Anharmonicity of quasi-lattice vibrations in glasses of the As(Sb)-O-I(Br, Cl) system in the framework of the fluctuation hole model

Parameters of the free volume theory (such as the fraction of the fluctuation free volume, the hole volume, the energy of hole formation, and the maximum internal pressure) are calculated from the experimental data on the density, microhardness, glass transition temperature, and longitudinal and tra...

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Bibliographic Details
Published in:	Glass physics and chemistry Vol. 28; no. 6; pp. 365 - 372
Main Authors:	MEL'NICHENKO, T. N, YURKIN, I. M, FEDELESH, V. I, KOTSAK, Ya. Ya, KUTSENKO, Ya. P, PUGA, P. P
Format:	Journal Article
Language:	English
Published:	Moscow Kluwer/Plenum 01-11-2002 New York, NY Nauka/Interperiodica Springer Nature B.V
Subjects:	Anharmonicity Density Fluctuation Glass Mathematical models Microhardness Strain Vibration
Online Access:	Get full text
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Summary:	Parameters of the free volume theory (such as the fraction of the fluctuation free volume, the hole volume, the energy of hole formation, and the maximum internal pressure) are calculated from the experimental data on the density, microhardness, glass transition temperature, and longitudinal and transverse ultrasonic velocities. The anharmonicity of particle vibrations and the nonlinearity of interatomic interaction forces in vitreous oxides and oxyhalides are considered in the framework of the free volume concept. The relation of the critical strains of the interatomic bonds and the volume strain of the glass network to the lattice Grüneisen parameter is analyzed. The quantities calculated from the thermodynamic Grüneisen equation with the formulas relating the Grüneisen parameter to the Poisson ratio and the fraction of the fluctuation free volume are compared with those determined from the dependences of the elastic modulus on microhardness. A correlation between the parameters of the free volume model and the models based on modern structural concepts of inorganic glasses is discussed.[PUBLICATION ABSTRACT]
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1087-6596 1608-313X
DOI:	10.1023/A:1021710715751