DOI: 10.1063/1.457331. Dynamic light scattering study of nonexponential relaxation in supercooled 2Ca(NO3)2⋅3KNO3

Dynamic light scattering study of nonexponential relaxation in supercooled 2Ca(NO3)2⋅3KNO3

10.1063/1.457331

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

We have performed depolarized dynamic light scattering (photon correlation) measurements on the ionic glass forming mixture 2Ca(NO3)2⋅3KNO3 above its glass transition in the temperature range 68–86 °C. We find the relaxation function is a stretched exponential. The average relaxation time follows an Arrhenius temperature dependence and can be related to motions on a molecular scale. The width parameter β does not vary with temperature and is β=0.40±0.05. Combination of our β data with other literature values shows that β evolves with temperature over a larger range. At high temperature, β crosses over from β=1 to β&lt;1 at a temperature which matches well with where the viscosity first deviates from a power law behavior. β then evolves downward with lowering temperature and then settles at 0.4 roughly 30 °C above the glass transition Tg. This behavior corresponds well with recent theory relating the glass transition to the ramification of phase space but it implies that the percolation of phase space occurs well above Tg.

Bibliography

Sidebottom, D. L., & Sorensen, C. M. (1989). Dynamic light scattering study of nonexponential relaxation in supercooled 2Ca(NO3)2â3KNO3. The Journal of Chemical Physics, 91(11), 7153â7158.

Authors 2

D. L. Sidebottom (first)
C. M. Sorensen (additional)

References 30 Referenced 33

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:12 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 5:55 a.m.)
Indexed	1 year, 2 months ago (June 28, 2024, 8:06 p.m.)
Issued	35 years, 9 months ago (Dec. 1, 1989)
Published	35 years, 9 months ago (Dec. 1, 1989)
Published Print	35 years, 9 months ago (Dec. 1, 1989)

Funders 0

None

BibTeX

@article{Sidebottom_1989, title={Dynamic light scattering study of nonexponential relaxation in supercooled 2Ca(NO3)2⋅3KNO3}, volume={91}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.457331}, DOI={10.1063/1.457331}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Sidebottom, D. L. and Sorensen, C. M.}, year={1989}, month=dec, pages={7153–7158} }

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  "abstract": "<jats:p>We have performed depolarized dynamic light scattering (photon correlation) measurements on the ionic glass forming mixture 2Ca(NO3)2\u22c53KNO3 above its glass transition in the temperature range 68\u201386\u2009\u00b0C. We find the relaxation function is a stretched exponential. The average relaxation time follows an Arrhenius temperature dependence and can be related to motions on a molecular scale. The width parameter \u03b2 does not vary with temperature and is \u03b2=0.40\u00b10.05. Combination of our \u03b2 data with other literature values shows that \u03b2 evolves with temperature over a larger range. At high temperature, \u03b2 crosses over from \u03b2=1 to \u03b2&amp;lt;1 at a temperature which matches well with where the viscosity first deviates from a power law behavior. \u03b2 then evolves downward with lowering temperature and then settles at 0.4 roughly 30\u2009\u00b0C above the glass transition Tg. This behavior corresponds well with recent theory relating the glass transition to the ramification of phase space but it implies that the percolation of phase space occurs well above Tg.</jats:p>",
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