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Penta-terbium lithium tris-tannide, Tb(5)LiSn(3)
Acta Crystallographica. Section E, Structure Reports Online
|January 6, 2012
Summary
Researchers discovered a new ternary phase, penta-terbium lithium tris-tannide (Tb(5)LiSn(3)), with a hexagonal structure. This finding expands the understanding of rare earth intermetallic compounds and their unique crystallographic arrangements.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Ternary intermetallic compounds offer unique structural and electronic properties.
- Rare earth stannides are known for diverse crystal structures.
- Understanding new phases like Tb(5)LiSn(3) is crucial for materials discovery.
Purpose of the Study:
- To characterize the crystal structure of the novel ternary phase Tb(5)LiSn(3).
- To analyze the coordination environments and bonding characteristics within the new phase.
- To compare the structure with related binary and ternary intermetallic compounds.
Main Methods:
- Single-crystal X-ray diffraction was used to determine the crystal structure.
- Analysis of interatomic distances and coordination polyhedra was performed.
- Comparison with known structure types, such as Hf(5)CuSn(3) and Mn(5)Si(3), was conducted.
Main Results:
- Tb(5)LiSn(3) crystallizes in the hexagonal Hf(5)CuSn(3) structure type.
- The asymmetric unit contains distinct terbium, lithium, and tin sites with specific symmetries.
- Coordination numbers and polyhedral environments, including Frank-Kasper polyhedra, were identified for each atom.
Conclusions:
- The new phase Tb(5)LiSn(3) represents a 'filled' version of binary RE(5)Sn(3) phases.
- The coordination environments suggest metallic bonding within the structure.
- This discovery contributes to the knowledge of structure-property relationships in rare earth stannides.
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