Home Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
Article
Licensed
Unlicensed Requires Authentication

Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type

  • Michael Wagener , Hans-Jörg Deiseroth and Christof Reiner
Published/Copyright: September 25, 2009
Become an author with De Gruyter Brill
Submit Manuscript Author Information
Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 221 Issue 5-7

Abstract

The two new deeply coloured, air stable, isotypic compounds Ag6GeS4X2 (X: Cl, Br) were obtained in the course of a series of experiments to prepare new “non-metallic filled Laves phases (= argyrodites)”. Although the chemical compositions of the new compounds are in accordance with the desired rare type of doubly halide (X) substituted argyrodites Ag6GeS4X2, their crystal structures are not of the argyrodite type. Instead they are the first members of the new family of “non-metallic filled NaHg2 phases”, i.e. the partial structure of the non-metal atoms S and X (Cl, Br) corresponds to the arrangement of Na and Hg atoms in NaHg2 (= X2S4) with Ge located in tetrahedral holes exclusively and Ag located in tetrahedral as well as octahedral holes. The lattice constants of the new phases are (both space group Pnma, Z = 4): Ag6GeS4Cl2 (a = 643.0(1) pm, b = 761.0(2) pm, c = 2266.0(5) pm), Ag6GeS4Br2 (a = 654.0(1) pm, b = 772.7(2) pm, c = 2289.9(5) pm). High temperature X-ray powder studies show an irreversible loss of halogen resulting in inhomogeneous decomposition products with argyrodite structure.

Keywords: Argyrodite; Laves phase; Topological close packing; Phase transition; Single crystal structure analysis; X-ray diffraction
:
Published Online: 2009-9-25
Published in Print: 2006-5-1

© by Oldenbourg Wissenschaftsverlag, München

Articles in the same Issue

  1. Editorial: Crystal Chemistry of Intermetallic Compounds
  2. Fritz H. Laves – 100 years young
  3. Fritz H. Laves – an ideal for generations
  4. Gustav E. R. Schulze's pioneering work on Laves phases
  5. Preparation, phase stability and structure of the C36 Laves phase Nb1–xCo2+x
  6. Atom order and thermodynamic properties of the ternary Laves phase Ti(TiyNixAl1–x–y)2
  7. Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)
  8. Microscopic structures of Laves phases and structurally related compounds: a transmission electron microscopy study
  9. Binary rare earth Laves phases — an overview
  10. Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
  11. Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
  12. Reflections on symmetry and formation of axial quasicrystals
  13. Mosaic-like tilings derivated from o-Co4Al13 and m-Co4Al13 crystal structures
  14. High-pressure crystal chemistry of binary intermetallic compounds
  15. Re3B type intermetallics — crystal chemistry, bonding and properties
  16. Ti2Rh6B – a new boride with a double perovskite-like structure containing octahedral Rh6 clusters
  17. On the formation and crystal structure of the Pd6B phase
  18. Crystal growth and magnetic properties of rare earth borosilicides
  19. The effect of transition metal doping on thermal conductivity of YB66
  20. Structure refinements of iron borides Fe2B and FeB
  21. Cubic structure types of rare-earth intermetallics and related compounds
  22. Structural variations in Gd5Si4-xSnx: size vs. electronic effects
  23. Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
  24. Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
  25. Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
  26. Ge40.0Te5.3I8: synthesis, crystal structure, and properties of a new clathrate-I compound
  27. Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
  28. Low- and high-temperature structures of YbCuBi
  29. (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
  30. Geometric variations and electron localizations in intermetallics: PbFCl type compounds
  31. A novel series of sphere packings with arbitrarily low density
  32. Books Received
https://doi.org/10.1524/zkri.2006.221.5-7.533
Keywords for this article
Argyrodite; Laves phase; Topological close packing; Phase transition; Single crystal structure analysis; X-ray diffraction

Articles in the same Issue

  1. Editorial: Crystal Chemistry of Intermetallic Compounds
  2. Fritz H. Laves – 100 years young
  3. Fritz H. Laves – an ideal for generations
  4. Gustav E. R. Schulze's pioneering work on Laves phases
  5. Preparation, phase stability and structure of the C36 Laves phase Nb1–xCo2+x
  6. Atom order and thermodynamic properties of the ternary Laves phase Ti(TiyNixAl1–x–y)2
  7. Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)
  8. Microscopic structures of Laves phases and structurally related compounds: a transmission electron microscopy study
  9. Binary rare earth Laves phases — an overview
  10. Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
  11. Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
  12. Reflections on symmetry and formation of axial quasicrystals
  13. Mosaic-like tilings derivated from o-Co4Al13 and m-Co4Al13 crystal structures
  14. High-pressure crystal chemistry of binary intermetallic compounds
  15. Re3B type intermetallics — crystal chemistry, bonding and properties
  16. Ti2Rh6B – a new boride with a double perovskite-like structure containing octahedral Rh6 clusters
  17. On the formation and crystal structure of the Pd6B phase
  18. Crystal growth and magnetic properties of rare earth borosilicides
  19. The effect of transition metal doping on thermal conductivity of YB66
  20. Structure refinements of iron borides Fe2B and FeB
  21. Cubic structure types of rare-earth intermetallics and related compounds
  22. Structural variations in Gd5Si4-xSnx: size vs. electronic effects
  23. Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
  24. Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
  25. Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
  26. Ge40.0Te5.3I8: synthesis, crystal structure, and properties of a new clathrate-I compound
  27. Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
  28. Low- and high-temperature structures of YbCuBi
  29. (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
  30. Geometric variations and electron localizations in intermetallics: PbFCl type compounds
  31. A novel series of sphere packings with arbitrarily low density
  32. Books Received
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2025 De Gruyter Brill
Downloaded on 13.9.2025 from https://www.degruyterbrill.com/document/doi/10.1524/zkri.2006.221.5-7.533/html
Scroll to top button