Synthesis of Germanium–Gallium–Tellurium ( <scp> <scp>Ge</scp> </scp> – <scp> <scp>Ga</scp> </scp> – <scp> <scp>Te</scp> </scp> ) Ceramics by Ball‐Milling and Sintering

Abstract

In this study, we present the preparation of a bulk material with a composition of 80 GeTe 2 –20 Ga 2 Te 3 by combining mechanosynthesis and sintering. This composition cannot be prepared by conventional melt/quenching technique. The progressive evolution of the powder during ball‐milling is followed by X‐ray Diffraction ( XRD ) and Differential Scanning Calorimetry analysis. The final powder obtained is highly crystalline, but a glass transition temperature ( T g ) is observed, indicating the presence of some amorphous phase remaining, allowing for its efficient sintering. By hot‐pressing, a dense bulk material with a fine microstructure and a high electrical conductivity is obtained. The synthesis method described represents a simple and cost‐effective way to produce tellurium‐based materials of desired dimension with potential applications for optical storage or thermoelectric devices.