Dielectric Relaxation in Composite Systems

1995 ◽  
Vol 411 ◽  
Author(s):  
Frederick I. Mopsik
Keyword(s):  
Composite Material ◽  
Dielectric Relaxation ◽  
Polymeric Materials ◽  
Wide Frequency Range ◽  
Relaxation Phenomena ◽  
Large Role ◽  
Frequency Range ◽  
Phase Boundaries ◽  
Composite Systems ◽  
Liquid Solutions

ABSTRACTDielectric relaxation phenomena have contributions from both the internal reorientation modes of the molecules comprising a material as well as the details of how those modes couple together to form the material. This behavior can change quite sensitively with changes in the composition of material. For a composite material that has more than one phase, the presence of phase boundaries and even shape can play an additional and large role in the observed relaxation behavior. Analysis of the relaxation spectra can be used to study these effects. Examples are shown, primarily of polymeric materials, ranging from liquid solutions to phase separated mixtures to show how dielectric relaxation over a wide frequency range can be used to characterize and study composite materials.

scholarly journals Dielectric relaxation of nonaqueous ionic liquid microemulsions: polarization, microstructure, and phase transition

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13733-13741 ◽  
Author(s):  
Cancan Zhang ◽  
Zhen Zhen ◽  
Liyan Ma ◽  
Kongshuang Zhao
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Dielectric Relaxation ◽  
Dielectric Spectroscopy ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
40 Hz

Two nonaqueous ionic liquid (IL) microemulsions (toluene/TX-100/[bmim][PF6] and [bmim][BF4]/TX-100/benzene) were studied by dielectric spectroscopy covering a wide frequency range (40 Hz to 110 MHz).

scholarly journals DIELECTRIC RELAXATION PHENOMENA IN PARAELECTRIC PHASE OF NANOCRYSTALLINE-TRIGLYCINE SULFATE COMPOSITE

2020 ◽  
Vol 38 (02) ◽  
Author(s):  
NGUYEN HOAI THUONG ◽  
MAI BICH DUNG ◽  
TRAN THANH NGOC ◽  
NGUYEN THI LAN HUONG ◽  
NGUYEN THI KIM ANH ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Dielectric Relaxation ◽  
Paraelectric Phase ◽  
Triglycine Sulfate ◽  
Weak Electric Field ◽  
Relaxation Phenomena ◽  
Frequency Range ◽  
Slowing Down

The aim of this work is to clarify dielectric relaxation phenomena in paraelectric phase of composites based on nanocrystalline cellulose and triglycine sulfate. Although the dielectric properties of this material were almost thoroughly investigated, but there has been no study devoted to relaxation anomalies in paraelectric phase. The results showed the presence of Debye-like relaxation at the entire studied frequency range 103 – 106 Hz under a weak electric field of 1 V.m-1 from phase transition temperature in the composite (54 ˚C) to 90 ˚C. In addition, the phenomena were observed at lower frequencies as compared to those of triglycine sulfate single crystals. The results were explained by the assumption based on critical slowing down occurred in the nanoparticles in the composite.

Application of fractional calculus to the modeling of dielectric relaxation phenomena in polymeric materials

2005 ◽  
Vol 98 (2) ◽  
pp. 923-935 ◽  
Author(s):  
E. Reyes-Melo ◽  
J. Martinez-Vega ◽  
C. Guerrero-Salazar ◽  
U. Ortiz-Mendez
Keyword(s):  
Fractional Calculus ◽  
Dielectric Relaxation ◽  
Polymeric Materials ◽  
Relaxation Phenomena

Installation for testing electronic voltmeters over a wide frequency range

1976 ◽  
Vol 19 (10) ◽  
pp. 1525-1526
Author(s):  
A. M. Fedorov ◽  
V. V. Krestovskii ◽  
V. S. Kiselev ◽  
S. A. Razumovskii ◽  
V. A. Shcheglov
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range

High Frequency Dielectric Response of the Ionic Liquid N-Methyl-N-ethylpyrrolidinium Dicyanamide

2007 ◽  
Vol 60 (1) ◽  
pp. 6 ◽  
Author(s):  
Simon Schrödle ◽  
Gary Annat ◽  
Douglas R. MacFarlane ◽  
Maria Forsyth ◽  
Richard Buchner ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
High Frequency ◽  
Dielectric Response ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Dielectric Relaxation Spectroscopy ◽  
Frequency Range ◽  
Fast Rotation

A study of the room-temperature ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide by dielectric relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addition to the already known lower frequency processes, there is a broad featureless dielectric loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the IL relative to each other, with additional contributions from their fast rotation.

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