Identification of amorphous zones in the GeTeSb system

✍ Scribed by P. Lebaudy; J.M. Saiter; J. Grenet; M. Belhadji; C. Vautier

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 305 KB
• Volume: 132
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(91)90384-y

✦ Synopsis

We studied the phase diagram of the Ge-Te-Sb ternary system in order to establish the different compositions which lead to an amorphous material. The system was investigated by differential thermal analysis, differential scanning calorimetry and by X-ray diffraction at fixed temperature.

We have determined the eutectic compositions of the system and tested the ability of these compositions to give an amorphous material.

Only a small range of compositions, around the Ge~sTe82Sb 3 eutectic compound, gives an amorphous material after quenching from the melt; this range of composition is widened when a vapour deposition technique is used. One of these compositions has two glass transition temperatures and two crystallization peaks, showing the existence of two amorphous states in the sample.