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# IEEE Transactions on Dielectrics and Electrical Insulation

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Displaying Results 1 - 25 of 47
• ### DC conductivity of metal/DLC/Si/metal heterostructures

Publication Year: 2001, Page(s):418 - 421
Cited by:  Papers (6)  |  Patents (1)
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Electrical conduction of metal/DLC/silicon/metal heterostructures has been investigated, Both DLC/p-Si and DLC/n-Si systems shows rectifying properties. The current-voltage (I-V) characteristics of the heterostructures can be described well by the simplified diode equation with the ideality factor between 21.2 and 3.25, decreasing with increasing temperature. The directive tendency of I-V characte... View full abstract»

• ### Dielectric response of ionically conducting liquids in the low-frequency region

Publication Year: 2001, Page(s):413 - 417
Cited by:  Papers (2)
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The selected dielectric studies are presented of ionically conducting materials (liquid crystal, epoxide resin) in the range of time, 10-4 to 104 s, or frequency, 10-4 to 104 Hz. The properties of the space charge at the blocking electrodes were taking into account. Investigations were focused on the time domain dielectric response of the model liquid cr... View full abstract»

• ### Electrical conductivity in thin layers of chitosan and chitosan acetate

Publication Year: 2001, Page(s):411 - 412
Cited by:  Papers (2)
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The present work is concerned with experimental results on the electrical conductivity of chitosan and chitosan acetate in the temperature range 20 to 325 K, and a broad range of electric field strength. The thickness of the layers was ~15 μm. The influence of the internal structure on electrical properties was observed. The mechanism of the electrical conductivity was controlled by the Poole-F... View full abstract»

• ### Behavior of the discrete energy states

Publication Year: 2001, Page(s):461 - 468
Cited by:  Papers (1)
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A study comparing composite thermally stimulated current (TSC) curves that usually are measured by the single heating method, and partial curves from repeated heating and cooling processes, is reported. For this purpose, both the auto-separation (As) and reconstruction (Re) methods are necessary. The former enables us to separate accurately composite curves obtained by one heating process into sev... View full abstract»

• ### Electrical conduction of thin 1,4-cis-polybutadiene films

Publication Year: 2001, Page(s):406 - 410
Cited by:  Papers (2)
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This work contains results on the internal structure and dc conduction of 1,4-cispolybutadiene. X-ray and thermally stimulated depolarization (TSD) studies have been a source of information on phase transitions in the investigated material. The conduction measurements have been performed on thin films of thickness varying from 1 to 10 μm. Gold and aluminum have been applied as electrodes. The t... View full abstract»

• ### Energy criterion in interacting cluster systems

Publication Year: 2001, Page(s):352 - 358
Cited by:  Papers (18)
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The high-frequency fractional power law of relaxation, seen in a wide range of materials, yields a constant ratio of the macroscopic energy lost per radian to the energy stored in the system, in the corresponding frequency range. For almost two decades, the above energy criterion has been supposed to imply the existence of similar microscopic properties which determine the observed power-law expon... View full abstract»

• ### Effect of water inclusions on charge transport and polarization in porous media

Publication Year: 2001, Page(s):454 - 460
Cited by:  Papers (8)
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Wideband dielectric spectroscopy measurements (100 Hz to 10 GHz) were carried out on different microporous systems (including sintered glass filters, sandstone and carbonate rocks) saturated with brine (electrolytic water solution) and a hydrocarbon oil at different relative fractions. Three main contributions were singled out in the dielectric spectra: low frequency dispersion (LFD) effects (<... View full abstract»

• ### Dielectric response of cyanobiphenyl in the low frequency region

Publication Year: 2001, Page(s):401 - 405
Cited by:  Papers (2)
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Dielectric measurement of liquid crystal materials with the cyanobiphenyl group, in different phases, are described. Measurements were carried out from 10-4 Hz to 104 Hz. In both isotropic and nematic phases a linear increase of ΔC'=C'-C∞ and C" with decreasing frequency is observed at f⩽0.1 Hz. C' and C" represent the complex capacitance, C &i... View full abstract»

• ### Limiting losses in dielectrics

Publication Year: 2001, Page(s):345 - 351
Cited by:  Papers (4)
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Examination of a wide range of experimental data relating to low-loss' dielectric materials reveals the little acknowledged fact that their loss at high frequencies (kHz to GHz) and low temperatures (typically 100 to 200 K) is weakly or very weakly dependent on frequency, what we call flat loss', and is likewise weakly dependent on temperature. Moreover, the absolute value of the loss tangent ta... View full abstract»

• ### The influence of dipolar species on charge carrier transport in a linear polysilicon

Publication Year: 2001, Page(s):432 - 441
Cited by:  Papers (13)
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Effect of polar substituents and polar dopants on the transport of charge carriers in poly[methyl(phenyl)silanediyl] (PMPSI) was studied. The transport in undoped PMPSI can be explained within the theory of disordered polarons which postulates that the temperature and field dependence of the charge carrier mobility contain contributions both from the dynamic disorder, i.e. the polaron barrier, and... View full abstract»

• ### Revised approach to dielectric relaxation of TMACAB crystals near the ferroelectric phase transition

Publication Year: 2001, Page(s):481 - 484
Cited by:  Papers (2)
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This paper presents results on statistical investigations of dielectric relaxation data of the mixed crystal [N(CH3)3 H]3Sb2(1-x)Bi2xCl9 (x=0, 0.07, 0.33) (TMACAB) in the frequency range 107 to 10 9 Hz. The most characteristic property observed at temperatures close to the ferroelectric phase transition is the ... View full abstract»

• ### Dielectric properties of holmium oxide films

Publication Year: 2001, Page(s):447 - 453
Cited by:  Papers (4)
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Results of dielectric studies of electron-beam deposited holmium oxide thin films, examined in metal/insulator/metal (MIM) structures, are reported. The frequency domain characteristics of the capacitance, dielectric loss and complex impedance have been estimated from the time domain measurements of the charging and discharging currents. The influence of the voltage on the dielectric characteristi... View full abstract»

• ### Influence of temperature and pressure on the dynamics of glass formers explored by dielectric spectroscopy

Publication Year: 2001, Page(s):395 - 400
Cited by:  Papers (6)
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The dynamics of the epoxy compound polyphenyl-glycidyl-ether-coformaldehyde was investigated by wideband dielectric spectroscopy (10-2 to 1010 Hz) by varying either pressure or temperature. The measurements were undertaken in two different conditions: under isobaric condition (atmospheric pressure) varying temperature down to the supercooled and glassy phases and under isothe... View full abstract»

• ### Coupling model explanation of salient dynamic properties of glass-forming substances

Publication Year: 2001, Page(s):329 - 344
Cited by:  Papers (32)
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Most of the important and general dynamic properties of structural glass-forming substances have been classified into twelve different categories in a recent review. Within the same property in each category, by examining a large number of glass-formers, a pattern of variation is found which correlates with the departure of the structural relaxation of the glass-former from exponential decay or th... View full abstract»

• ### A molecular dynamics study of lead-bismuth-silicate glasses

Publication Year: 2001, Page(s):385 - 389
Cited by:  Papers (2)  |  Patents (5)
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We present the results of molecular dynamics (MD) simulations of the structure of ternary lead-bismuth-silicate glasses of compositions xPbO(0.3-x)Bi1.50.7SiO2, x=0.06, 0.15, 0.24, and their totally reduced forms, i.e. xPb(0.3-x)Bi0.7SiO2, x=0.06, 0.15, 0.24 systems. The simulations have been performed in the microcanonical (NVE) ensemble, using two-body interactio... View full abstract»

• ### Synthesis, structure and conduction of a novel radical cation salt, (ET)5Dy(NCS)6NO3.C2H5 OH

Publication Year: 2001, Page(s):429 - 431
Cited by:  Papers (2)
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A new radical cation salt (ET)5Dy(NCS)6No 3.C2H5OH based on a complex dysprosium anion was prepared by electrochemical oxidation of bis (ethylenedithio)tetrathiafulvalene (ET) in a chlorobenzene-ethanol solution. Its crystal structure and conducting properties were studied. The salt has a layered crystal structure with a new type of packing of... View full abstract»

• ### Collective and molecular modes in ferroelectric and antiferroelectric liquid crystals

Publication Year: 2001, Page(s):477 - 480
Cited by:  Papers (6)
| | PDF (340 KB) | HTML

A new 4-(1-methylheptyloxycarbonyl)phenyl4'-octyloxybiphenyl-4-carboxylate (MHPOBC) analog exhibiting ferroelectric and antiferroelectric properties has been studied by dielectric and electro-optic methods. Dielectric measurements were performed using a gold coated cell, thickness 23 μm. In the ferroelectric SmC* phase a pronounced Goldstone mode was found, whereas in the antiferroelectric SmC*... View full abstract»

• ### On dielectric data analysis. Using the Monte Carlo method to obtain relaxation time distribution and comparing non-linear spectral function fits

Publication Year: 2001, Page(s):310 - 320
Cited by:  Papers (47)
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In this paper, we present a technique for analyzing dielectric response data in the frequency domain, χ(ω)=ε(ω)-ε∞ =ε'(ω)-ε∞-iε(ω). We use a predistribution of relaxation times and reconstruct the original data by single Debye relaxations using a box constraint, least squares algorithm. The resulting relaxation ... View full abstract»

• ### Can charge cause dielectric hysteresis? Observations on non-ferroelectric α-PVDF

Publication Year: 2001, Page(s):494 - 499
Cited by:  Papers (11)
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Under suitable conditions, hysteresis of the current or of the polarization can be observed as a function of the electric field during poling of ferroelectric polymer films. This behavior has been investigated extensively, and was explained for various ferroelectric polymers with the well-known theory of ferroelectrics. The present work, however, indicates that poling of polymers that contain exce... View full abstract»

• ### The orientational order in nematic liquid crystals from birefringence measurements

Publication Year: 2001, Page(s):512 - 515
Cited by:  Papers (29)
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Various methods of order parameter determination from optical measurements are compared. Measurement results of birefringence and refractive index of liquid-crystalline 4'-pentyloxy-4-cyanobiphenyl (OCB) in the nematic phase are reported. Using these data, the polarizability anisotropy was calculated for both Vuks and Neugebauer local field models. Polarizabilities calculated in this way were appl... View full abstract»

• ### Dielectric relaxation of chiral octylocyanobiphenyl in racemate sample

Publication Year: 2001, Page(s):377 - 380
Cited by:  Papers (1)
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The complex electric permittivity of racemate of chiral octyloxycyanobiphenyl (8*OCB) molecules has been studied in the frequency range 0.1 Hz to 0.1 MHz and over a wide temperature range. On cooling the isotropic liquid phase is easily supercooled and below 30 K transforms into glass. On heating a corresponding glass-liquid transition was observed. The dielectric α-relaxation found in super... View full abstract»

• ### Thermally stimulated currents in cured resin of electrostatic powder coating

Publication Year: 2001, Page(s):531 - 537
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Thermally stimulated currents (TSC) were observed for commercial powder paints partially cured at different temperatures and different times. A higher temperature band between the two TSC bands observed in the cured paints shifted with regularity towards the high temperature side, depending on the cure temperature and time. Activation energies for the cure processes were derived from phenomenologi... View full abstract»

• ### Time-of-flight ion mobility measurements in epoxy-amine systems during curing

Publication Year: 2001, Page(s):572 - 576
Cited by:  Papers (10)
| | PDF (504 KB) | HTML

The technique based on the time-of-flight (TOF) concept was proposed for determination of ion mobility in epoxy resins under isothermal curing conditions. This study extends our earlier investigations on this subject. Ionic conductivity dc measurements also were carried out in order to gain better understanding of the evolution of the ionic conductivity and mobility. The experiments have been perf... View full abstract»

• ### The role of exciton and charge carrier diffusion in photoenhanced currents

Publication Year: 2001, Page(s):422 - 425
Cited by:  Papers (1)  |  Patents (1)
| | PDF (440 KB) | HTML

This work concerns the influence on photoenhanced currents of the diffusion of excitons as well as of charge carriers. It is shown that both kinds of diffusion are important for photoenhanced currents in the case of thin samples. Experimental results obtained on tetracene layers confirm this conclusion View full abstract»

• ### On the applicability of the GOK model for TSC relaxation

Publication Year: 2001, Page(s):469 - 471
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Basic theoretical models for thermally stimulated relaxation phenomena, due to the many parameters involved, are usually too complex to be applied to the analysis of experimental data. For many years, the general order kinetics (GOK) model was used as a `first approach' analysis of thermoluminescence (TL) glow curves. In this paper similar equations are derived for thermally stimulated current (TS... View full abstract»

## Aims & Scope

IEEE Transactions on Dielectrics and Electrical Insulation contains topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.

Full Aims & Scope

Editor-in-Chief
Reuben Hackam