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Synthesis of Germanium–Gallium–Tellurium ( Ge – Ga – Te ) Ceramics by Ball‐Milling and Sintering
Author(s) -
Hubert Mathieu,
Petracovschi Elena,
Zhang XiangHua,
Calvez Laurent
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12299
Subject(s) - materials science , sintering , differential scanning calorimetry , ball mill , gallium , amorphous solid , ceramic , chemical engineering , mineralogy , metallurgy , crystallography , chemistry , physics , thermodynamics , engineering
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.