  [45] ,  [40;52] ,  [55] ,  [46] and  [47][48][49] .…”

Section: The Intermetallic Compound Znpdmentioning

confidence: 99%

See 1 more Smart Citation

The Intermetallic Compound ZnPd and Its Role in Methanol Steam Reforming

Armbrüster¹,

Behrens²,

Föttinger³

et al. 2013

Catalysis Reviews

111

139

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The rich literature about the intermetallic compound ZnPd as well as several ZnPd near-surface intermetallic phases is reviewed. ZnPd is frequently observed in different catalytic reactions triggering this review in order to collect the knowledge about the compound. The review addresses the chemical and physical properties of the compound and relates these comprehensively to the catalytic properties of ZnPd in methanol steam reformingan interesting reaction to release hydrogen for a future hydrogen-based energy infrastructure from water/methanol mixtures. The broad scope of the review covers experimental work as well as quantum chemical calculations on a variety of Pd-Zn materials, aiming at covering all relevant literature to derive a sound state-of-the-art picture of the understanding gained so far

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Section: The Intermetallic Compound Znpdmentioning

confidence: 99%

Section: The Intermetallic Compound Znpdmentioning

confidence: 99%

The Intermetallic Compound ZnPd and Its Role in Methanol Steam Reforming

Armbrüster¹,

Behrens²,

Föttinger³

et al. 2013

Catalysis Reviews

111

139

View full text Add to dashboard Cite

show abstract

“…Recent investigations in the Pt−Zn and Pd−Cd systems have elucidated some crystal structures that can help explain these observations. − In all cases, the direction of the superstructure is parallel with [110] for the cubic γ-brass structure, along which are found chains of icosahedra. Therefore, along this direction, 1D quasiperiodicity could exist and these IAPD structures can be explained by intergrowths of cluster units within these chains …”

Section: Introductionmentioning

confidence: 98%

Intergrowth Compounds in the Zn-Rich Zn−Pd System: Toward 1D Quasicrystal Approximants

Gourdon

Miller

2006

Chem. Mater.

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A series of γ-brass related structures in the Zn-rich portion of the Zn−Pd phase diagram (ca. 80 at % Zn) is investigated using single-crystal diffraction and tight-binding electronic-structure calculations. Earlier research identified regular arrays of inversion antiphase domains (IAPDs) over a narrow composition range but did not report any characteristic superstructure(s) over the same range. Single-crystal X-ray diffraction allowed for the identification of lattice constants for six "phases" in Zn 1-x Pd x (0.15 < x < 0.25), and refinements of two crystal structures indicate two important potential building blocks for the intermediate compositions, one of these being the cubic γ-brass structure. A Farey tree construction is described that accounts for the observed longperiod superlattice and provides a possible algorithm for targeting one-dimensional, quasiperiodic phases in this and related systems. Tight-binding electronic-structure calculations on the two limiting structures for this region of the Zn−Pd phase diagram suggest a relationship between structure and bonding in these complex intermetallic systems. Disciplines

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“…[17] However, these binary phase spaces in the vicinity of the g-brass region accommodate several structurally complex phases depending on reaction conditions as well as the specific binary system. [14,[18][19][20][21] Structural investigations of some of these phases suggest that their structures have close relationships with various quasi-crystals, because the {110} directions of the cubic g-brass structure are parallel to the 5-fold axis of icosahedral phases or the 10-fold axis of decagonal phases. [22][23][24] Among the complex crystalline phases, the structure most closely related to g-brass is a 2 2 2 superstructure (space group F4 3m, Pearson symbol cF416), which we abbreviate as g'-brass.…”

Section: Introductionmentioning

confidence: 99%

“…This work is motivated by the discovery of complex, γ‐brass related structures for Pd 2+ x Zn 11− x with Zn concentrations ranging from approximately 75 to 85 atomic percent. The phase richest in Zn adopts the cubic γ‐brass structure, but as the Pd concentration increases, these phases show extraordinary periodicities along a single direction that provide approximants to potentially one‐dimensional quasi‐periodic structures;14, 20 similar behavior occurs in the NiZn and PtZn systems 19. 37 Recently, some of these complex structures were solved by using super space group (3+1D) strategies 37.…”

Section: Introductionmentioning

confidence: 99%