Automatic measurement of dielectric constant and loss angle over a continuous frequency range

1967 ◽  
Vol 10 (5) ◽  
pp. 6-8
Author(s):  
M. A. Akhmamet'ev ◽  
S. M. Kazakov
Keyword(s):  
Dielectric Constant ◽  
Automatic Measurement ◽  
Loss Angle ◽  
Frequency Range ◽  
Dielectric Constant And Loss ◽  
Continuous Frequency

scholarly journals STRUCTURAL AND DIELECTRIC PROPERTIES OF GLASSES IN THE SYSTEM TeO2–CaCu3Ti4O12

2012 ◽  
Vol 02 (04) ◽  
pp. 1250020 ◽  
Author(s):  
P. THOMAS ◽  
K. B. R. VARMA
Keyword(s):  
Dielectric Constant ◽  
Electric Modulus ◽  
Differential Scanning Calorimetric ◽  
Frequency Range ◽  
Low Loss ◽  
Modulus Formalism ◽  
X Ray ◽  
Dielectric Constant And Loss ◽  
Frequency Independent ◽  
Electric Modulus Formalism

The glasses in the system (100 - x) TeO2 –x CaCu3Ti4O12 , (x = 0.25 mol. % to 3 mol.%) were fabricated. The color varied from olive green to brown as the CaCu3Ti4O12 (CCTO) content increased in TeO2 matrix. The X-ray powder diffraction and differential scanning calorimetric analyses that were carried out on the as-quenched samples confirmed their amorphous and glassy nature respectively. The dielectric constant and loss in the 100 Hz–1 MHz frequency range were monitored as a function of temperature (50–400°C). The dielectric constant [Formula: see text] and the loss (D) increased as the CCTO content increased in TeO2 at all the frequencies and temperatures under investigation. Further, the [Formula: see text] and D were found to be frequency-independent in the 50–200°C temperature range. The value obtained for the loss at 1 MHz was 0.0019 which was typical of low loss materials, and exhibited near constant loss (NCL) in the 100 Hz–1 MHz frequency range. The electrical relaxation was rationalized using the electric modulus formalism. These glasses may be of considerable interest as substrates for high frequency circuit elements in conventional semiconductor industries owing to their high thermal stability.

Application of the Measurement of the Dielectric Constant and Loss Angle to the Study of the Structure of Vulcanizates Loaded with Carbon Blacks

1952 ◽  
Vol 25 (3) ◽  
pp. 533-548
Author(s):  
P. Thirion ◽  
R. Chasset
Keyword(s):  
Dielectric Constant ◽  
Carbon Black ◽  
The Other ◽  
Rubber Matrix ◽  
Loss Angle ◽  
Colloidal Structure ◽  
Dielectric Absorption ◽  
Dielectric Loss Angle ◽  
Dielectric Constant And Loss ◽  
The Matrix

Abstract In the case of vulcanizates containing carbon black the variation curves of dielectric loss angle as a function of temperature enable the Debye type absorption occurring in the rubber matrix to be distinguished from a supplementary absorption little influenced by variations in temperature and frequency which is characteristic of blacks possessing a structure. The experimental results obtained indicate no difference in physical or chemical state between the matrix occupying the space between the particles of black in a loaded mix and the vulcanizate of the corresponding pure rubber mix. The supplementary losses on the other hand seem to be closely related to the effects of structure in loaded mixes imagined by Mullins to explain the mechanical behavior of these mixes: they decrease very rapidly by elongation or swelling and give rise to various phenomena of hysteresis. It would seem that dielectric absorption could advantageously be applied as a nondestructive test revealing the colloidal structure of rubber mixes based on carbon black. Moreover the dielectric constant would enable information to be obtained on the form factor and the orientation of the particles or agglomerates of particles of black in mixes on the basis of a theory assimilating these particles (or agglomerates) to condenser armatures.

Photokapazitiver Effekt und Lumineszenz unter IR-Bestrahlung

1964 ◽  
Vol 19 (4) ◽  
pp. 454-458 ◽  
Author(s):  
Frank Matossi ◽  
Dieter Siebert
Keyword(s):  
Dielectric Constant ◽  
Energy Band ◽  
Infrared Radiation ◽  
Band Model ◽  
Loss Angle ◽  
Capacitance Change ◽  
Effect Change ◽  
Conduction Electrons ◽  
Dielectric Constant And Loss ◽  
Uv Excitation

The photocapacitive effect (change of dielectric constant and loss angle by uv-radiation) is modified by additional infrared radiation either during or after uv excitation. This is investigated in some detail for a phosphor with photodielectric effect where the capacitance change is essentially due to polarization of filled traps. There are indications for the influence of reversible occupation changes among traps. Results with a phosphor whose capacitance change is due to conduction electrons are not yet conclusive with respect to a detailed energy band model; they show, however, that both conduction band and valence band participate in the processes.

Permittivity and Dielectric Relaxations in Liquid-Ammonia Solutions

1970 ◽  
Vol 25 (10) ◽  
pp. 1467-1471 ◽  
Author(s):  
K. G. Breitschwerdt ◽  
W. Schmidt
Keyword(s):  
Dielectric Constant ◽  
Liquid Ammonia ◽  
Total Concentration ◽  
Ion Pairs ◽  
Alkali Halides ◽  
Frequency Range ◽  
Special Model ◽  
Dielectric Relaxations ◽  
Dielectric Constant And Loss ◽  
Solvent Molecules

Abstract Dielectric constant and loss in liquid-ammonia solutions of alkali halides have been measured in the frequency range 0.7 - 70 GHz. At least one relaxation process exists in this frequency range in addition to the relaxation of the solvent molecules. The additional relaxation is ascribed to the orientational polarisation of ion pairs. The concentration of the ion pairs, calculated with a special model, is 30 - 50% of the total concentration. The interaction between ions and solvent molecules is discussed.

Low Temperature Hydrothermal Synthesis and Sintering of Ba0.6Sr0.4TiO3

2008 ◽  
Vol 368-372 ◽  
pp. 53-55
Author(s):  
Yun Fei Fu ◽  
Pei Feng Zhang ◽  
Hui Qing Fan ◽  
Xiu Li Chen
Keyword(s):  
Dielectric Constant ◽  
Low Temperature ◽  
Room Temperature ◽  
Hydrothermal Process ◽  
Dielectric Anomaly ◽  
Loss Angle ◽  
Synthesis Mechanism ◽  
Dielectric Constant And Loss ◽  
Different Temperatures ◽  
Bst Ceramics

Ba0.6Sr0.4TiO3 nanopowders (~ 80 nm in size) were prepared by low temperature hydrothermal process. The process and synthesis mechanism were discussed in detail. Furthermore, the powders were pressed into disc-shaped pellets and sintered at different temperatures. The frequency dependence of the dielectric constant and loss angle tangent of the sintered BST ceramics are measured from room temperature to 500°C and a diffuse dielectric anomaly by the dielectric relaxation was found.

THE DIELECTRIC PROPERTIES OF SELECTED BASALTS

Geophysics ◽  
1973 ◽  
Vol 38 (1) ◽  
pp. 135-139 ◽  
Author(s):  
W. Hansen ◽  
W. R. Sill ◽  
S. H. Ward
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Loss Tangent ◽  
Room Temperature ◽  
Frequency Dispersion ◽  
Nitrogen Atmosphere ◽  
Frequency Range ◽  
Dielectric Constant And Loss ◽  
Identical Composition ◽  
Titanium Compounds

Basaltic samples of known chemical composition were measured for dielectric constant and loss tangent in the frequency range 100 hz to 50 Mhz. All samples were prepared and measured by a contact substitution method in a dry nitrogen atmosphere at room temperature. The measurements indicated a general spectrum of dielectric constant with a range of 10–65 at 100 hz to 7–15 at 50 Mhz with frequency dispersion observed to be minimal above 1 Mhz. The loss tangent decreases from a range .2–.9 at 100 hz to a range .02–.15 at 100 khz. A finer‐grained sample was observed to have higher dielectric properties below 1 Mhz than a coarser‐grained sample of identical composition. A qualitative and subsequent quantitative study of possible compositional effects indicated that iron‐titanium compounds may be responsible for observed variations in the dielectric spectra of typical basalts.

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