Figure 5: Octahedral Ti-centred atomic motifs in amorphous Ti0.4Sb2Te3.
From: One order of magnitude faster phase change at reduced power in Ti-Sb-Te
(a) The amorphous structure of Ti0.4Sb2Te3 (TST), showing a majority of the Ti, are bonded with Te and sixfold coordinated in an octahedral-like geometry. (b) The coordination number distribution of Ge and Ti in the respective amorphous model. (c) The bond angle distributions (BADs) around Ge in amorphous Ge2Sb2Te5 (GST) and Ti in amorphous TST. Inset shows the BADs around Sb and Te in amorphous GST and TST, respectively. Vertical dash lines indicate the positions of 60, 90 and 109.5°. (d) Proposed Ti-centred atomic motifs (TCAMs) in amorphous and crystalline TST.
