Structural origins of the unusual thermal stability of amorphous CuxGe50-xTe50(0⩽x⩽33.3).
J Phys Condens Matter
; 35(30)2023 Apr 28.
Article
em En
| MEDLINE
| ID: mdl-37072003
ABSTRACT
We have investigated the local atomic structures of several compositions of the amorphous phase of the system CuxGe50-xTe50(0⩽x⩽33.3), based on extended x-ray absorption fine-structure as well as anomalous x-ray scattering experiments, and discuss the unusual trend regarding their thermal stability as a function of the Cu content. At low concentrations (x⩽15), Cu atoms tend to agglomerate in flat nanoclusters reminiscent of the crystalline phase of metallic Cu, leading to a more and more Ge-deficient Ge-Te host network structure with growing Cu content and an increasing thermal stability. At higher Cu concentrations (x⩾25), Cu is incorporated into the network, leading to an overall weaker bonding situation which is associated with a decreasing thermal stability.
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MEDLINE
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Ano de publicação:
2023
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Article