Crystal structure of U2Pt2Sn: a new derivative of the tetragonal U3Si2-type structure

Abstract

The crystal structure of the new ternary stannide U₂Pt₂Sn has been investigated by both X-ray powder diffraction and electron diffraction. It crystallizes in a tetragonal unit cell with a= 768.1(1) pm and c= 739.1(1) pm. This crystal structure is a new superstructure of the tetragonal U₃Si₂-type which appears on account of the existence of short Pt–Pt distances. The crystal structure of U₂Pt₂Sn is described taking into consideration those of UPt and UPt₂Sn.