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. 2016 Jun 24;6:28560. doi: 10.1038/srep28560

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(a) Comparison of Raman spectra for a-GST326 (black) and as grown c-GST326 (blue); gray arrows highlight the mode positions. Sb₂Te₃ (red) and GeTe (green) Raman mode positions are plotted as references. (b) Raman spectra of crystallizing a-GST326 for three different temperatures. Modes of metastable c-GST326 are highlighted with yellow dashed lines. Upon increasing the temperature new modes appear, indication of the transition from c- to t-GST. At T = 200 °C the characteristic mode of t-GST (~170 cm⁻¹) appears (red dashed lines). In the red curve (T = 200 °C) the two arrows highlight the other two modes of the t-GST.