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Anharmonicity of acoustic modes in vitreous TeO2

The temperature dependences between 298 and 358 K of the third-order elastic constants of vitreous TeO2 have been determined from measurements of hydrostatic and uniaxial pressure dependences of ultrasonic wave velocities. The results show that the vibrational anharmonicity of the long-wavelength ac...

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Main Authors: Benbattouche, N., Saunders, George A., Ab. Aziz, Sidek
Format: Article
Language:English
Published: Taylor & Francis 1989
Online Access:http://psasir.upm.edu.my/id/eprint/39520/1/Anharmonicity%20of%20acoustic%20modes%20in%20vitreous%20TeO2.pdf
http://psasir.upm.edu.my/id/eprint/39520/
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spelling my.upm.eprints.395202015-08-10T03:52:47Z http://psasir.upm.edu.my/id/eprint/39520/ Anharmonicity of acoustic modes in vitreous TeO2 Benbattouche, N. Saunders, George A. Ab. Aziz, Sidek The temperature dependences between 298 and 358 K of the third-order elastic constants of vitreous TeO2 have been determined from measurements of hydrostatic and uniaxial pressure dependences of ultrasonic wave velocities. The results show that the vibrational anharmonicity of the long-wavelength acoustic modes in this glass is almost independent of temperature in this range. To examine further the effect of anharmonicity of these modes, the second-order elastic constants have been measured down to 4·2 K. A linear dependence found for C11 and C44 between about 80 and 358 K is consistent with the anharmonic contribution causing the temperature dependence of elastic properties in the usual way. Below 80 K, C11 and C44 exhibit anomalous increases whose behaviour and magnitudes are consistent with a contribution from relaxation interactions with two-level systems to the elastic properties of vitreous TeO2 similar to those found in other glasses. Taylor & Francis 1989 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/39520/1/Anharmonicity%20of%20acoustic%20modes%20in%20vitreous%20TeO2.pdf Benbattouche, N. and Saunders, George A. and Ab. Aziz, Sidek (1989) Anharmonicity of acoustic modes in vitreous TeO2. Philosophical Magazine Part B, 60 (5). pp. 643-657. ISSN 1364-2804
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description The temperature dependences between 298 and 358 K of the third-order elastic constants of vitreous TeO2 have been determined from measurements of hydrostatic and uniaxial pressure dependences of ultrasonic wave velocities. The results show that the vibrational anharmonicity of the long-wavelength acoustic modes in this glass is almost independent of temperature in this range. To examine further the effect of anharmonicity of these modes, the second-order elastic constants have been measured down to 4·2 K. A linear dependence found for C11 and C44 between about 80 and 358 K is consistent with the anharmonic contribution causing the temperature dependence of elastic properties in the usual way. Below 80 K, C11 and C44 exhibit anomalous increases whose behaviour and magnitudes are consistent with a contribution from relaxation interactions with two-level systems to the elastic properties of vitreous TeO2 similar to those found in other glasses.
format Article
author Benbattouche, N.
Saunders, George A.
Ab. Aziz, Sidek
spellingShingle Benbattouche, N.
Saunders, George A.
Ab. Aziz, Sidek
Anharmonicity of acoustic modes in vitreous TeO2
author_facet Benbattouche, N.
Saunders, George A.
Ab. Aziz, Sidek
author_sort Benbattouche, N.
title Anharmonicity of acoustic modes in vitreous TeO2
title_short Anharmonicity of acoustic modes in vitreous TeO2
title_full Anharmonicity of acoustic modes in vitreous TeO2
title_fullStr Anharmonicity of acoustic modes in vitreous TeO2
title_full_unstemmed Anharmonicity of acoustic modes in vitreous TeO2
title_sort anharmonicity of acoustic modes in vitreous teo2
publisher Taylor & Francis
publishDate 1989
url http://psasir.upm.edu.my/id/eprint/39520/1/Anharmonicity%20of%20acoustic%20modes%20in%20vitreous%20TeO2.pdf
http://psasir.upm.edu.my/id/eprint/39520/
_version_ 1643832445510877184
score 13.211869

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