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Updated: May 31, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

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Published on: July 17, 2020

'Wrong bonds' in sputtered amorphous Ge(2)Sb(2)Te(5).

P Jóvári¹, I Kaban, J Steiner

¹Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest POB 49, H-1525 Hungary.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 23, 2011

Summary

This summary is machine-generated.

The structure of amorphous Germanium-Antimony-Tellurium (Ge2Sb2Te5) reveals significant Ge-Ge and Sb-Ge bonds, alongside existing Te-Sb and Te-Ge bonds. All elements in this phase follow the

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Area of Science:

Materials Science
Solid State Physics
Inorganic Chemistry

Background:

Amorphous Germanium-Antimony-Tellurium (Ge2Sb2Te5) is a technologically important phase-change material.
Understanding the local atomic structure is crucial for optimizing its properties.

Purpose of the Study:

To elucidate the bonding environment and local atomic structure of sputtered amorphous Ge2Sb2Te5.
To investigate the presence and significance of various atomic bonds within the amorphous structure.

Main Methods:

High-energy X-ray diffraction
Neutron diffraction
Ge, Sb, and Te K-edge Extended X-ray Absorption Fine Structure (EXAFS) measurements
Simultaneous modeling using Reverse Monte Carlo (RMC) simulations

Main Results:

Identified significant Ge-Ge and Sb-Ge bonding in amorphous Ge2Sb2Te5.
Confirmed the presence of Te-Sb and Te-Ge bonds, also observed in crystalline phases.
All constituent elements (Ge, Sb, Te) were found to obey the '8-N' rule, indicating a stable bonding configuration.

Conclusions:

The amorphous structure of Ge2Sb2Te5 exhibits a unique bonding network distinct from its crystalline counterparts.
The '8-N' rule compliance suggests a chemically stable amorphous phase.
These findings provide fundamental insights into the structure-property relationships of Ge2Sb2Te5 materials.