Low frequency Raman and Brillouin scattering experiments in yttrium and lanthanide metaphosphate glasses have been carried out over a wide range of temperature from liquid helium to the glass transition temperature (Tg≅ 900 K). Analysis of the Raman data together with complementary low temperature specific heat and ultrasonic velocity results reveals that the temperature and frequency dependences of the quasi-elastic scattering and Boson peak and in addition the anomalous low temperature specific heat, are in qualitative agreement with the predictions of the soft potential model.
Soft vibrational modes in yttrium and lanthanide metaphosphate glasses
D'ANGELO, Giovanna;CARINI, Giuseppe;TRIPODO, Gaspare;
1996-01-01
Abstract
Low frequency Raman and Brillouin scattering experiments in yttrium and lanthanide metaphosphate glasses have been carried out over a wide range of temperature from liquid helium to the glass transition temperature (Tg≅ 900 K). Analysis of the Raman data together with complementary low temperature specific heat and ultrasonic velocity results reveals that the temperature and frequency dependences of the quasi-elastic scattering and Boson peak and in addition the anomalous low temperature specific heat, are in qualitative agreement with the predictions of the soft potential model.File in questo prodotto:
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