Ultrasonic and hypersonic behaviours of borate glasses
Journal article, 2007

Comparative measurements of Brillouin light scattering and ultrasound in (K2O)0.04(B2O3)0.96 and (Ag2O)0.14(B2O3)0.86 borate glasses as a function of temperature between 1.5 and 300 K reveal that distinct mechanisms regulate the temperature behaviours of the acoustic attenuation. In the MHz range the attenuation and the sound velocity are mainly governed by (i) quantum-mechanical tunnelling below 20 K, (ii) thermally activated relaxations between 20 and 200 K and (iii) vibrational inharmonicity at even higher temperatures. In the GHz range and in the temperature interval between 77 and 300 K, additional contributions besides the relaxation process must be taken into consideration to account for the hypersonic attenuation.


Brillouin spectroscopy

Ultrasonic spectroscopy


Giovanni Carini

G. Tripodo

Lars Börjesson

Chalmers, Applied Physics, Condensed Matter Physics

Ezio Zanghellini

Chalmers, Applied Physics, Condensed Matter Physics

A. Bartolotta

Philosophical Magazine

1478-6435 (ISSN)

Vol. 87 697-703

Subject Categories

Condensed Matter Physics

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