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Molecular dynamics study of correlations between IR peak position and bond parameters of silica and silicate glasses: Effects of temperature and stress
Author(s) -
Luo Jiawei,
Zhou Yuxing,
Milner Scott T.,
Pantano Carlo G.,
Kim Seong H.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15187
Subject(s) - bond length , molecular geometry , materials science , silica glass , molecular dynamics , bond strength , isotropy , thermal expansion , chemical bond , anisotropy , structural change , crystallography , analytical chemistry (journal) , composite material , chemistry , optics , computational chemistry , layer (electronics) , crystal structure , organic chemistry , molecule , economics , macroeconomics , adhesive , physics
In the IR spectra of the silica and silicate glasses, the shifts of the maximum intensity position of the ν Si–O–Si,as band upon heating or applying mechanical stress could be attributed to changes in the distribution of bond parameters such as bond length and bond angle. Upon heating, isotropic expansion occurs and the density changes; upon applying mechanical stress, anisotropic strain is induced and a significant change in the Si–O–Si bond angle is observed. From molecular dynamics simulations of a silica glass, we show that the peak position shift correlates better with the asymmetric change in the Si–O bond length distribution, rather than the Si–O–Si bridge angle, the O–Si–O tetrahedral angle, or the density change. This new finding provides an insight into how and why the ν Si–O–Si,as IR peak of soda lime silica ( SLS ) glass shifts upon chemical strengthening via ion exchange and thermal tempering.