Open AccessОптические свойства фазопеременных материалов системы германий--сурьма-теллур составов Ge-=SUB=-14-=/SUB=-Sb-=SUB=-29-=/SUB=-Te-=SUB=-57-=/SUB=- и Ge-=SUB=-15-=/SUB=-Sb-=SUB=-15-=/SUB=-Te-=SUB=-70-=/SUB=- в дальнем инфракрасном диапазоне
Author(s) -
V. A. Ryzhov,
B. T. Melekh,
L. P. Kazakova
Publication year - 2021
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2021.07.51013.9639
Subject(s) - amorphous solid , chalcogenide , materials science , infrared spectroscopy , absorption spectroscopy , crystallography , absorption (acoustics) , crystal (programming language) , spectral line , analytical chemistry (journal) , phonon , infrared , phase (matter) , crystal structure , molecular vibration , chemistry , raman spectroscopy , condensed matter physics , optics , optoelectronics , physics , programming language , organic chemistry , chromatography , astronomy , computer science , composite material
Infrared absorption spectra of chalcogenide alloys of the GST system with the compositions Ge14Sb29Te57 and Ge15Sb15Te70 in the amorphous and crystalline state were measured and analyzed in the range of 20 – 400 cm– 1 (0.6 – 12 THz) at room temperature. Absorption at these frequencies is due to the manifestation of correlated torsional vibrations of structural units of the amorphous alloy and phonon modes of the crystal. The performed assignment of absorption bands and the revealed differences in the IR spectra make it possible to more confidently represent the possible molecular mechanism of reversible amorphous-crystalline transformations in the studied phase-changing materials