The study was done on the structure change of glass at intermediate distances, 5–20 angstroms, it was pressurized upto 100 GPa.
At lower pressures, atoms around a central Si tend to show tetrahedral symmetry (SiO₄).
As pressure increases, the atomic structure in silica glass goes through two stages of reorganization.
Researchers plotted ΞΎ (correlation length) versus pressure graph, it shows two maxima.
During the first maxima Si is bonded with 5 Oxygen. Second maximum (at higher pressure) Si–O units shift to 6-coordination octahedral and cubic.
Different parameters calculated here are:
pair correlation function- It shows the typical distances between Si–O, O–O, and Si–Si atoms, and how these change when the glass is squeezed.
Coordination number-how many O bond with Si
Correlation Length- the distance over which the positions of atoms or material's properties are "correlated" with each other. Beyond this length, the atomic arrangement of the material becomes statistically independent and appears random.
Four-Point Correlation Function
Spherical Harmonic coefficient-It tells how strong symmetry shapes are like tetrahedral or cubic.
https://arxiv.org/html/2510.13178v1
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