Fast Relaxation in Glasses : Relation to Free Volume and Anharmonicity

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概要

• 論文の詳細を見る

• A model of the quasielastic Raman and neutron scattering in glasses is suggested which is based on coupling of a vibration to a relaxation mode, the coupling originates due to anharmonic effects. Two realizations of the relaxation mode are considered: the first is based on fluctuations of the free volume holes and second is related to fluctuations of the boson peak phonons occupation number. The relaxation strength parameter is expressed through the free volume fraction in the first case and the Grunaisen coefficient in the second one. On the other hand, the numerical values of the fast relaxation and the boson peak parameters are determined from low-frequency Raman spectra of some polymers. A reasonable agreement is obtained between these values and predictions of the model.

• 理論物理学刊行会の論文
• 1997-06-27

著者

• Novikov V

  University Bayreuth Physikalisches Institut : Ia&e Russian Academy Of Sciences

• Novikov Vladimir

  Universityersitat Bayreuth Physikalisches Institut : Institute Of Automation And Electrometry Russia

• NOVIKOV Vladimir

  Universityersitat Bayreuth, Physikalisches Institut : Institute of Automation and Electrometry, Russian Academy of Sciences

• NOVIKOV Vladimir

  University Bayreuth, Physikalisches Institut : IA&E, Russian Academy of Sciences

関連論文

• Fragility as a Measure of Dynamic Inhomogeneity of Glass Formers
• Fast Relaxation in Glasses : Relation to Free Volume and Anharmonicity

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