2006
DOI: 10.1103/physrevb.73.052202
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Dynamic sound attenuation at hypersonic frequencies in silica glass

Abstract: In order to clarify the origin of the dominant processes responsible for the acoustic attenuation of phonons, which is a much debatted topic, we present Brillouin scattering experiments in various silica glasses of different OH impurities content. A large temperature range, from 5 to 1500 K is investigated, up to the glass transition temperature. Comparison of the hypersonic wave attenuation in various samples allows to identify two different processes. The first one induces a low temperature peak related to r… Show more

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Cited by 18 publications
(13 citation statements)
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“…The experiment is performed on a spectrosil sample purchased by SILO (Firenze). The sample is characterised by an OH -content of the order of 1500 ppm, that we determined by means of infrared absorption, consistent with similar values found in the literature for the spectrosil samples [22].…”
Section: Experiments and Resultssupporting
confidence: 76%
See 1 more Smart Citation
“…The experiment is performed on a spectrosil sample purchased by SILO (Firenze). The sample is characterised by an OH -content of the order of 1500 ppm, that we determined by means of infrared absorption, consistent with similar values found in the literature for the spectrosil samples [22].…”
Section: Experiments and Resultssupporting
confidence: 76%
“…It should however be noted that the OH -content may have a significant influence on the shape and intensity of the attenuation peak found in the temperature dependence at around 150 K, as pointed out in a recent paper [22]. Nevertheless, the OH -content does not affect the attenuation for temperatures outside the peak region, below 50 K and above 250 K, where the discrepancy between our UV measurement and the model (dashed line of figure 5) is evident.…”
Section: Discussioncontrasting
confidence: 37%
“…It is well known that by changing the thermal history or the thermodynamic path to the glass transition the obtained glasses present different elastic properties, both in term of sound velocity and in term of acoustic attenuation [24,25], because of the different amount of internal stresses that develop for the inability of the system to comply with the need to contract under external stimuli [26][27][28][29]. The stress-induced modification of elastic properties in the glass can influence the vibrational dynamics and may have a role in the evolution of the BP.…”
Section: Introductionmentioning
confidence: 99%
“…In particular, these are thermal processes occurring near the critical point for the liquid -gas system, attenuation of the electromagnetic field energy in the magnetic resonance phenomena, and anomalous attenuation and propagation of acoustic waves in the media under phase transitions. The latter are important due to the fact that they underlie the resonant and ultrasonic methods of investigation of critical dynamics.A unique feature of ultrasonic methods is an anomalously strong attenuation of ultrasound [1][2][3] in the vicinity of the temperatures of the phase transition of the second type, which is vividly revealed in the experiments. This anomalous behavior is due to the effects of interaction of low-frequency acoustic excitations with large-scale fluctuations of the order parameter.…”
mentioning
confidence: 99%
“…A unique feature of ultrasonic methods is an anomalously strong attenuation of ultrasound [1][2][3] in the vicinity of the temperatures of the phase transition of the second type, which is vividly revealed in the experiments. This anomalous behavior is due to the effects of interaction of low-frequency acoustic excitations with large-scale fluctuations of the order parameter.…”
mentioning
confidence: 99%