Now showing items 1-10 of 1404
Light scattering study of the glass transition in salol
(American Physical Society, 1989)
We have performed photon correlation spectroscopy experiments to measure the lifetimes of density fluctuations in liquid salol in both the normal and supercooled regimes down to its glass transition at -55 °C. Two modes ...
Dimensionality dependence of the conductivity dispersion in ionic materials
(American Physical Society, 1999)
The dielectric response of many materials exhibits universal behavior in the form of a power law frequency dependence of the ac conductivity. This response is seen in all types of structures both crystalline and amorphous ...
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Dynamic light scattering study of nonexponential relaxation in supercooled 2Ca(NO3)2_ʀ3KNO3
(American Institute of Physics, 1989)
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 ...
Regarding the correlation of nuclear spin relaxation and electrical conductivity relaxation in ionic glasses
(American Institute of Physics, 1998)
Much attention has been focused recently on the apparent differences between ion dynamics in ion-containing glasses as probed by electrical conductivity relaxation (ECR) and by nuclear spin relaxation (NSR) techniques. In ...
Anomalous-diffusion model of ionic transport in oxide glasses
(American Physical Society, 1995)
The power-law frequency dependence of both the conductivity, σ(ω), and permittivity, ɛ(ω), of ion-conducting materials suggests that self-similar or scale-invariant behavior influences the transport of ions at high ...
Two-step relaxation decay in a strong glass former
(American Physical Society, 1993)
The dynamics around the liquid-glass transition in B2O3 have been investigated by photon correlation spectroscopy. A two-step relaxation is for the first time observed in a ‘‘strong’’ network forming glass. The behavior ...
Scaling parallels in the non-Debye dielectric relaxation of ionic glasses and dipolar supercooled liquids
(American Physical Society, 1997)
We compare the dielectric response of ionic glasses and dipolar liquids near the glass transition. Our work is divided into two parts. In the first section we examine ionic glasses and the two prominent approaches to ...
Light-scattering studies of a ternary mixture: Comparison of field variables for critical phenomena description
(American Institute of Physics, 1988)
We present static turbidity and dynamic light‐scattering measurements near the critical double point of a mixture of secondary butyl alcohol, tertiary butyl alcohol, and water. At the critical double point of this mixture ...
Increased radiative lifetime of rare earth-doped zinc oxyhalide tellurite glasses
(American Institute of Physics, 1997)
We have investigated the structural and optical properties of rare earth-doped zinc tellurite glasses modified by the substitution of ZnF2. Raman and phonon sideband spectroscopies were employed to characterize changes in ...