Work

The incommensurate composite Y x Os 4 B 4 ( x = 1.161)

Year: 2024

Type: article

Abstract: Y x Os 4 B 4 ( x = 1.161) crystallizes as a tetragonal incommensurate composite of columns of Y atoms extending along [001] in an Os 4 B 4 framework. The structure was refined using the superspace approach. The basic structure of the Y subsystem can be idealized as having I 4/ mmm symmetry, with a crystallographically unique Y atom located on the 4/ mmm position. The actual superspace symmetry is P 4 2 / nmc (00σ 3 ) s 0 s 0. The Y atoms feature only subtle positional modulation in the [001] direction. The Os 4 B 4 subsystem [ P 4 2 / ncm (00σ 3 )00 ss superspace symmetry] is built of columns of edge-sharing Os 4 tetrahedra extending along [001] and B 2 dumbbells. The Os 4 tetrahedra feature pronounced positional modulation with a distinct variation of the Os—Os bond lengths. Modulation of the B 2 dumbbells is best described as a rotation about the [001] axis.

Source: Acta Crystallographica Section B Structural Science Crystal Engineering and Materials

DOI: 10.1107/s205252062400982x

Authors: Berthold Stöger, Oksana Sologub, Leonid Salamakha

Institution: TU Wien

Language: English

Topic: Crystal Structures and Properties

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,220

Funders: Austrian Science Fund, Technische Universität Wien, Technische Universität Wien Bibliothek