Journal ArticleDOI
General susceptibility functions for relaxations in disordered systems
TLDR
In this paper, a general equation for the susceptibility of disordered systems is proposed based on the experimental observation of power laws at frequencies far from the peak frequency of the imaginary part of the frequency dependent relaxation function, the susceptibility.Abstract:
A general equation for the susceptibility of disordered systems is proposed. It is based on the experimental observation of power laws at frequencies far from the peak frequency of the imaginary part of the frequency dependent relaxation function, the susceptibility. The obtained general expression contains the equations of other proposed relaxation functions as special cases and, thus, it might be considered as a generalization of these. From this general equation we derive an equation specially adapted for the α relaxation in glass-forming materials. This equation contains only three fit parameters and it is thus very suitable for fitting real experimental data. It is shown that this equation is a good frequency domain representation of the time domain Kohlrausch–Williams–Watts stretched exponential. From the general equation we also derive a four-parameter “universal” equation that describes most types of responses and even inverted response data, i.e., response peaks more stretched on the low frequency side than on the (as is normal) high frequency side. The physical significance of the different parameters is qualitatively discussed and the proposed functions are shown to satisfactorily describe typical experimental data.read more
Citations
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Journal ArticleDOI
Dynamic Mechanical Relaxation in Bulk Metallic Glasses: A Review
TL;DR: In this article, the main and secondary relaxations of metallic glasses are analyzed and the correlation between the atomic mobility and the thermo-mechanical treatments in metallic glasses is analyzed.
Journal ArticleDOI
Dielectric relaxation in dielectric mixtures: Application of the finite element method and its comparison with dielectric mixture formulas
TL;DR: In this paper, the frequency dependent dielectric properties of an ideal binary composite structure were investigated by using the finite element method in the frequency domain, where the material properties of the phases were assumed to be frequency independent and the inclusion phase was more conductive than the matrix phase.
Journal ArticleDOI
Quasielastic neutron scattering and relaxation processes in proteins: analytical and simulation-based models
TL;DR: An overview of analytical and simulation approaches to describe the relaxation dynamics of proteins and recent developments of theoretical models, such as fractional Brownian dynamics, are emphasised.
Journal ArticleDOI
Dielectric and magnetic properties of Nickel ferrite ceramics using crystalline powders derived from DL alanine fuel in sol–gel auto-combustion
TL;DR: In this article, the dielectric and magnetic properties of NiFe2O4 ceramics prepared with powders using DL-alanine fuel in the sol-gel auto combustion technique are studied.
Journal ArticleDOI
The protein glass transition as measured by dielectric spectroscopy and differential scanning calorimetry.
Helén Jansson,Jan Swenson +1 more
TL;DR: For all samples it is clear that several proteins processes are involved in the calorimetric glass transition and the broadness of the transition depends on how much these different relaxations are separated in time.
References
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Journal ArticleDOI
Dispersion and Absorption in Dielectrics I. Alternating Current Characteristics
Kenneth S. Cole,Robert H. Cole +1 more
TL;DR: In this paper, the locus of the dielectric constant in the complex plane was defined to be a circular arc with end points on the axis of reals and center below this axis.
Book
Dielectric relaxation in solids
TL;DR: In this paper, a broad-brush view of dielectric relaxation in solids is presented, making use of the existence of a universality of Dielectric response regardless of a wide diversity of materials and structures with dipolar as well as charge-carrier polarization.
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Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function
Graham Williams,David C. Watts +1 more
TL;DR: In this article, the empirical dielectric decay function γ(t)= exp −(t/τ 0)β was transformed analytically to give the frequency dependent complex dielectrics constant if β is chosen to be 0.50 in the range log(ωτ0) > −0.5.
Journal ArticleDOI
Theory of Electric Polarization
Journal ArticleDOI
A complex plane representation of dielectric and mechanical relaxation processes in some polymers
S. Havriliak,S. Negami +1 more
TL;DR: In this paper, it was shown that the complex deformation of the same data can be represented by a function of same form but with different values for the constants, which can be interpreted as the decay of the distortion with time of the removal of stress field.