Skip to Main content Skip to Navigation

Energy dissipation in oxide glasses

Abstract : The origin of sound attenuation at low and high frequency in glasses stays elusive mainly because of the complex temperature and frequency dependence of the phenomena at its root. Indeed, the presence of complex structures and multi-scale organizations in glasses induce the existence of relaxation time ranging from the second to the femto-second and of spatial correlation ranging from the Angström to a hundred nanometers. At low-frequency, a better understanding of the phenomena at the origin of dissipation would be beneficial to several applications. For example, the multi-layers coating the mirrors of gravitational waves detectors consists of a superposition of two oxide glasses: silicate (SiO2) and tantalum pentoxide (Ta2O5), are an important source of dissipation. At high frequency, the study of dissipation raises theoretical questions about the link between attenuation and dissipation as well as between loclt asymmetry and dissipation. In the present study, we conducted an analysis of the interaction between mechanical waves and the structure of two oxide glasses using simulation techniques such as non-equilibrium molecular dynamics. At high-frequencies, we implemented and used mechanical spectroscopy to measure dissipation numerically and performed in parallel an analytical development based on the projection of the atomic motion on the vibrational eigenmodes. At low-frequencies, we used molecular dynamics to gather sets of thermally activated events that we classed in three categories based on topologically distinct atomic motions and from which we predicted dissipation numerically using a refreshed TLS model
Complete list of metadatas

Cited literature [103 references]  Display  Hide  Download
Contributor : Abes Star :  Contact
Submitted on : Tuesday, November 7, 2017 - 4:02:06 PM
Last modification on : Thursday, October 15, 2020 - 8:54:03 AM
Long-term archiving on: : Thursday, February 8, 2018 - 2:15:13 PM


Version validated by the jury (STAR)


  • HAL Id : tel-01630447, version 1



Tanguy Damart. Energy dissipation in oxide glasses. Acoustics [physics.class-ph]. Université de Lyon, 2017. English. ⟨NNT : 2017LYSE1189⟩. ⟨tel-01630447⟩



Record views


Files downloads