AuTa5S: A Cubic Rod Packing of Condensed (Au, Ta)13Icosahedra Interwoven with a Three-Dimensional Framework of Corner-Connected STa6Octahedra

Harbrecht, Bernd; Wagner, Volker; Pietzonka, Clemens

doi:10.1006/jssc.1998.7799

Cited by 7 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In these structures a number of octahedral voids exist, among which those corresponding to 16d and 16e positions. Inclusion variants of the Ti 2 Ni and Gd 4 RhIn types are W 3 Fe 3 C [23] and AuSTa 5 [24], respectively, where carbon and sulfur atoms occupy the 16d and 16e sites. The group-subgroup relations for the latter structures (also shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Crystal chemical peculiarities of rare earth (R) rich magnesium intermetallic compounds in R–T–Mg (T = transition element) systems

Solokha¹,

Negri²,

Pavlyuk³

et al. 2009

Chem. Met. Alloys

View full text Add to dashboard Cite

Er) were synthesized by slow thermal treatment in a resistance furnace, starting from element pieces enclosed in sealed Ta crucibles. SEM-EDXS analyses were performed for monitoring the phase composition. The crystal structures of the majority of these intermetallics were investigated by X-ray diffraction on single crystals. The R 23 Ni 7 Mg 4 compounds crystallize in the Pr 23 Ir 7 Mg 4 structure type: P6 3 mc, hP68, Z = 2, for Ce a = 0.99742(1), c = 2.25206(4) nm, wR 2 = 0.0686, 1483 F 2 values, 74 variables; for Pr a = 0.99249(4), c = 2.24460(9) nm, wR 2 = 0.0735, 1395 F 2 values, 74 variables; for La a = 1.01234(8), c = 2.2887(2) nm, R B = 7.3% and R F = 5.1%. The series of isostructural R 4 NiMg compounds belongs to the Gd 4 RhIn structure type, F4 3m, cF96, Z = 16. Crystal chemical relations of R 23 Ni 7 Mg 4 with other rare earth rich intermetallics are discussed. The cubic R 4 NiMg structures are described in terms of nested polyhedra units and relations with some other cubic structures are shown on the basis of group-subgroup relations. Crystal structure / Group-subgroup relation / Mg-containing alloys

show abstract

Section: Resultsmentioning

confidence: 99%

Crystal chemical peculiarities of rare earth (R) rich magnesium intermetallic compounds in R–T–Mg (T = transition element) systems

Solokha¹,

Negri²,

Pavlyuk³

et al. 2009

Chem. Met. Alloys

View full text Add to dashboard Cite

show abstract

“…Von den 31 kristallographisch ungleichen Atomen belegen Ta(3) bis Ta (19), Te(1) bis Te(9) und S(1) bis S(3) die allgemeine Punktlage 2 i der Raum-gruppe P1. Ta(1) und Ta (2) befinden sich in Inversionszentren, in der gewa È hlten Aufstellung in 1 / 2 1 / 2 1 / 2 und 1 / 2 1 / 2 0.…”

Section: Ergebnisse Und Diskussionunclassified

“…Sie sind einseitig von drei, vier, fu È nf oder sechs Metallatomen koordiniert. Nur Ta (19) ragt soweit aus der Schicht heraus, daû noch bindender Kontakt zu Te(6) (293.8 pm) aus dem benachbarten Schichtpaket mo È glich wird. Die Te±Te-Absta È nde innerhalb und zwischen den Schichten (³ 352 pm) sind vergleichbar mit denen in TaTe 2 (³ 356 pm [36]).…”

Section: Ergebnisse Und Diskussionunclassified

See 1 more Smart Citation

Die metallreiche Schichtstruktur von Ta6STe3

Debus

Harbrecht

2000

Z. anorg. allg. Chem.

View full text Add to dashboard Cite

Ta11Si2Se8 – Condensed Tetrakaidecahedral Ta9Si Clusters Arranged to an Open Network Structure

Mrotzek

Harbrecht²

1999

Eur. J. Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Ta11Si2Se8 was synthesized from a pre‐reacted mixture of the elements in a sealed tantalum tube at 1570 K. Mo‐doped crystals were obtained in a welded molybdenum crucible by a chemical transport reaction using TeI4 as a transport agent. The structure of Mo0.11Ta10.89(2)Si2Se8 has been determined by single crystal X‐ray means [Pnnm, Z = 2, a = 1184.4(1) pm, b = 1939.4(1) pm, c = 346.48(2) pm, wR2 = 0.069]. The structure of the ternary phase was verified by means of a Rietveld profile fit of a powder X‐ray diffractogram. The silicide is isotypic with Ta11Ni2Se8. The structure is composed of Si‐centred, tricapped trigonal prismatic Ta9Si clusters. The tetrakaidecahedral Ta9Si clusters are fused into twin chains by sharing the Tapr atoms of facing triangulated prism faces and one out of three capping atoms Tac. Intercluster linkage of the remaining Tac atoms generates a microporous ∞3[SiTa2cTa1/2cTa6/2pr] substructure. The channels of the metal network are sheathed by three‐, four‐, five‐, and sixfold coordinated Se atoms. Four‐probe dc resistivity measurements revealed the Mo‐doped phase to be a moderate metallic conductor. The bonding interactions contributing to the stability of Ta11Si2Se8 and distinctions in bonding for Ta11Si2Se8 and Ta11Ni2Se8 are analysed on the basis of semi‐empirical extended Hückel calculations.

show abstract

AuTa5S: A Cubic Rod Packing of Condensed (Au, Ta)13Icosahedra Interwoven with a Three-Dimensional Framework of Corner-Connected STa6Octahedra

Cited by 7 publications

References 25 publications

Crystal chemical peculiarities of rare earth (R) rich magnesium intermetallic compounds in R–T–Mg (T = transition element) systems

Crystal chemical peculiarities of rare earth (R) rich magnesium intermetallic compounds in R–T–Mg (T = transition element) systems

Die metallreiche Schichtstruktur von Ta6STe3

Ta11Si2Se8 – Condensed Tetrakaidecahedral Ta9Si Clusters Arranged to an Open Network Structure

Contact Info

Product

Resources

About