Materials Data on Ta5Si3 by Materials Project

Abstract

Ta5Si3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Ta–Si bond distances ranging from 2.61–2.73 Å. In the second Ta site, Ta is bonded to six Si atoms to form distorted corner-sharing TaSi6 octahedra. The corner-sharing octahedra tilt angles range from 0–51°. There are four shorter (2.57 Å) and two longer (2.98 Å) Ta–Si bond lengths. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to ten Ta atoms. In the second Si site, Si is bonded in a 9-coordinate geometry to eight Ta and one Si atom. The Si–Si bond length is 2.41 Å.