A new ternary compound with the BGa8Ir4 structure type in the Al-Au-Ir system

Joris Kadok; Marie Cécile de Weerd; Pascal Boulet; Vincent Fournée; Julian Ledieu

doi:10.1107/S2052520618016712

A new ternary compound with the BGa₈Ir₄ structure type in the Al-Au-Ir system

Acta Crystallogr B Struct Sci Cryst Eng Mater. 2019 Feb 1;75(Pt 1):49-52. doi: 10.1107/S2052520618016712. Epub 2019 Jan 23.

Authors

Joris Kadok¹, Marie Cécile de Weerd¹, Pascal Boulet¹, Vincent Fournée¹, Julian Ledieu¹

Affiliation

¹ Institut Jean Lamour (UMR7198 CNRS, Université de Lorraine), Campus ARTEM 2 allée André Guinier, 54011 Nancy Cedex, France.

PMID: 32830777
DOI: 10.1107/S2052520618016712

Abstract

Following the recent determination of the Al₃AuIr structure, a new ternary phase has been identified in the Al-Au-Ir phase diagram. It has a chemical composition Al₉(Au;Ir)₄ with an apparently low gold content. Its crystal structure has been determined with single-crystal X-ray diffraction. The new compound crystallizes in the tetragonal crystal system and has been successfully solved in space group I4₁/acd (Pearson symbol tI104) with lattice parameters a = 8.6339 (2) and c = 21.8874 (7) Å. Atomic environments are described as well as similarities with the BGa₈Ir₄ compound.

Keywords: X-ray diffraction; crystal structure; entropy; intermetallic.