Spectral Shape of Relaxations in Silica Glass

Wiedersich, J.; Adichtchev, S. V.; Rössler, E. A.

doi:10.1103/physrevlett.84.2718

Cited by 75 publications

(88 citation statements)

References 23 publications

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“…This already suggests that it is probably not appropriate to simply neglect the anharmonic damping as proposed for silica in [33]. This illustrates that the question is of importance, as it finally ties in with much more fundamental and debated issues, like the origin of the thermal anomalies of glasses [4].…”

Section: Discussionmentioning

confidence: 99%

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

et al. 2005

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This series discusses the origin of sound damping and dispersion in glasses. In particular, we address the relative importance of anharmonicity versus thermally activated relaxation. In this first article, Brillouin-scattering measurements of permanently densified silica glass are presented. It is found that in this case the results are compatible with a model in which damping and dispersion are only produced by the anharmonic coupling of the sound waves with thermally excited modes. The thermal relaxation time and the unrelaxed velocity are estimated.

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Section: Discussionmentioning

confidence: 99%

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

et al. 2005

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“…4 (b). It should be noted that in fused silica, the distribution of bond angles has been related to the characteristics of the observed low temperature mechanical loss peak [27], which is believed to arise from thermally activated transitions in asymmetric double well potentials [27,28]. It is quite possible that similar transitions between structural configurations with small energy barriers separating them may be related to the mechanical loss in the present coatings.…”

Section: Correlations Between Structural Parameters and Mechanical Lomentioning

confidence: 98%

Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Bassiri¹,

Evans²,

Borisenko³

et al. 2013

Acta Materialia

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can drop by as much as 40 % when it is doped with TiO 2 . We use a combination of electron diffraction data and atomic modeling using molecular dynamics to probe the atomic structure of these coatings, and examine the correlations between changes in the atomic structure and changes in the mechanical loss of these coatings. Our results show the first correlation between changes in the mechanical loss and experimentally measured changes in the atomic structure resulting from variations in the level of TiO 2 doping in TiO 2 doped Ta 2 O 5 coatings, in that increased homogeneity at the nearest neighbour level appears to correlate with reduced mechanical loss. It is demonstrated that subtle but measurable changes in the nearest neighbour homogeneity in an amorphous material

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“…Thermoelastic damping [25][26][27] (φ t ), frequency dependent bulk dissipation 11,28 (φ b ), and dissipation in the surface layer 29 (φ s ) all contribute to the total loss angle of the pendulum. The loss of the pendulum mode is reduced by the dilution factor (D), given by the ratio of energy stored in lifting the mass against gravity to energy stored in flexing the fiber.…”

Section: Introductionmentioning

confidence: 99%

Invited Article: CO2 laser production of fused silica fibers for use in interferometric gravitational wave detector mirror suspensions

Heptonstall

Barton

Bell

et al. 2011

Review of Scientific Instruments

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In 2000 the first mirror suspensions to use a quasi-monolithic final stage were installed at the GEO600 detector site outside Hannover, pioneering the use of fused silica suspension fibers in long baseline interferometric detectors to reduce suspension thermal noise. Since that time, development of the production methods of fused silica fibers has continued. We present here a review of a novel CO 2 laser-based fiber pulling machine developed for the production of fused silica suspensions for the next generation of interferometric gravitational wave detectors and for use in experiments requiring low thermal noise suspensions. We discuss tolerances, strengths, and thermal noise performance requirements for the next generation of gravitational wave detectors. Measurements made on fibers produced using this machine show a 0.8% variation in vertical stiffness and 0.05% tolerance on length, with average strengths exceeding 4 GPa, and mechanical dissipation which meets the requirements for Advanced LIGO thermal noise performance.

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Spectral Shape of Relaxations in Silica Glass

Abstract: Precise low-frequency light scattering experiments on silica glass are presented, covering a broad temperature and frequency range ( 9 GHz Show more

Cited by 75 publications

References 23 publications

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

Anharmonic versus relaxational sound damping in glasses. I. Brillouin scattering from densified silica

Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Invited Article: CO2 laser production of fused silica fibers for use in interferometric gravitational wave detector mirror suspensions

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