The Complex Dielectric Constant of Liquid Nitrogen in the Region 18 to 26 GHz

1975 ◽  
Vol 53 (23) ◽  
pp. 2611-2612 ◽  
Author(s):  
G. E. Reesor ◽  
I. R. Dagg ◽  
S. Mohabir
Keyword(s):  
Dielectric Constant ◽  
Liquid Nitrogen ◽  
Loss Tangent ◽  
Frequency Region ◽  
Wave Guide ◽  
Complex Dielectric Constant ◽  
Infrared Measurements ◽  
Tan Δ

The complex dielectric constant of liquid nitrogen has been measured by a wave guide method in the frequency region 18 to 26 GHz; ε′ = 1.44 and tan δ = 5 × 10−5. The loss tangent is compared with infrared measurements.

COMPLEX DIELECTRIC CONSTANT OF CIS-DICHLOROETHYLENE IN THE MICROWAVE-FREQUENCY REGION

1967 ◽  
Vol 45 (5) ◽  
pp. 1617-1620
Author(s):  
G. P. Srivastava ◽  
P. C. Mathur
Keyword(s):  
Dielectric Constant ◽  
Dipole Moment ◽  
Relaxation Time ◽  
Dielectric Loss ◽  
Loss Tangent ◽  
Microwave Frequency ◽  
Frequency Region ◽  
Complex Dielectric Constant ◽  
Dilute Solutions ◽  
X Band

The relaxation time and dipole moment of cis-dichloroethylene has been determined in the X-band microwave-frequency region from its dilute solutions in a nonpolar solvent. The dielectric loss tangent δ is found to vary linearly with concentration only for very dilute solutions.

scholarly journals Dielectric Behavior of Dysprosium Substituted Magnesium Ferrite

2018 ◽  
Vol 15 (1) ◽  
pp. 48-54
Author(s):  
Jeevan S. Ghodake
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Powder Diffraction ◽  
Loss Tangent ◽  
Dielectric Loss Tangent ◽  
Dielectric Behavior ◽  
Complex Dielectric Constant ◽  
Frequency Variation ◽  
Magnesium Ferrite ◽  
X Ray

Dysprosium substituted Magnesium ferrite weresuccessfully prepared by chemical combustion method. The as synthesized powder was presintered in air at 6000C for 1hr and finally sintered at 9500C for 1hr. From X-ray powder diffraction pattern of MgDy0.03Fe1.97O4, confirmed formation of single phase cubic spinel structure. The value of crystallite size obtained from X-ray powder diffraction (311) peak , it is found to be 46.38nm.The frequency and temperature variation of dielectric parameters such as real dielectric constant (ε′), complex dielectric constant (ε") and dielectric loss tangent (tanδ) were determined using Hioki LCR - Q meter. The frequency variation of dielectric constant shows a normal dielectric behavior of spinel ferrites. The dielectric loss tangent with frequency shows similar behavior as dielectric constant. The dielectric constant and dielectric loss tangent increases with increase in temperature

scholarly journals CHARGE CARRIERS TRANSPORT AND PERMITTIVITY OF SIO2 FILMS WITH INSB NANOPARTICLES

2020 ◽  
Author(s):  
Pawel Zukowsk ◽  
Tomasz Koltunowicz ◽  
Karolina Czarnacka ◽  
Alexander Fedotov ◽  
Ida Tyschenko
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Phase Angle ◽  
Exponential Decay ◽  
Loss Tangent ◽  
Dielectric Loss Tangent ◽  
Charge Carriers ◽  
Complex Dielectric Constant ◽  
Sio2 Films ◽  
The Real

A.c. current conductivity, capacitance, phase angle and dielectric loss tangent were studied for MOS SOI structures with ion-synthesized in the buried SiO2 layer InSb nanoparticles. Films conductivity nature change was detected at the temperature Т=200К. An exponential decay of the real and imaginary parts of the films complex dielectric constant was found.

Dielectric Loss Measurements on Nonpolar Liquids in the Microwave Region from 18 to 37 GHz

1972 ◽  
Vol 50 (20) ◽  
pp. 2397-2401 ◽  
Author(s):  
I. R. Dagg ◽  
G. E. Reesor
Keyword(s):  
Dielectric Constant ◽  
Carbon Tetrachloride ◽  
Dielectric Loss ◽  
Carbon Disulfide ◽  
Loss Tangent ◽  
Microwave Frequency ◽  
Frequency Region ◽  
Low Loss ◽  
Microwave Region ◽  
Nonpolar Liquids

The results of dielectric-constant measurements on a number of low-loss liquids in the microwave frequency region from 18 to 40 GHz are presented. Emphasis is placed on the value of the loss tangent. Liquids measured include carbon tetrachloride, carbon disulfide, cyclohexane, n-hexane, n-heptane, n-nonane, and n-decane. A wave guide method was used giving an accuracy for the loss tangent of ±0.3 × 10−4. Where possible, results have been fitted to a Debye expression. Comparisons have been made with available results of other workers.

DIELECTRIC PROPERTIES OF Li-Sb FERRITES

2005 ◽  
Vol 19 (18) ◽  
pp. 899-905 ◽  
Author(s):  
SHIVAJI CHONGTHAM ◽  
SUMITRA PHANJOUBAM ◽  
H. N. K. SARMA ◽  
RADHAPIYARI LAISHRAM ◽  
CHANDRA PRAKASH
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Loss Tangent ◽  
Room Temperature ◽  
Substitution Level ◽  
Higher Temperature ◽  
Tan Δ ◽  
Almost All ◽  
Frequency Curves

Dielectric properties such as dielectric constant (ε′) and dielectric loss tangent ( tan δ) of Li 0.5+x Fe 2.5-2x Sb x O 4 ferrites, 0.10≤ x ≤0.30 in steps of 0.05 have been investigated as a function of composition, frequency and temperature. The dielectric constant showed dispersion with frequency in the range of 100 Hz–1 MHz. Peaks were observed in the tan δ versus frequency curves for almost all the samples. The temperature variation of dielectric constant for the different samples was studied at 10 kHz in the temperature range from room temperature to 433 K. Peaks were observed for some of the samples. The peaks were seen to shift towards higher temperature region as the substitution level increases. The mechanisms involved in the processes are discussed in this paper.

Dielectric Loss Measurements on Nonpolar Liquids in the Microwave Region 8 to 12 GHz

1974 ◽  
Vol 52 (1) ◽  
pp. 29-32 ◽  
Author(s):  
I. R. Dagg ◽  
G. E. Reesor
Keyword(s):  
Dielectric Constant ◽  
Carbon Tetrachloride ◽  
Dielectric Loss ◽  
Loss Tangent ◽  
Microwave Frequency ◽  
Frequency Region ◽  
Low Loss ◽  
Microwave Region ◽  
Nonpolar Liquids ◽  
Improved Accuracy

The results of dielectric-constant measurements on a number of low-loss liquids in the microwave frequency region from 8 to 12 GHz are reported. An improved wave-guide technique is described which gives precise values of the real part of the dielectric constant and improved accuracy in determining the dielectric loss. Liquids measured include the alkane series : n-pentane, n-hexane, n-heptane, n-nonane, n-decane, and n-dodecane. Results for cyclohexane and carbon tetrachloride are also given for comparison with those results of other workers. The data for the loss tangent for the alkane series of liquids are compared with previous results in the 18 to 37 GHz region.

Preparation and electrical properties of Ni–Cu–Zn system doped with the magnesium oxide

2014 ◽  
Vol 28 (23) ◽  
pp. 1450157 ◽  
Author(s):  
O. M. Hemeda ◽  
A. Tawfik ◽  
D. M. Hemeda ◽  
A. M. Elsheekh
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Curie Temperature ◽  
Loss Tangent ◽  
Dielectric Loss Tangent ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
Spectra Analysis ◽  
Cationic Distribution ◽  
Tan Δ

A sery of ferrite samples, Ni 0.1 Cu 0.2 Mg x Zn 0.7-x Fe 2 O 4, (x = 0.00, 0.15, 0.25, 0.35, 0.45, 0.55 and 0.70) have been prepared by the standard ceramic techniques, sintered at 1200°C for 2 h, and their crystalline structures were investigated by using X-ray diffraction, which confirmed the formation of Ni 0.1 Cu 0.2 Mg x Zn 0.7-x Fe 2 O 4 phase. The presence of Mg content increases the crystallinity of the given ferrite which is considered as catalyst for the accomplishment of the solid state reaction. The lattice parameter and crystallite size were calculated from XRD. The cationic distribution was estimated from the theoretical values of lattice parameters. The IR spectra analysis has been studied. The dielectric constant for the ferrite system Ni – Cu – Zn gradually increases with temperature up to nearly Curie temperature and then increase sharply beyond the Tc. The Curie temperature obtained from the [Formula: see text] versus T is in agreement with the Curie temperature obtained from other measurements. Dielectric loss tangent ( tan δ) has the same behavior as dielectric constant [Formula: see text]. A minimum value of dielectric loss tangent ( tan δ) for the system " Ni – Cu – Zn " was observed at x = 0.45. Magnetic permeability has been studied. The dependence of initial permeability on temperature exhibit a peak which is called Hopkinson peak (HP) in the vicinity of Curie temperature and confirmed the phase purity of ferrite sample. The increasing of porosity and decreasing of grain size play an important role in decreasing μi. It is clear that the value of Tc is found to increase by increasing the concentration of diamagnetic substitution Mg for " Ni – Cu – Zn " system.

scholarly journals Radio-Frequency Interferometry—A new technique For studying glaciers

1974 ◽  
Vol 13 (67) ◽  
pp. 123-132 ◽  
Author(s):  
D. W. Strangway ◽  
Gene Simmons ◽  
G. Latorraca ◽  
R. Watts ◽  
L. Bannister ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Loss Tangent ◽  
Dipole Antenna ◽  
Western Canada ◽  
Electromagnetic Sounding ◽  
Clear Cut ◽  
Dominant Feature ◽  
Horizontal Electric Dipole ◽  
A New Technique ◽  
Tan Δ

A new method of electromagnetic sounding in resistive electrical environments has been developed for use in lunar exploration. It is applicable to the study of terrestrial glaciers and ice sheets. A horizontal electric dipole antenna on the ground is used to transmit power at frequencies of 1, 2, 4, 8, 16 and 32 MHz. A set of orthogonal receiving coils is mounted on a vehicle which traverses away from the transmitter. Field strength is recorded as a function of distance. Waves which travel above the surface interfere with waves from the subsurface, generating interference patterns which can be used to determine the dielectric constant, the loss tangent, and depth to reflecting horizons.The technique was tested on the Athabasca Glacier in western Canada. At 1, 2 and 4 MHz the ice was found to have a dielectric constant of about 3.3, a loss tangent (tan δ) which is roughly inversely proportional to frequency giving values off tanδ in the range 0.25 to 0.35 (wherefis in MHz). These values correspond well with the known properties of ice near 0° C, which is a temperature typical of temperate glaciers. It has been possible to determine the depth of the ice but results are not always consistent with previous seismic and gravity surveys and with drilling. At frequencies of 16 and 32 MHz, scattering is the dominant feature of the results. At 8 MHz there is a transition from clear-cut interference patterns to the scattering patterns. From these findings, we suggest that the Athabasca Glacier has a large number of dielectric scatterers with dimensions less than about 35 m, probably due in large part to crevasses.

THE DIELECTRIC CONSTANT OF BROMINE AT MICROWAVE FREQUENCIES

1967 ◽  
Vol 45 (7) ◽  
pp. 2349-2354 ◽  
Author(s):  
I. R. Dagg ◽  
G. E. Reesor ◽  
R. P. Doble
Keyword(s):  
Dielectric Constant ◽  
Loss Tangent ◽  
Optical Range ◽  
Frequency Range ◽  
Improved Method ◽  
Microwave Frequencies ◽  
The Real ◽  
Liquid Bromine ◽  
Tan Δ

Measured values of the real part of the dielectric constant, ε′, and the loss tangent, tan δ, of liquid bromine at 20 °C in the frequency range 8.2–18 GHz are presented. The results for tan δ were obtained by a previously described technique; the results for ε′ were obtained by an improved method herein described. A suggested mechanism for absorption is discussed and the results related to static values and values in the optical range.

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