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20 April 2024

» arxiv » 1706.2928

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Correlated evolution of structure and mechanical loss of a sputtered silica film
Massimo Granata ; Elodie Coillet ; Valérie Martinez ; Vincent Dolique ; Alex Amato ; Maurizio Canepa ; Jérémie Margueritat ; Christine Martinet ; Alain Mermet ; Christophe Michel ; Laurent Pinard ; Benoît Sassolas ; Gianpietro Cagnoli ;
Date:	9 Jun 2017
Abstract:	Energy dissipation in amorphous coatings severely affects high-precision optical and quantum transducers. In order to isolate the source of coating loss, we performed an extensive study of Raman scattering and mechanical loss of a thermally-treated sputtered silica coating. Our results show that loss is correlated with the population of three-membered rings of Si-O$_4$ tetrahedral units, and support the evidence that thermal treatment reduces the density of metastable states separated by a characteristic energy of about 0.5 eV, in favour of an increase of the states separated by smaller activation energies. Finally, we conclude that three-fold rings are involved in the relaxation mechanisms only if they belong to more complex chain-like structures of 10 to 100 tetrahedra.
Source:	arXiv, 1706.2928
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