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Improved ZT in ball‐milled and spark plasma sintered Cu 15 As 30 Te 55 glass‐ceramics
Author(s) -
Morin Cédric,
Monnier Judith,
Vaney JeanBaptiste,
Delaizir Gaëlle,
Piarristeguy Andrea,
Candolfi Christophe,
Pradel Annie,
Lenoir Bertrand,
Alleno Eric
Publication year - 2019
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.16137
Subject(s) - materials science , spark plasma sintering , differential scanning calorimetry , ball mill , microstructure , crystallization , glass ceramic , scanning electron microscope , ceramic , composite material , analytical chemistry (journal) , mineralogy , chemical engineering , thermodynamics , physics , chemistry , chromatography , engineering
Abstract The influence of ball milling followed by Spark Plasma Sintering (SPS) on the thermoelectric properties of the Cu 15 As 30 Te 55 glass composition has been investigated by means of X‐ray diffraction, scanning electron microscopy, and differential scanning calorimetry. The microstructure, composition, and thermal stability of the ball‐milled samples before and after SPS have been correlated with the electrical and thermal transport properties. Upon ball milling, a glass‐to‐glass transformation is evidenced for short ball‐milling times, followed by crystallization of the metastable β ‐As 2 Te 3 phase within the glassy matrix. This glass‐to‐glass transformation favors the occurrence of the β ‐As 2 Te 3 phase during the SPS process. A maximum figure of merit ZT of 0.29 at 400 K is obtained in the sample exhibiting the largest β ‐As 2 Te 3 crystalline fraction. This ZT value is twice as high as the value obtained for the glass‐ceramic sintered from non‐ball‐milled powder.