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Third order elastic constants and vibrational anharmonicity of a semiconducting iron phosphate glass

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
44
Issue
1
Identifiers
DOI: 10.1016/0022-3093(81)90140-x

Abstract

Abstract From measurements of changes in transit time of 10 MHz ultrasonic waves as a function of hydrostatic and uniaxial stresses, the third order elastic constant of (Fe 2O 3) 0.38(P 2O 5) 0.62 glass have been determined. The vibrational behaviour of this glass lies intermediate between those of the amorphous form of arsenic and the anomalies characteristics of the silica glasses. The pressure derivative of the bulk modulus ( ∂B S/ ∂P) P=0 is positive (+4.73) but that of the shear modulus ( ∂μ/ ∂P) P=0 is negative (−0.16): the Grüneisen mode gamma γ 1 for longitudinal modes is +1.1 while γ t for transverse modes is −0.3 - under pressure the longitudinal modes stiffen in the usual way but the shear modes soften. To examine the effects of vibrational anharmonicity on the phonon dynamics of a phosphate glass, the displacement amplitudes for the scattered waves in the long wavelength limit have been computed for the possible types of three-phonon interactions.

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