Te-As-Se glass destabilization using high energy milling

Abstract

The Te 20 As 30 Se 50 (TAS) glass has been studied under the extreme conditions of high energy milling. Starting from the raw materials, an amorphization process occurs progressively reaching an unstable intermediate state and the final stable state then. Despite its high resistance against crystallization when made using silica tubes, an intermediate state is reached when mechanically alloyed into powder. The evolution of the glass structure has been investigated using Raman spectroscopy and MAS NMR of 77 Se according to the milling time. Optimized parameters and conditions to compact milled powders by Spark Plasma Sintering show the possibility to design infrared windows transparent from 2 to 20µm. A correlation to the thermo-mechanical properties of densified powder using hot pressing has been made.

Improved ZT in ball‐milled and spark plasma sintered Cu15As30Te55 glass‐ceramics

“…It can be noticed that this shifted peak is located at the same angle as a diffraction line of the crystallized phase. It could be due (a) to a structural transformation of the initial glass into another polyamorph as already observed in other chalcogenide glasses, 16,17 or (b) to the emergence of nanometric crystalline domains, considering the low stability (T c -T g ) of the glass (~30 K 6 ) where T c and T g are the crystallization and glass transition temperatures, respectively. Other evidences for this glass transformation will be further discussed below.…”

Mechanical Alloying and Concentration Quenching of the Luminescence of Pr3+ Ions in Chalcogenide Glass

“…The results obtained suggest that further research into developing methods of mechanical milling of chalcogenide glasses doped with RE elements and their subsequent sintering using, for example, Spark Plasma Sintering (SPS) technology [9], will make it possible to obtain glasses with significantly increased luminescence efficiency. Based on these glasses, optically active fibers for the IR range can be fabricated.…”

“…Consequently, the challenge arises from enhancing the homogeneity of RE element distribution within the chalcogenide glass matrix. It was previously shown that chalcogenide glasses can be successfully obtained by the mechanical alloying method from elementary substances [8,9]. This technique has been employed to obtain glassy compositions that are challenging to achieve through conventional melt quenching techniques [10,11].…”