Abstract
Complex dielectric constants have been measured at frequencies from below 20 c/s to 5 mc/s over the temperature range −40° to −75°C in glycerol, −45° to −90° in propylene glycol, and −80° to −140° in n-propanol. The results for n-propanol are described by the Debye equation, but the values for the other two require a modified equation corresponding to a broader range of dispersion at higher frequencies. In all three liquids, evidence is found for a second dispersion region at still higher frequencies, which accounts for much of the difference between the radio frequency and optical dielectric constant. The relaxation times are quantitatively described over wide ranges by an empirical rate equation of a form which also fits viscosity data. The significance of the various results is discussed.
Keywords
DielectricRelaxation (psychology)Dispersion (optics)ViscosityThermodynamicsDebyePropanolChemistryCole–Cole equation1-PropanolRange (aeronautics)Analytical Chemistry (journal)Debye–Hückel equationMaterials sciencePhysical chemistryPhysicsOrganic chemistryOpticsMethanolComposite material
Affiliated Institutions
Related Publications
Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function
The empirical dielectric decay function γ(t)= exp –(t/τ0)β may be transformed analytically to give the frequency dependent complex dielectric constant if β is chosen to be 0.50....
Dispersion and Absorption in Dielectrics I. Alternating Current Characteristics
The dispersion and absorption of a considerable number of liquid and dielectrics are represented by the empirical formula ε*−ε∞=(ε0−ε∞)/[1+(iωτ0)1−α]. In this equation, ε* is th...
Liquid substitution: A versatile procedure for SEM specimen preparation of biological materials without drying or coating
Summary Certain liquids with a very low vapour pressure, such as glycerol or triethylene glycol, can be used to infiltrate biological specimens so that they may be observed in t...
The dielectric properties of some thermoplastics
The paper describes an investigation of the electrical properties of a series of pure thermoplastics, five of them being phenolics prepared by the condensation of phenol, o-, m-...
Theory of Propagation of Elastic Waves in a Fluid-Saturated Porous Solid. I. Low-Frequency Range
A theory is developed for the propagation of stress waves in a porous elastic solid containing compressible viscous fluid. The emphasis of the present treatment is on materials ...
Publication Info
- Year
- 1951
- Type
- article
- Volume
- 19
- Issue
- 12
- Pages
- 1484-1490
- Citations
- 1831
- Access
- Closed
External Links
Social Impact
Altmetric
PlumX Metrics
Social media, news, blog, policy document mentions
Citation Metrics
1831
OpenAlex
Cite This
D. W. Davidson,
Robert H. Cole
(1951).
Dielectric Relaxation in Glycerol, Propylene Glycol, and <i>n</i>-Propanol.
The Journal of Chemical Physics
, 19
(12)
, 1484-1490.
https://doi.org/10.1063/1.1748105
Identifiers
- DOI
- 10.1063/1.1748105