Bimodal distribution of Si-O-Si angles in sodo-silicate glasses

Bernard Hehlen (1) , D. R. Neuville (2) , Dimitrios Kilymis (1) , Simona Ispas (1)

1 L2C - Laboratoire Charles Coulomb
2 IPGP - Institut de Physique du Globe de Paris

Polarized Raman scattering is performed in a series of sodo-silicate glasses. The Si–O–Si inter-tetrahedral angle and its distribution are extracted using a model developed previously for densified silica, and the result are compared to ab initio atomistic calculations. The two techniques reveal a reduction of the most probable angle of about 0.30°/mol% of Na2O, but the shape of the angular distributions are different. The results suggest that Raman scattering enhances a specific angular distribution of Si–O–Si bridges, likely those close to sodium atoms, highlighting local angular heterogeneities.

Mots clés: Glass; Sodo-silicates; Vibrations; Raman; Structure

Domaines: Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]

Bernard Hehlen, D. R. Neuville, Dimitrios Kilymis, Simona Ispas. Bimodal distribution of Si-O-Si angles in sodo-silicate glasses. Journal of Non-Crystalline Solids, 2017, 469, pp.39-44. ⟨10.1016/j.jnoncrysol.2017.04.009⟩. ⟨hal-01624760⟩