Ultrasonic and hypersonic behaviours of borate glasses
Artikel i vetenskaplig tidskrift, 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, Teknisk fysik, Kondenserade materiens fysik

Ezio Zanghellini

Chalmers, Teknisk fysik, Kondenserade materiens fysik

A. Bartolotta

Philosophical Magazine

1478-6435 (ISSN) 1478-6443 (eISSN)

Vol. 87 697-703


Den kondenserade materiens fysik

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