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Hypersonic attenuation in cesium borate glasses: Relaxation and anharmonicity

Giovanni Carini ; G. Tripodo ; Lars Börjesson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. 15th International Conference on Internal Friction and Mechanical Spectroscopy (ICIFMS-15). Perugia, ITALY. JUL 20-25, 2008 (0921-5093). Vol. 521-22 (2009), p. 247-250.
[Konferensbidrag, refereegranskat]

The internal friction and the sound velocity in a cesium borate glass (Cs(2)O)(0.14)(B(2)O(3))(0.86) were measured at ultrasonic and hypersonic frequencies by Brillouin scattering measurements over the temperature range between 15 and 300 K. The analysis of the experimental results show that, in addition to thermally activated local motions of structural defects, the vibrational anharmonicity contributes substantially to the temperatures dependences of both the hypersonic loss and velocity. It has been also proved that above 150 K the vibrational anharmonicity appears to be governed by the Akhiezer mechanism of phonon viscosity.

Denna post skapades 2010-01-08. Senast ändrad 2013-10-03.
CPL Pubid: 105944


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