Synthesis and EMW absorbing properties of nano SiC modified PDC–SiOC

Nano SiC modified silicon oxycarbide (n-SiC/SiOC) ceramics had special microstructure and phase composition that can lead to electric dipole polarization and interfacial scattering which eventually resulted in the strong absorption capability of n-SiC/SiOC.

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Влияние дипольной поляризации эмитирующей поверхности на пороги автоэмиссии многоострийных кремниевых катодных матриц

Письма в журнал технической физики ◽

10.21883/pjtf.2018.13.46329.17313 ◽

2018 ◽

Vol 44 (13) ◽

pp. 68

Author(s):

Р.К. Яфаров

Keyword(s):

Phase Composition ◽

Dominant Role ◽

Structural Phase ◽

Emission Characteristics ◽

Wide Range ◽

Fluorocarbon Plasma ◽

Silicon Structures ◽

Surface Modified ◽

Dipole Polarization

AbstractRegularities of changes in the structural-phase composition and morphological and field-emission characteristics of surface-structured silicon wafers with various types of conductivity have been studied. It is shown that the use of a fluorocarbon plasma in the process of structuring, along with a carbon mask coating, allows obtaining preset autoemission currents of silicon cathode matrices when the external electric-field strength varies in a wide range irrespectively of the change of the gain factors of the fields of the emitting protrusions. The dominant role of dipole polarization in autoemission of electrons in surface-modified silicon structures has been established.

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INDUCED POLARIZATION IN ELECTROLYTE SATURATED EARTH PLUGS

Geophysics ◽

10.1190/1.1438861 ◽

1961 ◽

Vol 26 (2) ◽

pp. 205-210 ◽

Cited By ~ 4

Author(s):

J. H. Henkel ◽

T. C. Collins

Keyword(s):

Time Dependence ◽

Electric Dipole ◽

Concentration Polarization ◽

Solution Concentration ◽

Induced Polarization ◽

Relaxation Theory ◽

Clay Particles ◽

Formation Resistivity ◽

Current Flows ◽

Dipole Polarization

This paper describes the results of some studies of the dependence of induced polarization and of the formation resistivity factor upon solution concentration in saturated porous plugs. Two theories based upon two different simple models are developed. The first treats induced polarization as an electric dipole polarization occurring at the surface of clay particles. It is a relaxation theory that does not lead to results agreeable with experiments. The second theory treats induced polarization as a concentration polarization which is induced at solution‐clay surfaces when current flows across the surfaces. The second theory is more successful than the first in two ways: (1) it leads to a time dependence more consistent with the experimental decays; (2) it leads to equations involving the resistivity of the saturating solution [Formula: see text] which are also more consistent with experiments.

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