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Ultrasonic and hypersonic behaviours of borate glasses

Giovanni Carini ; G. Tripodo ; Lars Börjesson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Ezio Zanghellini (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; A. Bartolotta
Philosophical Magazine (1478-6435). Vol. 87 (2007), p. 697-703.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Glasses, Ultrasonic spectroscopy, Brillouin spectroscopy

Denna post skapades 2007-04-19.
CPL Pubid: 40696


Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)


Struktur- och vibrationsfysik
Mesoskopisk fysik

Chalmers infrastruktur