Optical Properties of the Ge.sub.14Sb.sub.29Te.sub.57 and Ge.sub.15Sb.sub.15Te.sub.70 Phase-Change Materials in the Far-Infrared Range

The infrared absorption spectra of Ge.sub.14Sb.sub.29Te.sub.57 and Ge.sub.15Sb.sub.15Te.sub.70 chalcogenide alloys in the amorphous and crystalline states are measured and analyzed in the wave-number range 20-400 cm.sup.-1 (0.6-12 THz) at room temperature. Absorption at these frequencies is caused b...

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Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2021-12, Vol.55 (12), p.968
Main Authors: Ryzhov, V. A, Melekh, B. T, Kazakova, L. P
Format: Article
Language:English
Subjects:
Analysis
Forest reserves
Metallic glasses
Optical properties
Vibration
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Summary:The infrared absorption spectra of Ge.sub.14Sb.sub.29Te.sub.57 and Ge.sub.15Sb.sub.15Te.sub.70 chalcogenide alloys in the amorphous and crystalline states are measured and analyzed in the wave-number range 20-400 cm.sup.-1 (0.6-12 THz) at room temperature. Absorption at these frequencies is caused by manifestation of the correlated torsional vibrations of structural units of the amorphous alloy and phonon modes of the crystal. Identification of the absorption bands and the observed differences between the infrared spectra make it possible to establish more confidently the possible molecular mechanism of reversible amorphous-to-crystalline transformations in the investigated phase-change materials.
ISSN:1063-7826
DOI:10.1134/S1063782621070162