Dielectric properties and specific conductivity of armenian natural clinoptilolite irradiated by electrons

Open Physics ◽  
2005 ◽  
Vol 3 (4) ◽  
Author(s):  
Hrant Yeritsyan ◽  
Aram Sahakyan ◽  
Sergey Nikoghosyan ◽  
Vachagan Harutiunian ◽  
Volodia Gevorkyan ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Electron Irradiation ◽  
Specific Conductivity ◽  
Structural Defects ◽  
Conductivity Measurements ◽  
Specific Electric Conductivity ◽  
Order Of Magnitude ◽  
Natural Clinoptilolite ◽  
Temperature Heating ◽  
High Temperature Heating

AbstractThe results of dielectric properties and direct current specific electric conductivity measurements in Armenian natural clinoptilolite samples are presented. Electron irradiation with energy 8 MeV and thermal treatment of samples are performed to elucidate possible enhancement mechanisms of clinoptilolite parameters. The results are discussed on the basis of new point structural defects formation and recombination of initial ones in samples. It was shown that the irradiation dose of 3·1016 el/cm2 is critical for natural zeolite structural change, which is manifested by significant changes in dielectric properties and other characteristics. The samples subjected to high temperature heating after electron irradiation, in comparison with an unquenched one, have a significantly higher (about an order of magnitude) value of specific conductivity.

Modeling the High-Temperature Heating of Scrap Metals

Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 58-63
Author(s):  
Konstantin V. Strogonov ◽  
◽  
Andrey A. Chaymelov ◽  
Keyword(s):  
High Temperature ◽  
Scrap Metals ◽  
Temperature Heating ◽  
High Temperature Heating

Structure and Conductivity of Iodine-Doped C60 Thin Films

1994 ◽  
Vol 359 ◽  
Author(s):  
Jun Chen ◽  
Haiyan Zhang ◽  
Baoqiong Chen ◽  
Shaoqi Peng ◽  
Ning Ke ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Room Temperature ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
X Ray ◽  
Thermally Activated ◽  
Order Of Magnitude

ABSTRACTWe report here the results of our study on the properties of iodine-doped C60 thin films by IR and optical absorption, X-ray diffraction, and electrical conductivity measurements. The results show that there is no apparent structural change in the iodine-doped samples at room temperature in comparison with that of the undoped films. However, in the electrical conductivity measurements, an increase of more that one order of magnitude in the room temperature conductivity has been observed in the iodine-doped samples. In addition, while the conductivity of the undoped films shows thermally activated temperature dependence, the conductivity of the iodine-doped films was found to be constant over a fairly wide temperature range (from 20°C to 70°C) exhibiting a metallic feature.

Can microorganisms survive high-temperature heating during the interplanetary transfer by meteorites?

BIOPHYSICS ◽  
2007 ◽  
Vol 52 (6) ◽  
pp. 640-644 ◽  
Author(s):  
A. K. Pavlov ◽  
V. N. Shelegedin ◽  
V. T. Kogan ◽  
A. A. Pavlov ◽  
M. A. Vdovina ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Heating ◽  
High Temperature Heating

Phase composition of steel 0Kh21N6B after high-temperature heating and tempering

1969 ◽  
Vol 11 (4) ◽  
pp. 331-332
Author(s):  
�. G. Fel'dgandler ◽  
E. N. Kareva ◽  
E. F. Yakovleva
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Temperature Heating ◽  
High Temperature Heating

scholarly journals Modification of structural and dielectric properties of polycrystalline Gd-doped BFO–PZO

2018 ◽  
Vol 08 (05) ◽  
pp. 1850031 ◽  
Author(s):  
Ambika Ray ◽  
Banarji Behera ◽  
Tanmoy Basu ◽  
Saumitra Vajandar ◽  
Santosh Kumar Satpathy ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Boundary Effect ◽  
Ion Beam ◽  
Ferroelectric Properties ◽  
Compositional Analysis ◽  
Structural Defects ◽  
X Ray ◽  
Dielectric Constant And Loss ◽  
Before And After ◽  
Lcr Meter

[Formula: see text](BiFe[Formula: see text]GdxO3)–y(PbZrO3) composites [Formula: see text], having four different Gd concentrations ([Formula: see text], 0.1, 0.15, and 0.2), were synthesized and their structural, dielectric, and ferroelectric properties have been studied using different characterization techniques. In addition, to investigate the effect of ion implantation on the microstructure and dielectric properties, these composites were exposed to 2[Formula: see text]MeV He[Formula: see text]-ions. Modifications of the structure, surface morphology and electrical properties of the samples before and after ion exposure were demonstrated using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) technique, and LCR meter. The compositional analysis was carried out using energy dispersive X-ray spectrometry (EDS). XRD results demonstrated a decrease in the intensity profile of the dominant peak by a factor of 6 showing a degradation of the crystallinity. Willliamson–Hall (WH) plots reveal reduction in the grain size after irradiation along with an increase in strain and dislocation density. A decrease in the dielectric constant and loss has been recorded after ion beam exposure with reduction in ac conductivity value. The contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist plots. All the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon irradiation. The role of structural defects modifying the physical properties of the composite materials is discussed in this work.

scholarly journals Obtaining and Main Dielectric Properties of Ba0.6Pb0.4TiO3/graphene Oxide Composite

2020 ◽  
Author(s):  
Ryszard Skulski ◽  
Dariusz Bochenek ◽  
Dagmara Brzezińska ◽  
Leszek Stobinski ◽  
Przemysław Niemiec ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Dielectric Properties ◽  
Hysteresis Loops ◽  
Conductivity Measurements ◽  
Oxide Composite ◽  
Plasma Sintering ◽  
Ptcr Effect ◽  
Spark Plasma ◽  
Diffraction Patterns

Abstract In this paper there is described the technology of obtaining and results of investigations of microstructure, XRD, SEM, main dielectric properties, electrical conductivity measurements and P-E hysteresis loops of Ba0.6Pb0.4TiO3/graphene oxide composite (abbr. BPT/GO). In the final step of technology, the samples have been sintered using the Spark Plasma Sintering (SPS) method. Diffraction patterns of BPT/GO composite exhibit lines which can be related with perovskite structure, as well as reveal additional lines that can be derived from the initial component oxides. Investigations of electrical conductivity suggest that the PTCR effect occurs at temperatures up to about 120°C. Dielectric hysteresis loops below 90°C are wide and typical for materials with rather high electrical conductivity. The hysteresis loop obtained at 120°C is more typical for ferroelectrics. The obtained material is interesting, however it is probably possible to find better conditions of obtaining it and/or a better composition.

scholarly journals A.C conductivity and dielectric properties of (PVA/ PEO) blends doped with MWCNTs

2019 ◽  
Vol 14 (30) ◽  
pp. 64-72
Author(s):  
Ahmad A. Hasan
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
The Other ◽  
Poly Vinyl Alcohol ◽  
Conductivity Measurements ◽  
Frequency Range ◽  
Maximum Value ◽  
Multi Walled Carbon Nanotube ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

A.C electrical conductivity and dielectric properties for poly(vinyl alcohol) (PVA) /poly (ethylene oxide) (PEO) blends undopedand doped with multi-walled carbon nanotube (MWCNTs) withdifferent concentrations (1, and 3 wt %) in the frequency range(25x103 - 5x106 Hz) were investigated. Samples of (PVA/PEO)blends undoped and doped with MWCNTs were prepared usingcasting technique. The electrical conductivity measurements showedthat σA.C is frequency dependent and obey the relation σA.C =Aωs forundoped and doped blends with 1% MWCNTs, while it is frequencyindependent with increases of MWCNTs content to 3%. Theexponent s showed proceeding increase with the increase of PEOratio (≥50%) for undoped blends samples, while s value for dopedblends exhibits to change in different manner, i.e. s increases andreach maximum value at 50/50 PVA/PEO, then decreases forresidual doped blends samples with 1% MWCNTs on the other handthe exponent s decrease and reach minimum value at 50/50PVA/PEO for samples doped with 3% MWCNTs, then return toincrease. The results explained in different terms.

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