Ultrasonic attenuation in amorphous arsenic and red phosphorus

Gilroy, K. S.; Phillips, W. A.

doi:10.1016/0022-3093(80)90351-8

Cited by 9 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…been the case in [6], as suggested from data on other glasses presented by the same authors in [26] which show long absorption tails at high T . This notion is also supported by fits that are explained below.…”

Section: Analysis Of Sonic and Ultrasonic Relaxational Datasupporting

confidence: 68%

Anharmonic versus relaxational sound damping in glasses. II. Vitreous silica

2005

View full text Add to dashboard Cite

The temperature dependence of the frequency dispersion in the sound velocity and damping of vitreous silica is reanalyzed. Thermally activated relaxation accounts for the sound attenuation observed above 10 K at sonic and ultrasonic frequencies. Its extrapolation to the hypersonic regime reveals that the anharmonic coupling to the thermal bath becomes important in Brillouin-scattering measurements. At 35 GHz and room temperature, the damping due to this anharmonicity is found to be nearly twice that produced by thermally activated relaxation. The analysis also reveals a sizeable velocity increase with temperature which is not related with sound dispersion. A possible explanation is that silica experiences a gradual structural change that already starts well below room temperature.

show abstract

Section: Analysis Of Sonic and Ultrasonic Relaxational Datasupporting

confidence: 68%

Anharmonic versus relaxational sound damping in glasses. II. Vitreous silica

2005

View full text Add to dashboard Cite

show abstract

“…However, the accuracy of those numerical values is poor since the ultrasonic frequency range of our study is not very large. Equation (2) gives an attenuation peak larger than a pure Debye peak but still narrower than the experimental peak within a factor 2 [4].…”

mentioning

confidence: 87%

“…Many amorphous materials, such as fused silica [1], amorphous arsenic [2], amorphous PdSi [3] exhibit an internal-friction peak at low temperature (T 100 K) and high frequency (1 to 100 MHz). Anderson and Bommel suggested that thermal activated motions of some oxygen atoms could be the source of the internal friction in fused silica [1].…”

mentioning

confidence: 99%

Internal friction in amorphous polystyrene at low temperature and high frequency

Duquesne

Bellessa

1981

J. Phyique Lett.

View full text Add to dashboard Cite

2014 Nous présentons l'observation, dans le polystyrène, d'un pic de frottement interne localisé autour de 80 K à 50 MHz. Ce pic présente beaucoup de similitudes avec celui observé dans le sélénium amorphe et est interprété dans le cadre du même modèle. Nous expliquons nos résultats à l'aide de processus de relaxation par activation thermique dont les énergies sont distribuées de façon constante entre 0 et 600 K. Nous suggérons que le pic observé est la résolution à haute fréquence de l'épaulement 03B5 qui a été observé précédemment à beaucoup plus basse fréquence. Abstract. 2014 The existence in polystyrene of an internal-friction peak around 80 K at 50 MHz is reported. This peak displays many similarities with the peak observed in amorphous selenium. It is interpreted in the frame of the same model. We explain our results with thermal activated relaxation processes displaying a constant distribution of barrier heights between 0 and 600 K. We suggest that the observed peak is the resolution at high frequency of the 03B5-shoulder which has been reported previously at much lower frequency.

show abstract

Properties of Two-Level Systems

Phillips

1985

Amorphous Solids and the Liquid State

View full text Add to dashboard Cite

Ultrasonic attenuation in amorphous arsenic and red phosphorus

Cited by 9 publications

References 13 publications

Anharmonic versus relaxational sound damping in glasses. II. Vitreous silica

Anharmonic versus relaxational sound damping in glasses. II. Vitreous silica

Internal friction in amorphous polystyrene at low temperature and high frequency

Properties of Two-Level Systems

Contact Info

Product

Resources

About