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

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(a) FIR absorbance spectra for a-GST326 and c-GST326, black and blue curves, respectively. The spectra are normalized to the Si substrate. (b) Zoom around GST225 absorption feature (30 to 140 cm⁻¹) (blue), with Sb₂Te₃ (red) and GeTe (green) spectra as references. (c) Fit of the GST326 experimental curve using two Lorentzian peaks centered at the position of the Sb₂Te₃ (red) and GeTe (blue) modes. (d) Fit of GST225 for comparison.