The ternary phase diagram Sb-Sn-Ti

[摘要] The ternary intermetallic compound SbSnTi is known for a reversible uptake of Li at low potentials versus pure Li and is therefore a candidate as anode material for use in Li-ion batteries (LiBs). Up to now, no phase diagram data for the ternary Sb-Sn-Ti system have been reported in literature, which is, however, crucial for the understanding of the lithiation process. In this work isothermal sections of this system at 600 degrees C, 800 degrees C and 1000 degrees C were acquired for the first time. They are based on powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM/EDX) investigations of alloy samples. During our investigations two new ternary phases, SbxSn19-xTi15 and (SbxSn1-x)(3-y)Ti5+y, were recognized from PXRD patterns; the crystal structures were subsequently determined by single-crystal X-ray diffraction. SbxSn19-xTi15 crystallizes with the cubic space group Pm-3 (No. 200), the lattice parameter is a = 8.8502 angstrom. (SbxSn1-x)(3-y)Ti5+y shows tetra-gonal symmetry with the lattice parameters a = 10.553 angstrom and c = 5.3982 angstrom and the space group I4/mcm (No. 140). A further ternary compound, Sb4SnTi5, could be identified; its incommensurate crystal structure could not yet be fully described. (C) 2021 The Author(s). Published by Elsevier B.V.

[发布日期] 2021-10-25

[关键词] Intermetallics;Phase diagrams;X-ray diffraction;Crystal structure