Revisiting Ce3Pt4Ge6– crystal structure and physical properties

Janka, Oliver; Hoffmann, Rolf‐Dieter; Eilers‐Rethwisch, Matthias; Rodewald, Ute Ch.; Niehaus, Oliver; Pöttgen, Rainer

doi:10.1039/c6qi00248j

Cited by 7 publications

(5 citation statements)

References 37 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Utilizing the same flux method, single crystals of Pt 4 Sn 6 R 3 were grown for R = La, Ce, Pr, and Nd, all of which adopt the reported Pt 4 Ge 6 Pr 3 type. However, note that an alternative description model in a (3 + 1)D superspace group has been recently proposed for Pt 4 Ge 6 Ce 3 that is representative of the same Pt 4 Ge 6 Pr 3 structure type. Although the same model might be applied to other Ge and Sn representatives, the initial structural description in the Pnma space group can be considered as a commensurately modulated three-dimensional (3D) approximant.…”

Section: Resultsmentioning

confidence: 99%

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

et al. 2020

View full text Add to dashboard Cite

Starting generally with a 4:6:3 molar ratio of Pt, Sn, and R (where R = La–Sm), with or without the application of a NaCl flux, seven ternary compounds were obtained as single crystals. The platinides Pt4Sn6R3 (R = La–Nd) crystallize with the Pt4Ge6Pr3 type of structure (oP52, Pnma, a = 27.6–27.8 Å, b = 4.59–4.64 Å, c = 9.33–9.40 Å). With R = Pr, Pt4Sn6Pr3–x (oP52, Pnma, a = 7.2863(3) Å, b = 4.4909(2) Å, c = 35.114(1) Å) is also obtained, which might be considered a high-temperature polymorph with disorder on the Sn- and Pr-sites. For R = Nd and Sm, a structurally related isostructural series with a slightly different composition Pt3Sn5 R 2–x (oP52, Cmc21, a = 4.50–4.51 Å, b = 26.14–26.30 Å, c ≈ 7.29 Å) has been observed, together with Pt7Sn9Sm5 (oS42, Amm2, a = 4.3289(5) Å, b = 28.798(4) Å, c = 7.2534(9) Å) under the same conditions. The latter exhibits the rare Zr5Pd9P7-type structure, linking polar intermetallics to metal phosphides, in accord with P7Pd9Zr5Pt7Sn9Sm5. All structures may be described in terms of either negative Pt/Sn networks encapsulating positive R atoms, or {PtSn x } clusters (x = 5, 6, or rarely 7) sharing vertices and edges with R in the second coordination sphere and with considerable heterometallic Pt–R bonding contributions.

show abstract

Section: Resultsmentioning

confidence: 99%

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The difference in molar volumes, 56.99 ( 3 ) and 59.35 cm 3 /mol ( 4 ), of 2.36 cm 3 /mol corresponds well with one-third of the volume of a Pt atom, 3.03 cm 3 /mol. In Pt 4 Sn 6 Nd 3 , which crystallizes as Pt 4 Sn 6 R 3 (R = La, Ce, Pr) 10 with the Pt 4 Ge 6 Pr 3 type of structure, 32 , 33 all three crystallographically independent Pt atoms form {PtSn 5 } clusters, see Figure 5 , with an average Pt–Sn distance of 2.658 (1) Å, nearly the same as in PtSn 2 Nd, 2.680 (1) Å. There are five additional Nd atoms surrounding each Pt such that a {PtSn 5 Nd 5 } heteroatomic cluster of two interpenetrating antiparallel square pyramids occurs ( Figure 5 ), an architecture that we have already seen for all of the stuffed Sn 2 Nd derivatives ( 1 ), ( 2 ), and ( 3 ).…”

Section: Resultsmentioning

confidence: 99%

The Prolific Ternary System Pt/Sn/Nd: Insertion of Pt into the Structures of Sn/Nd Intermetallics Yields Structural Complexity and Wealth

et al. 2023

View full text Add to dashboard Cite

The understanding of structure and bonding in intermetallic phases still lags behind that of molecular compounds. For that reason, exploring intermetallic phases and identifying structural patterns and relationships are particularly important for closing this knowledge gap. In particular, here we report on the addition of increasing amounts of platinum to ∼2:1 mixtures of tin and neodymium, which yields eight ternary Pt/Sn/Nd compounds, four of which have not been reported before. Interestingly, except for PtSnNd (1), all observed ternary phases of the system can be derived from the binary compounds Sn2Nd and Sn5Nd2 by adding Pt to the composition(s), as they lie on or close to two lines: Sn2Nd–Pt (Pt0.21(1)Sn2Nd (2), PtSn2Nd (3), Pt1.33Sn2Nd (4), Pt2–x Sn2+x Nd (x = 0.27(3), 5), and Pt3Sn2Nd (6)) or Sn5Nd2–Pt (Pt1.5Sn5–x Nd2 (x = 0.16(2), 7) and Pt3Sn5Nd2–x (x = 0.161(8), 8)). While the introduction of increasing amounts of Pt to the binaries Sn2Nd and Sn5Nd2 leads to stepwise changes in the coordination environment of Nd, Pt preserves its coordination over the entire system in the form of interpenetrating bipyramidal {PtSn5Nd5} clusters.

show abstract

“…Finally, we can (geometrically) classify the EuPtSn 2 structure into a larger family of intermetallic compounds, based on the pentagonal and hexagonal prismatic coordination of the europium atoms. In Figure we present a projection of the EuPtSn 2 structure along the short unit cell axis together with the structures of DyRhGe 2 and Ce 3 Pt 4 Ge 6 . The three structures show the common building block of rows of condensed hexagonal prisms.…”

Section: Resultsmentioning

confidence: 99%

“…EuPtSn 2 structure along the short unit cell axis together with the structures of DyRhGe 2 [38] and Ce 3 Pt 4 Ge 6 . [39] The three structures show the common building block of rows of condensed hexagonal prisms. The difference concerns the condensation of the hexagonal prisms with the pentagonal ones.…”

Section: Articlementioning

confidence: 99%

EuPtSn₂ – A Stannide with Sn₂ Dumbbells in a Three‐dimensional [PtSn₂]^2– Polyanion

Klenner

Stegemann

Pöttgen

2019

Zeitschrift anorg allge chemie

Self Cite

View full text Add to dashboard Cite

EuPtSn2 was obtained by melting of the elements in a sealed tantalum ampoule followed by an annealing sequence for crystal growth. The EuPtSn2 sample was studied through its Guinier powder pattern and the structure was refined from single‐crystal X‐ray diffractometer data: CeRhSn2 type, Cmcm, a = 472.05(3), b = 1724.19(12), c = 957.36(7) pm, wR2 = 0.0388, 879 F2 values and 30 variables. The platinum and tin atoms build up a three‐dimensional [PtSn2]2– polyanionic network which consists of distorted PtSn5 square pyramids (265–278 pm Pt–Sn) and Sn2 dumbbells with 281 and 299 pm Sn–Sn distances. The structural relationship with DyRhGe2 and Ce3Pt4Ge6 is discussed. EuPtSn2 shows Curie–Weiss behavior with an experimental magnetic moment of 7.78(1) μB / Eu, indicating stable divalent europium. This is corroborated by 151Eu Mössbauer spectroscopy. Antiferromagnetic ordering is detected below 3.4 K. Specific heat measurements confirm the magnetic ordering and indicate a second phase transition through a clear λ‐type signal at 7.3 K which might be associated with a structural distortion.

show abstract

Revisiting Ce₃Pt₄Ge₆– crystal structure and physical properties

Abstract: Structural reinvestigations of Ce3Pt4Ge6revealed additional reflections justifying the orthorhombic (3 + 1)D superspace groupCmcm(α,0,0)0s0 withα= 0.5a*.

Cited by 7 publications

References 37 publications

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

The Prolific Ternary System Pt/Sn/Nd: Insertion of Pt into the Structures of Sn/Nd Intermetallics Yields Structural Complexity and Wealth

EuPtSn₂ – A Stannide with Sn₂ Dumbbells in a Three‐dimensional [PtSn₂]^2– Polyanion

Contact Info

Product

Resources

About

Revisiting Ce3Pt4Ge6– crystal structure and physical properties

Abstract: Structural reinvestigations of Ce3Pt4Ge6revealed additional reflections justifying the orthorhombic (3 + 1)D superspace groupCmcm(α,0,0)0s0 withα= 0.5a*.

Cited by 7 publications

References 37 publications

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

Ternary Polar Intermetallics within the Pt/Sn/R Systems (R = La–Sm): Stannides or Platinides?

The Prolific Ternary System Pt/Sn/Nd: Insertion of Pt into the Structures of Sn/Nd Intermetallics Yields Structural Complexity and Wealth

EuPtSn2 – A Stannide with Sn2 Dumbbells in a Three‐dimensional [PtSn2]2– Polyanion

Contact Info

Product

Resources

About

Revisiting Ce₃Pt₄Ge₆– crystal structure and physical properties

EuPtSn₂ – A Stannide with Sn₂ Dumbbells in a Three‐dimensional [PtSn₂]^2– Polyanion