Bonding nature of local structural motifs in amorphous GeTe.


Despite its simple chemical constitution and unparalleled technological importance, the phase-change material germanium telluride (GeTe) still poses fundamental questions. In particular, the bonding mechanisms in amorphous GeTe have remained elusive to date, owing to the lack of suitable bond-analysis tools. Herein, we introduce a bonding indicator for amorphous structures, dubbed "bond-weighted distribution function" (BWDF), and we apply this method to amorphous GeTe. The results underline a peculiar role of homopolar Ge-Ge bonds, which locally stabilize tetrahedral fragments but not the global network. This atom-resolved (i.e., chemical) perspective has implications for the stability of amorphous "zero bits" and thus for the technologically relevant resistance-drift phenomenon.

DOI: 10.1002/anie.201404223

Cite this paper

@article{Deringer2014BondingNO, title={Bonding nature of local structural motifs in amorphous GeTe.}, author={Volker L Deringer and Wei Zhang and Marck Lumeij and Stefan Maintz and Matthias Wuttig and Riccardo Mazzarello and Richard Dronskowski}, journal={Angewandte Chemie}, year={2014}, volume={53 40}, pages={10817-20} }