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Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
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Iliya Todorov
Veröffentlicht/Copyright:
25. September 2009
Abstract
The title compounds were synthesized from the elements by heating the corresponding stoichiometric mixtures at high temperature. Their structures were determined from single-crystal X-ray diffraction. Na2Ba4Ga2Sb6 (Pnma, Z = 8, a = 12.3468(10) Å, b = 10.6621(10) Å, c = 13.8344(10) Å) contains chains of ∞[Ga2Sb6]10–. The repeating unit is made of an edge-sharing Ga-centered tetrahedron GaSb2(μ-Sb)2 and another Ga-centered tetrahedron but with additional antimony that is exo-bonded to one of the corners forming Sb–Sb dumbells, i.e. GaSb(Sb–Sb)(μ-Sb)2. The unit connects to neighboring units via sharing two corners of the tetrahedra, i.e. [Ga2Sb5Sb2/2]. Li13Ba8GaSb12 (C2/m, Z = 2, a = 18.0650(10) Å, b = 4.9407(10) Å, c = 13.0123(10) Å, β = 126.728(10)°) contains three different types of anions: single-atom anions of Sb3–, dumbells of Sb4–, and isolated Ga-centered tetrahedra of GaSb49–. The two compounds are electronically balanced, and this is confirmed by four-probe conductivity and magnetic measurements. Their very narrow band gaps, 0.014 and 0.049 eV for Na2Ba4Ga2Sb6 and Li13Ba8GaSb12, respectively, make them potential thermoelectric materials.
Keywords: Intermetallics; Zintl phases; Thermoelectric materials; Single crystal structure analysis; X-ray diffraction
:
Published Online: 2009-9-25
Published in Print: 2006-5-1
© by Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Editorial: Crystal Chemistry of Intermetallic Compounds
- Fritz H. Laves – 100 years young
- Fritz H. Laves – an ideal for generations
- Gustav E. R. Schulze's pioneering work on Laves phases
- Preparation, phase stability and structure of the C36 Laves phase Nb1–xCo2+x
- Atom order and thermodynamic properties of the ternary Laves phase Ti(TiyNixAl1–x–y)2
- Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)
- Microscopic structures of Laves phases and structurally related compounds: a transmission electron microscopy study
- Binary rare earth Laves phases — an overview
- Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
- Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
- Reflections on symmetry and formation of axial quasicrystals
- Mosaic-like tilings derivated from o-Co4Al13 and m-Co4Al13 crystal structures
- High-pressure crystal chemistry of binary intermetallic compounds
- Re3B type intermetallics — crystal chemistry, bonding and properties
- Ti2Rh6B – a new boride with a double perovskite-like structure containing octahedral Rh6 clusters
- On the formation and crystal structure of the Pd6B phase
- Crystal growth and magnetic properties of rare earth borosilicides
- The effect of transition metal doping on thermal conductivity of YB66
- Structure refinements of iron borides Fe2B and FeB
- Cubic structure types of rare-earth intermetallics and related compounds
- Structural variations in Gd5Si4-xSnx: size vs. electronic effects
- Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
- Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
- Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
- Ge40.0Te5.3I8: synthesis, crystal structure, and properties of a new clathrate-I compound
- Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
- Low- and high-temperature structures of YbCuBi
- (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
- Geometric variations and electron localizations in intermetallics: PbFCl type compounds
- A novel series of sphere packings with arbitrarily low density
- Books Received
Schlagwörter für diesen Artikel
Intermetallics;
Zintl phases;
Thermoelectric materials;
Single crystal structure analysis;
X-ray diffraction
Artikel in diesem Heft
- Editorial: Crystal Chemistry of Intermetallic Compounds
- Fritz H. Laves – 100 years young
- Fritz H. Laves – an ideal for generations
- Gustav E. R. Schulze's pioneering work on Laves phases
- Preparation, phase stability and structure of the C36 Laves phase Nb1–xCo2+x
- Atom order and thermodynamic properties of the ternary Laves phase Ti(TiyNixAl1–x–y)2
- Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)
- Microscopic structures of Laves phases and structurally related compounds: a transmission electron microscopy study
- Binary rare earth Laves phases — an overview
- Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
- Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
- Reflections on symmetry and formation of axial quasicrystals
- Mosaic-like tilings derivated from o-Co4Al13 and m-Co4Al13 crystal structures
- High-pressure crystal chemistry of binary intermetallic compounds
- Re3B type intermetallics — crystal chemistry, bonding and properties
- Ti2Rh6B – a new boride with a double perovskite-like structure containing octahedral Rh6 clusters
- On the formation and crystal structure of the Pd6B phase
- Crystal growth and magnetic properties of rare earth borosilicides
- The effect of transition metal doping on thermal conductivity of YB66
- Structure refinements of iron borides Fe2B and FeB
- Cubic structure types of rare-earth intermetallics and related compounds
- Structural variations in Gd5Si4-xSnx: size vs. electronic effects
- Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
- Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
- Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
- Ge40.0Te5.3I8: synthesis, crystal structure, and properties of a new clathrate-I compound
- Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
- Low- and high-temperature structures of YbCuBi
- (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
- Geometric variations and electron localizations in intermetallics: PbFCl type compounds
- A novel series of sphere packings with arbitrarily low density
- Books Received
