The Crystal Structure of Pt8Al21.

Edshammar, Lars-Erik; Grønvold, Fredrik; Røst, Erling; Vestersjø, Egil; Stokke, O.; Bunnenberg, E.; Djerassi, Carl; Records, Ruth

doi:10.3891/acta.chem.scand.20-2683

Cited by 21 publications

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“…The stoichiometric Pt 8 Al 21 phase forming peritectically from PtAl 2 was confirmed by Edshammar [8] and Ellner et al [7] after the earlier reports by Huch and Klemm [3] and Guex and Feshotte [5] of a PtAl 3 -like phase. The structure of Pt 8 Al 21 has not been determined.…”

Section: Introductionsupporting

confidence: 56%

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Prins

Cornish

Boucher

2005

Journal of Alloys and Compounds

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Section: Introductionsupporting

confidence: 56%

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Prins

Cornish

Boucher

2005

Journal of Alloys and Compounds

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“…The interatomic Al−Al distances within those units range between 267 and 284 pm which is shorter than in fcc Al (286 pm) [51] but above the sum of covalent radii (2×125=250 pm) [37] . These distances are comparable to those found in other ternary aluminum rich platinides as the 3D monoclinic approximant of Eu 2 Pt 6 Al 15 (263–298 pm) [52] and Ce 2 Pt 6 Al 19 (273–315 pm) [53] or in binary Pt 8 Al 21 (262–300 pm) [54] …”

Section: Resultssupporting

confidence: 86%

Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed‐Valent Eu₂Ni₈Si₃ and Its Structural Anti‐Type Sr₂Pt₃Al₈

et al. 2021

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Eu2Ni8Si3 and its anti‐type representative Sr2Pt3Al8 were synthesized from the elements. They crystallize in the tetragonal crystal system with space group P42/nmc and with lattice parameters of a=997.9(1) and c=747.6(1) pm (Eu2Ni8Si3) as well as a=1082.9(2) and c=823.3(2) pm (Sr2Pt3Al8). Both compounds were investigated via single crystal X‐ray diffraction, indicating slight Si/Ni mixing for the silicide. Sr2Pt3Al8 exhibits a temperature independent magnetic susceptibility, suggesting superimposed dia‐ and Pauli‐paramagnetic contributions. The independent Al and Pt sites of the platinide were further characterized by 27Al and 195Pt solid‐state NMR spectroscopy, which were assigned with the help of electronic structure calculations. ICOHP calculations and Bader charges were used to analyze the bonding situation. Eu2Ni8Si3 in contrast is paramagnetic with a ferromagnetic transition at TC=46.9(2) K and exhibits an effective magnetic moment of μeff=6.61(1) μB per Eu atom. The latter is in line with an intermediate valence that was further proven by 151Eu Mößbauer spectroscopic investigations. At 300 K, the refined Eu2+/Eu3+ ratios are 60 %/40 %, at 78 K 62 % and 38 % (Eu2+/Eu3+) are observed, being in line with the ratio deduced from the magnetic susceptibility. Finally, at 6 K a ratio of 68 % Eu2+ and 32 % Eu3+ was observed. Below the Curie temperature, the Eu2+ signal shows a full magnetic hyperfine splitting, with an internal magnetic field value of B0=28.4 T.

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“…The monovalent cations are coordinated exclusively by halogen atoms and have the coordination number ten. The coordination polyhedron has the shape of an so-called Edshammar polyhedron [16], which consists of half an icosa- hedron capped with half a cube (Fig. 4).…”

Section: Crystal Structuresmentioning

confidence: 99%

On Oxohalogeno Niobates(V) M₂[Nb₃O₅X₇] (M = NH₄, K, Rb, Cs; X = Cl, Br) – New Members of a Compound Family with a Layered Structure

Beck

Bordinhão

Kusterer

2007

Zeitschrift anorg allge chemie

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The reaction of alkali chlorides MCl with NbOCl 3 yields melts which on cooling solidify under crystallization. In the case of KCl / NbOCl 3 , the pink coloured regulus was investigated by powder-XRD and shown to be biphasic, consisting of K[NbOCl 4 ] (primitive orthorhombic lattice, a ϭ 13.467(2); b ϭ 7.9362(8); c ϭ 14.041(2) Å ) and K 2 [NbOCl 5 ] (F centred cubic lattice, a ϭ 9.8291(2) Å ). To a small amount vapour phase transport occurs and colourless crystals of M 2 [Nb 3 O 5 Cl 7 ] (M ϭ K, Rb, Cs) are deposited in the colder parts of evacuated glass tubes containing molten mixtures of MCl and NbOCl 3 or MCl, Nb 2 O 5 and NbCl 5 in a temperature gradient of 500°C to 450°C for some days. Green crystals of (NH 4 ) 2 [Nb 3 O 5 Br 7 ] are obtained as a by-product in the reaction of NH 4 Br with NbOBr 3 in sealed ampoules at temperatures of 300°C. All compounds are isotypic and belong to the M 2 [Nb 3 O 5 X 7 ] structure type of which (NH 4 ) 2 [Nb 3 O 5 Cl 7 ] was already known (Schweda, 1997) (monoclinic, C2/c, Z ϭ 4,

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The Crystal Structure of Pt8Al21.

Cited by 21 publications

References 0 publications

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed‐Valent Eu₂Ni₈Si₃ and Its Structural Anti‐Type Sr₂Pt₃Al₈

On Oxohalogeno Niobates(V) M₂[Nb₃O₅X₇] (M = NH₄, K, Rb, Cs; X = Cl, Br) – New Members of a Compound Family with a Layered Structure

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The Crystal Structure of Pt8Al21.

Cited by 21 publications

References 0 publications

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Derivation of the liquidus surface projection for the Al–Pt–Ru system from as-cast samples

Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed‐Valent Eu2Ni8Si3 and Its Structural Anti‐Type Sr2Pt3Al8

On Oxohalogeno Niobates(V) M2[Nb3O5X7] (M = NH4, K, Rb, Cs; X = Cl, Br) – New Members of a Compound Family with a Layered Structure

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Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed‐Valent Eu₂Ni₈Si₃ and Its Structural Anti‐Type Sr₂Pt₃Al₈

On Oxohalogeno Niobates(V) M₂[Nb₃O₅X₇] (M = NH₄, K, Rb, Cs; X = Cl, Br) – New Members of a Compound Family with a Layered Structure