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- Title
Tb<sub>3</sub>Sn<sub>7</sub>: polymorphism and crystal structure of high-temperature modification.
- Authors
Oshchapovsky, Igor; Pavlyuk, Volodymyr; Chumak, Igor
- Abstract
During the systematic investigation of the tin-rich side of the Tb-Sn binary system temperatures of non-variant transformations were established. The crystal structure of βTb3Sn7 was determined for the first time from single-crystal diffraction data. Parameters of the unit cell have been determined previously by Manfrinetti & Palenzona [(1993), J. Alloys Compd. 201, 43-47], but the structure was not solved until now. The compound belongs to a new structure type with space group Pmmm. The unit cell contains two split positions: Sn7 (Wyckoff 1 a), Sn7 A (Wyckoff 2 q) and Sn8 (Wyckoff 1 d), Sn8 A (Wyckoff 2 s). Structures of both α- and β-modifications of Tb3Sn7 can be described as close packing of the coordination polyhedra of Tb atoms. In turn these polyhedra can be constructed of fragments of simple AuCu3 and CsCl types.
- Subjects
CRYSTAL structure; POLYMORPHISM (Crystallography); BINARY metallic systems; POLYHEDRA; ATOMS
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2013, Vol 69, Issue 6, p527
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052519213024378