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Tb3Sn7: polymorphism and crystal structure of high-temperature modification.

Igor Oshchapovsky1, Volodymyr Pavlyuk, Igor Chumak

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Summary

Researchers determined the crystal structure of beta-Terbium-3-Tin-7 (Tb3Sn7) for the first time. This new structure, belonging to a novel type, was solved using single-crystal diffraction data.

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high-temperature modificationpolymorphismstructure type

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid State Chemistry

Background:

  • The Tb-Sn binary system is crucial for understanding intermetallic compound formation.
  • Previous work by Manfrinetti & Palenzona (1993) established unit cell parameters for Tb3Sn7 but did not solve its structure.

Purpose of the Study:

  • To determine the crystal structure of the beta-modification of Tb3Sn7.
  • To characterize non-variant transformations in the tin-rich Tb-Sn system.

Main Methods:

  • Single-crystal X-ray diffraction was employed to solve the crystal structure.
  • Systematic investigation of the tin-rich side of the Tb-Sn binary system.

Main Results:

  • The crystal structure of beta-Tb3Sn7 was determined for the first time, revealing a new structure type with space group Pmmm.
  • The unit cell contains complex split positions for tin atoms (Sn7, Sn7A, Sn8, Sn8A).
  • Both alpha- and beta-Tb3Sn7 structures can be described as close packing of Tb atom coordination polyhedra.

Conclusions:

  • The detailed crystal structure of beta-Tb3Sn7 provides new insights into Tb-Sn intermetallic compounds.
  • The structural description based on coordination polyhedra fragments offers a new perspective on crystal packing.