The Structure of the Amorphous (GeTe)1–x (Sb2Te3) x System and Implications for its Phase-Change Properties

Autor:	Nils Blanc, Jens Rüdiger Stellhorn, Bernhard Kaiser, Shinji Kohara, Nathalie Boudet, Shinya Hosokawa, Hiroo Tajiri, Wolf Christian Pilgrim, Koji Kimura
Rok vydání:	2020
Předmět:	Phase change Chemical physics 0103 physical sciences Structure (category theory) 02 engineering and technology Physical and Theoretical Chemistry Anomalous X-ray scattering 021001 nanoscience & nanotechnology 010306 general physics 0210 nano-technology 01 natural sciences Amorphous solid
Zdroj:	Zeitschrift für Physikalische Chemie. 235:141-167
ISSN:	2196-7156 0942-9352
DOI:	10.1515/zpch-2020-1633
Popis:	We describe structural features of ternary Ge-Sb-Te glasses based on anomalous X-ray scattering experiments for four different compositions along the pseudo-binary line (GeTe)1–x (Sb2Te3) x for 0 ≤ x ≤ 2 3 $0\leq x\leq\frac{2}{3}$ , which comprises technologically important phase-change materials. The data are analyzed with reverse Monte Carlo modeling. This way, detailed information on the local environments around all constituent elements are obtained and their evolution with the chemical composition is described. This approach gives a consistent view of the atomic scale structure of the amorphous networks in these compounds. Thereby, it is possible to derive the relationship between the relevant material properties and the determining structural features. In particular, it is shown that the optical contrast related to the phase change is associated with the evolution of the Ge-Te core network.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2e2f9fcb18779b3c1985a9ec019200bd https://doi.org/10.1515/zpch-2020-1633 Zobrazit plný text záznamu