A Method for Determining Dielectric Relaxation Times

Mansingh, Abhai; Kumar, Pradip

doi:10.1021/j100782a022

Cited by 5 publications

(3 citation statements)

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“…Again δ and τ cs can be had from eq. (10) as (13) and τ cs 1 ω tan φ (14) Since φ cannot be evaluated directly, a theoretical curve of´1 φ µ log´cosφ µ with φ in degrees was drawn in figure 4 from which (15) can be found out. The known value of´1 φ µ log´cosφ µ was then used to obtain φ .…”

Section: Distribution Parameters γ and δ Related To τ S And τ Csmentioning

confidence: 99%

“…The respective weighted contributions c 1 and c 2 towards dielectric relaxations were also estimated in terms of τ 1 and τ 2 . A graphical method [13] was, soon employed from Fröhlich's distribution function [14] to get τ 2 and τ 1 of a pure polar solute. The methods indicate that a single frequency measurement is not sufficient to have correct τ 1 and τ 2 .…”

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxation phenomena of rigid polar liquid molecules under giga hertz electric field

2001

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The dielectric relaxation phenomena of rigid polar liquid molecules chloral and ethyltrichloroacetate ( j) in benzene, n-hexane and n-heptane (i) under 4.2, 9.8 and 24.6 GHz electric fields at 30 AE C are studied to show the possible existence of double relaxation times τ 2 and τ 1 for rotations of the whole and the flexible parts of molecules. The probability of showing double relaxation is more in aliphatic solvents indicating their nonrigidity. The symmetric and asymmetric distribution parameters γ and δ are obtained from χ

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Section: Distribution Parameters γ and δ Related To τ S And τ Csmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation phenomena of rigid polar liquid molecules under giga hertz electric field

2001

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“…(8) = J.o,,l*oL (12) ( ]3) <r0> : X/~0H.TOL (14) implying only a shift in the pre-exponential factor i.e. a shift in the tunnelling frequency.…”

Section: Tan-lx/rhirl--tan-lx/rl/r Nmentioning

confidence: 99%

A new investigation of dielectric relaxation processes in smoky quartz crystals

Vos

Volger

1967

Physica

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SynopsisDielectric loss measurements on smoky quartz crystals over a wide frequency and temperature range showed, besides the well-known relaxation process at low temperatures, also a new relaxation mechanism, which becomes dominant above 100°K. There are strong arguments that both processes are due to the same type of colour centres. The rate theory in its simplest form cannot be held. The experiments are discussed with the help of Sussmann's theory of intermediate states including tunnelling processes.The deviations of the tan 6 curves from the theoretical Debye curve, due to a spread in relaxation times, were studied. At low temperature there appeared to be a uniform relation between the measured mean value (T) and the experimentally determi~led spread "rn/'rr., defined by the Fr6hlich distribution function g(T) oc r-1 for TL < z < ZH.The upper limit rH has, at constant temperature, a nearly constant value for various samples. The lower limit rL, however, varies by more than a factor 10. At high temperature only a very small spread in, values was found.I. Introduction. Several experimental and theoretical studies have been made in the iield of dielectrics in order to get more insight into the processes which lead to the relaxation of permanent electric dipoles in solids and the interactions which determine the temperature and frequency dependence of the dielectric function.In this paper we will report on the behaviour of the electric dipoles, associated with the colour centres in smoky quartz. The optical and magnetic properties of these colour centres have been studied by many authors in detaill-S). S t e v e 1 s and V o 1 g e r 7) reported the first dielectric measurements. They measured dielectric losses of the Debye type in the temperature range from 16-70°K at low frequencies on both natural smoky quartz and Xirradiated synthetic quartz crystals. They assumed that the electrons trapped at the interstitial ions, thus forming colour centres, also give rise to the high dielectric losses, found in this temperature range. These electrons in association with their trapping centres, which are effectively positively charged, obviously form electric dipoles which at each instant may point

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Metal Complex of the First-Generation Quinolone Antimicrobial Drug Nalidixic Acid: Structure and Its Biological Evaluation

Debnath

Mogha

Masram

2014

Appl Biochem Biotechnol

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A novel binuclear squire planar complex of nalidixic acid with Ag(I) metal ion with the formula [Ag(Nal)2] has been synthesized. The synthesized metal complex was characterized using CHN analysis, Fourier-transformed infra-red (FT-IR), thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC), ultra violet-visible (Uv-vis) and single-crystal X-ray diffraction (XRD). The newly synthesized complex shows more advanced antifungal activity compared to the parent quinolone against four fungi, namely Pythium aphanidermatum, Sclerotinia rolfsii, Rhizoctonia solani and Rhizoctonia bataticola.

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A Method for Determining Dielectric Relaxation Times

Cited by 5 publications

References 0 publications

Dielectric relaxation phenomena of rigid polar liquid molecules under giga hertz electric field

Dielectric relaxation phenomena of rigid polar liquid molecules under giga hertz electric field

A new investigation of dielectric relaxation processes in smoky quartz crystals

Metal Complex of the First-Generation Quinolone Antimicrobial Drug Nalidixic Acid: Structure and Its Biological Evaluation

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