Crystal structure determination of Ag 2 Ga by single crystal X-ray diffraction

✍ Scribed by Gunnæs, A. E.; Olsen, A.; Zagierski, P. T.; Klewe, B.; Karlsen, O. B.; Aasen, A.

• Book ID: 120687285
• Publisher: Oldenbourg Wissenschaftsverlag
• Year: 1998
• Tongue: English
• Weight: 804 KB
• Volume: 213
• Category: Article
• ISSN: 2194-4946
• DOI: 10.1524/zkri.1998.213.12.639

✦ Synopsis

Abstract

The crystal structure of ζ′-Ag~2~Ga has been determined by single crystal X-ray diffraction at 293 K and 150 K. The structure is hexagonal with the non-centrosymmetric space group P[unk]2__m__ (no. 189). The cell dimensions are a = 0.77680(16) nm, c = 0.28759(6) nm at 293 K and a = 0.77460(16) nm, c = 0.28704(5) nm at 150 K. ζ′-Ag~2~Ga has the InMg~2~ type of structure with nine atoms (six Ag and three Ga) on four different atomic sites (3__f__, 3__g__, l__b__ and 2__c__). The Ag atoms fully occupy the 3__f__ and 3__g__ positions and the Ga atoms the l__b__ and 2__c__ positions. The structure parameters (atomic positions and anisotropic thermal parameters) were refined using data collected on a Siemens SMART CCD SYSTEM. The composition of the single crystals was determined by Energy Dispersive X-ray Spectroscopy (EDS) in a Scanning Electron Microscope (SEM).