Acoustic behaviour of normal and densified vitreous GeO<sub>2</sub>

Carini, G.; Orsingher, L.; Tripodo, G.; Gilioli, E.

doi:10.1080/14786430802247205

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…Evaluation of the relaxor number N (

{CH}_{2}^{} italic

{CH}_{2}^{} italic

CH 3 side polar groups) leads to assess the coupling constant γ and the dipole moment p 0 , whose values are in agreement with those generally observed in amorphous polymers and glasses …”

Section: Resultssupporting

confidence: 70%

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Carini

D’Angelo

et al. 2017

J Polym Sci B Polym Phys

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The specific role of acetonitrile and methoxypropionitrile, as accelerators of the relaxation dynamics of polyvinyl butyral (PVB), was investigated in polymer/additive mixtures with a saturation liquid content. The aim was to improve the ionic mobility of PVB‐based solid electrolytes to be used in solid dye‐sensitized solar cells. Mechanical and dielectric relaxation measurements between 120 K and 380 K revealed that the α‐relaxation observed above 330 K in dry‐PVB is shifted quite below room temperature in PVB/additives. Both the additives cause a growing intermolecular cooperativity, the sub‐glass β‐relaxation exhibiting a strength enhanced by a factor 3 and a frequency factor which increases from 1015 s−1 to 1021 s−1. This discloses an activation entropy as high as 165.7 J/K mol in comparison to 40.8 J/K mol in dry‐PVB. It is suggested the existence of cooperative transitions, mainly driven by bridges formed through additive molecules, which influence both short‐ and long‐scale segmental motions and also favor the ion dynamics in PVB/additive/electrolyte systems. The room temperature ionic conductivity σrt exhibits large changes from 6.4*10−14 S/m in dry PVB, through 1.5*10−8 S/m in PVB/LiI, to 2.45*10−5 S/m in PVB/MPN/LiI. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 340–346

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“…Evaluation of the relaxor number N (

{CH}_{2}^{} italic

{CH}_{2}^{} italic

CH 3 side polar groups) leads to assess the coupling constant γ and the dipole moment p 0 , whose values are in agreement with those generally observed in amorphous polymers and glasses …”

Section: Resultssupporting

confidence: 70%

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Carini

D’Angelo

et al. 2017

J Polym Sci B Polym Phys

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“…5. The plateau of the 6.3 kHz data [51] agrees with the tunneling prediction, but the plateau of longitudinal ultrasonic data [52,53] is markedly higher, in agreement with the soft potential calculation. Again, the C l -value determined from the 80 MHz sound velocity change at low temperature [52] is only compatible with the measured plateau height in the soft potential model, not in the tunneling model.…”

Section: A the Crossover From Tunneling To Classical Relaxationsupporting

confidence: 81%

Sound absorption in glasses

Buchenau¹,

D’Angelo²,

Carini³

et al. 2020

Preprint

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“…It must be noted that the small contribution of TLS to Q −1 was calculated from parameters extracted from the literature. 25,28 This contribution is shown in Fig. 4 as a thin black line and was added to the calculated TAR value to allow comparison with experiment.…”

Section: Discussionmentioning

confidence: 99%

Acoustic damping and dispersion in vitreous germanium oxide

2012

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New Brillouin scattering measurements of velocity and attenuation of sound in the hypersonic regime are presented. The data are analyzed together with the literature results at sonic and ultrasonic frequencies. As usual, thermally activated relaxation of structural entities describes the attenuation at sonic and ultrasonic frequencies. As already shown in vitreous silica, we conclude that the damping by network viscosity, resulting from relaxation of thermal phonons, must be taken into account to describe the attenuation at hypersonic frequencies. In addition, the bare velocity obtained by subtracting to the experimental data the effect of the two above mechanisms is constant for temperatures below 250 K, but increases almost linearly above, up to the glass transition temperature. This might indicate the presence of a progressive local polyamorphic transition, as already suggested for vitreous silica.Comment: 14 pages, 8 figure

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Acoustic behaviour of normal and densified vitreous GeO₂

Cited by 12 publications

References 20 publications

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Sound absorption in glasses

Acoustic damping and dispersion in vitreous germanium oxide

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Acoustic behaviour of normal and densified vitreous GeO2

Cited by 12 publications

References 20 publications

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Enhancing the molecular cooperativity of polyvinyl butyral using liquid additives

Sound absorption in glasses

Acoustic damping and dispersion in vitreous germanium oxide

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Product

Resources

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Acoustic behaviour of normal and densified vitreous GeO₂