Dedicated to Prof. Wolfgang Eisenmenger on the occasion of his 65th birthday
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- Referenz
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- Seitenbereich
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0091 - 0098
- Schlagwort(e)
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<KWD>Structural relaxation
High pressure
Hypersound absorption
Polymorphism in glasses
Sound velocity
- Zusammenfsg.
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The pressure dependence of Brillouin spectra of vitreous silica exhibits a maximum in the hypersonic absorption and a minimum in the sound velocity at about 2 GPa almost independent of temperature. The results are discussed on the basis of relaxing defects residing in double-well potentials with a Gaussian distribution of barrier heights and a Lorentzian distribution in the asymmetry. Our analysis suggests that both the distribution functions are strongly changed at higher pressures. It is striking that a phase boundary between α-quartz and coesite exists just at the pressure where absorption and sound velocity of vitreous silica pass their extremum. This might be a hint that a corresponding structural change also occurs in the glass.
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