Thermal Studies of Ge-Te-Ga Glasses

Effect of composition on the properties of Te–Ge thick films deposited by co-thermal evaporation

“…The Te 75 Ge 15 Ga 10 composition was recently highlighted as being a particularly interesting bulk material since its transmission domain is large and compatible with the Darwin mission requirements (from 6 to 20 μm) and its thermal stability higher than that of glasses richer in tellurium [3]. Only few papers deal with the deposition of Te-Ge-Ga films [4,5]. In each case, the method used is thermal evaporation and films are thin, i.e.…”

Devitrification of Bi- and Ga-containing germanium-based chalcogenide glasses

“…The second peak II observed in the first region of DSC curves does not change much with Bi addition. Therefore, it can be attributed to the crystallization of Ga-based phases (like Ga 2 Te 3 , Ga 2 Se 3 or mixed), which where identified in crystallized products of Ge-Te-Ga [17], Ga-As-Se [18] and Ga-As-Se-Te [18,19] glasses as well. The broad peak labeled III in the first region of DSC curves, the most probably, includes crystallization of trigonal Te and various metastable Ga/Ge-Te phases, like GeTe 2 identified in binary Ge-Te system [17,20].…”

“…Therefore, it can be attributed to the crystallization of Ga-based phases (like Ga 2 Te 3 , Ga 2 Se 3 or mixed), which where identified in crystallized products of Ge-Te-Ga [17], Ga-As-Se [18] and Ga-As-Se-Te [18,19] glasses as well. The broad peak labeled III in the first region of DSC curves, the most probably, includes crystallization of trigonal Te and various metastable Ga/Ge-Te phases, like GeTe 2 identified in binary Ge-Te system [17,20]. The second family of crystallization processes occurred in high-temperature region (peaks IV-VI) can be related to the crystallization of stable Ge-Te (GeTe, Ge 2 Te 3 or Ge 17 Te 83 ) [17,21], Ge-Se (GeSe, GeSe 2 , Ge 4 Se 9 ) or mixed phases.…”

Structural interpretation of the enthalpy relaxation kinetics of (GeTe4)y(GaTe3)1−y far-infrared glasses

“…self-aligning CO 2 detectors/traps fighting global warming or IR optics telescopes detecting biological life markers on exoplanets. [3,5] Due to the fully telluride matrix, these glasses exhibit one of the highest transmittances in the far-IR region (above~18 μm) [6,7], the addition of gallium then increases the resistance of these glasses against crystallization. Despite the importance of the Ge-Ga-Te system, thermal behavior of these glasses was never studied in detail -only the values of characteristic temperatures corresponding to glass transition (T g ) and crystallization (T c ) were reported.…”