Fig. 2: Contour maps of the dynamical structure factor S(Q, E) measured by INS for glassy and crystalline SiO2. | NPG Asia Materials

Fig. 2: Contour maps of the dynamical structure factor S(Q, E) measured by INS for glassy and crystalline SiO2.

From: Structure and properties of densified silica glass: characterizing the order within disorder

Fig. 2: Contour maps of the dynamical structure factor S(Q, E) measured by INS for glassy and crystalline SiO2.The alt text for this image may have been generated using AI.

For the glasses, the boson peak is positioned at an energy EBP in the range 4.6–8.6 meV that depends on the density. There is no contribution toward the boson peak from scattering in the region of the FSDP in the neutron S(Q) function at QFSDP ∼1.50–1.87 Å−1 (Fig. 1B) nor from scattering at QFSDP/2. Instead, the main contributions towards S(Q, E) originate from Q-values associated with the principal peak at QPP ∼2.81–2.98 Å−1.

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