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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»

• ### 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»

• ### 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»

• ### 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»

• ### 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»

• ### 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»

• ### 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»

• ### Collective dynamic modes of microconfined ferroelectric liquid crystals

Publication Year: 2001, Page(s):488 - 493
Cited by:  Papers (9)
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The dielectric properties of the ferroelectric liquid crystal 4-oetyloxy-4-(2-methylbutyloxy)carbonyl-phenylbenzoate in different confinements have been investigated. While the molecular dynamic processes are not influenced by the micro-porous confinement, the collective relaxation processes are strongly affected by restricted geometry. Changes of shape, dispersion and frequency of the relaxation ... View full abstract»

• ### Dielectric spectroscopy of chemically stabilized pericardium tissue at sub-zero temperatures

Publication Year: 2001, Page(s):527 - 530
Cited by:  Papers (2)
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In this paper dielectric spectroscopy is used as a tool for the investigation of crosslinking processes in chemically modified collageneous tissues. Measurements in the frequency range of 10-1 to 107 Hz and at temperatures 180, 200 and 220 K have been performed for collageneous porcine pericardium tissues, crosslinked with glutaraldehyde (GA) and dimethyl suberimidate (DMS) ... View full abstract»

• ### 4-t-butyl-CuPc-PODT molecular composite material for an effective gas sensor

Publication Year: 2001, Page(s):559 - 565
Cited by:  Papers (8)
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The sensing properties of molecular composites, tetratertbutyl copper phthalocyanine (TBCPC) and polyoctadecyl thiophene (PODT), were investigated by optical and conductance measurements. A standard substrate for gas sensing was made, consisting of a set of eight interdigitated gold electrodes, 230 μm wide and spaced, and 0.10 μm thick, photo-lithographically fixed on an SiO2 coat... 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»

• ### Complex dynamics of hydrogen bonded self-assembling polymers

Publication Year: 2001, Page(s):365 - 372
Cited by:  Papers (16)  |  Patents (2)
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Supramolecular polymers, which are non-covalently bonded and formed by self association of di or trifunctional monomers exhibit, by virtue of quadruple hydrogen bonds, many of the properties of normal high molecular weight polymers, e.g. a dynamic rubber plateau. We focus on the molecular and cooperative dynamics of self-assembled linear polymers and networks, studied by broadband dielectric relax... 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»

• ### 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»

• ### Modeling the dielectric response in relaxor ferroelectrics

Publication Year: 2001, Page(s):472 - 476
Cited by:  Papers (2)
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A two-state thermodynamic model of ferroelectric materials exhibiting relaxor properties is proposed. One state represents ferroelectric properties with a ferroelectric-paraelectric transition. The second one is relaxor-like, with vanishing macroscopic polarization and diffusive onset of local cluster polarization. The model is able to reproduce qualitatively the dielectric susceptibility both for... View full abstract»

• ### Dielectric relaxation in photochromically doped polymeric matrices studied by optical waveguide technique

Publication Year: 2001, Page(s):507 - 511
Cited by:  Papers (2)
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Optical waveguide methods and, comparatively, optical absorption measurements are used to study dielectric relaxation of polystyrene (PS) thin films doped with spiropyran (SP) at optical frequencies. The time variation in the position and intensity of guided modes is connected with changes in the real and imaginary part of the dielectric function of the film at different wavelengths of the inciden... View full abstract»

• ### Determination of the order parameter of 4-(trans-4'-n-heptyl-cyclohexyl)isothiocyanato-benzene by means of dielectric relaxation spectroscopy

Publication Year: 2001, Page(s):381 - 384
Cited by:  Papers (1)
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Studies of the dielectric relaxation were made for the isotropic and nematic phases of 4-(trans-4'-n-heptylcyclohexyl)isothiocyanatobenzene, (C7H 15-CyHx-Ph-N=C=S) (7CHBT) in the frequency range from 100 kHz to 1 GHz. In the nematic phase two relaxation processes were recorded for the dielectric permittivity component measured parallel to the molecular o... View full abstract»

• ### Nonlinear dielectric relaxation in solutions of hydrogen bonded liquid crystalline carboxylic acid

Publication Year: 2001, Page(s):485 - 487
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This paper presents the results of the nonlinear dielectric studies performed on solutions of 4-butyl-1-cyclohexanecarboxylic acid in cyclohexane at 25°C. Two molecules of the acid, linked by two hydrogen bonds O-H...O, form a cyclic dimer of a rigid and linear structure. The increase of the number of dimers per unit volume finally leads to the nematic liquid crystalline phase. The isotropic t... View full abstract»

• ### Polymorphism of righthanded octyloxycyanobiphenyl

Publication Year: 2001, Page(s):522 - 526
Cited by:  Papers (9)
| | PDF (632 KB) | HTML

Polymorphism of the octyloxycyanobiphenyl isomer 4-(1(S)-methylheptyloxy)-4'cyanobiphenyl (8OCB) was studied by means of adiabatic calorimetry, infrared spectroscopy and polarizing microscopy. Two crystalline phases, C1 and C2, were identified and their thermodynamic parameters measured. A monotropic system of the metastable C1 and stable C2 crystals was obtained. Far infrared absorption and polar... View full abstract»

• ### Thermal aging phenomena in chitosan-related pharmaceutical systems

Publication Year: 2001, Page(s):555 - 558
Cited by:  Papers (1)
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Results are presented of detection of thermal aging in the chitosan/ketoprofen acid (KTA) system, using low-frequency dielectric spectroscopy. Aging leads to substantial changes of the low frequency dielectric properties of the system. In order to identify the reasons for the detected aging, near infra-red (NIR) Raman spectra and distribution of molecular weights as well as direct measurements of ... View full abstract»

• ### Relaxation of excitons and charge carriers in polymers

Publication Year: 2001, Page(s):321 - 328
Cited by:  Papers (3)
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In this paper various aspects of relaxation of optically generated excitations in random organic solids are discussed. Examples are spectral diffusion of excitons in organic glasses, or conjugated polymers, involving energy transfer within an inhomogeneously broadened dense manifold of chromophores, and charge carrier transport in random photoconductors. After an outline of the concept of time dep... 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»

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

Publication Year: 2001, Page(s):422 - 425
Cited by:  Papers (1)  |  Patents (1)
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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»

• ### Real-time crystallization and melting of poly(n-octadecyl methacrylate) induced by temperature and pressure. A dielectric spectroscopy investigation

Publication Year: 2001, Page(s):359 - 364
Cited by:  Papers (15)
| | PDF (760 KB) | HTML

We have studied the crystallization and melting of poly(n-octadecyl methacrylate) (PNODMA) by performing temperature and pressure jump experiments from the melt to the final semicrystalline state. The evolution of the crystallization process is studied in real time by recording the changes in the dielectric spectrum. The single α process in the melt upon crystallization looses intensity and ... View full abstract»

• ### Dielectric and thermal properties of irradiated polyetheretherketone

Publication Year: 2001, Page(s):538 - 542
Cited by:  Papers (5)
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The dielectric and thermal properties of electron-beam-irradiated polyetheretherketone (PEEK) have been investigated and the properties of a heat-treated specimen studied. Results of the temperature dependence of εr' and εr" indicated that ε r' and εr" were higher after electron beam irradiation and lower after heat treatment. The tem... 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