Influence of Electric Field and Temperature on Magnetic Field Induced Prolonged Changes of Electric Parameters of Silicon Systems

1995 ◽  
Vol 378 ◽  
Author(s):  
Vladimir M Maslovsky
Keyword(s):  
Magnetic Field ◽  
Diffusion Coefficient ◽  
Electric Field ◽  
Diffusion Activation Energy ◽  
Influence Of Temperature On ◽  
Electric Parameters ◽  
Generation Lifetime ◽  
Equilibrium Defects ◽  
First Time ◽  
Diffusion Activation

AbstractMagnetic field induced prolonged changes (MFIPC) of electric parameters of semiconductor systems is the phenomenon that has been recently established experimentally. In this work it is investigated for the first time the influence of electric field and temperature on duration of MFIPC of carrier generation lifetime in Si subsurface region and the influence of temperature on MFIPC of the MOS structure leakage voltage. The value of determined mobility of generated defects corresponds to the diffusion coefficient of vacancy -impurity complexes. These investigations of MFIPC of microstructure confirm that non-equilibrium defects reactions are limited by diffusion (in the absence of external electric field). It is shown that the corresponding diffusion coefficient is about 10−13 cm2s−1 and the magnitude of diffusion activation energy determined from these investigations is in the range 0.45–0.5 eV. This value is nearly the same as the diffusion coefficient of vacancy-impurity complex.

Diffusion Behavior of Carbon Atoms in Austenite Region of SCM435 Steel

2016 ◽  
Vol 850 ◽  
pp. 266-270 ◽  
Author(s):  
Dong Xu ◽  
Bing Zheng ◽  
Xing Liang Gao ◽  
Miao Yong Zhu
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Arrhenius Equation ◽  
Diffusion Constant ◽  
Carbon Diffusion ◽  
Diffusion Activation Energy ◽  
Diffusion Behavior ◽  
Scm435 Steel ◽  
The Relationship ◽  
Diffusion Activation

The research on the decarbonizing behavior of the austenite region of SCM435 steel was carried out. And the experimental results shewed that the relationship between the diffusion coefficient and temperature totally agreed with the Arrhenius equation and that the diffusion constant and the diffusion activation energy were uniform within the temperature range of 900-1100°C. However, when the austenite reached certain temperature, the carbon diffusion coefficient decreased significantly as temperature increased and its relationship with temperature no longer agreed with the Arrhenius equation.

scholarly journals Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46643-46653 ◽  
Author(s):  
Johnny Nguyen ◽  
Sonia Contera ◽  
Isabel Llorente García
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Static Magnetic Field ◽  
Time Varying ◽  
Micro Particles ◽  
First Time

We demonstrate, for the first time, confinement of the orientation of graphitic micro-flakes to a well-defined plane in solution by applying two perpendicular fields: a vertical static magnetic field and a horizontal time-varying electric field.

Atomic Diffusion of Al and Si in Cu44.25Ag14.75Zr36Ti5 Bulk Metallic Glass

2012 ◽  
Vol 510 ◽  
pp. 804-807
Author(s):  
Wei Yuan Yu ◽  
You Liang Wang ◽  
Wen Jiang Lu
Keyword(s):  
Diffusion Coefficient ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Diffusion Mechanism ◽  
Base Material ◽  
Atomic Diffusion ◽  
Diffusion Activation Energy ◽  
Metal Atoms ◽  
Secondary Ion ◽  
Diffusion Activation

Secondary ion mass spectroscopy (SIMS) has been adopted to study the diffusion of Al and Si in Cu44.25Ag14.75Zr36Ti5bulk metallic glass (BMG). It has been found that around the transition temperature of metallic glass, the relation between its diffusion coefficient and the temperature satisfy the same Arrhenius relation, which means the metallic transition has not caused change to the diffusion mechanism. In addition, the radius of Al atom is close to that of Si atom, but under the same temperature and time condition, the diffusion coefficient of Si atom in bulk metallic glass (BMG) is twice that of the Al atom, while there is not a big difference in diffusion activation energy. This is because as non-metallic element, the radius of Si atom has a strong binding force with the metal atoms in the base material, which also has a bigger diffusion coefficient.

DIFFUSION OF NH2NO2 ON Al (111) SURFACE: MOLECULAR DYNAMICS STUDY

2016 ◽  
Vol 23 (06) ◽  
pp. 1650048 ◽  
Author(s):  
SUQIN ZHOU ◽  
DENGHAO LI ◽  
WEI ZHOU ◽  
XUEHAI JU ◽  
DINGYUN JIANG
Keyword(s):  
Molecular Dynamics ◽  
Binding Energies ◽  
Original Position ◽  
Diffusion Activation Energy ◽  
Influence Of Temperature ◽  
Bonding Interaction ◽  
Influence Of Temperature On ◽  
Diffusion Rates ◽  
Temperature And Pressure ◽  
Diffusion Activation

The diffusion of NH2NO2 molecules on the Al (111) surface has been investigated by the molecular dynamics (MD) method. The influence of temperature and pressure on their diffusion was studied. The binding energies decrease obviously with the temperature increasing because non-bonding interaction between Al atoms and NH2NO2 molecules weakens. As the temperature increases, the value of the first peak for radial distribution function (RDF) of Al–N and Al–O bond decreases. Diffusion rates increase with temperature increasing whereas they first decrease, then increase with pressure increasing below 450[Formula: see text]K. The diffusion activation energy of NH2NO2 molecules on the Al surface is among 13.8–18.1[Formula: see text]kJ[Formula: see text][Formula: see text][Formula: see text]mol[Formula: see text] at the pressure from 0[Formula: see text]GPa to 10.0[Formula: see text]GPa, which indicates that NH2NO2 molecules diffuse easily on the Al surface and the influence of pressure on diffusion of NH2NO2 molecules on the Al surface is small. At the low temperature (i.e. below 300[Formula: see text]K), the NH2NO2 molecules are mainly adsorbed on the Al surface by intramolecular and intermolecular interactions, while NH2NO2 molecules diffuse on the Al surface and surface Al atoms deviate a little from their original position above the moderate temperature (i.e. above 350[Formula: see text]K). These results indicate that the influence of temperature on the diffusion of NH2NO2 molecules on the Al surface is large whereas the influence of pressure on the diffusion is relatively small.

scholarly journals Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field

2004 ◽  
Vol 22 (12) ◽  
pp. 4243-4258 ◽  
Author(s):  
G. Chisham ◽  
M. P. Freeman ◽  
I. J. Coleman ◽  
M. Pinnock ◽  
M. R. Hairston ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Interplanetary Magnetic Field ◽  
Line Length ◽  
Hf Radar ◽  
Plasma Convection ◽  
Ionosphere Plasma ◽  
Reconnection Region ◽  
Field Lines ◽  
First Time

Abstract. This study presents, for the first time, detailed spatiotemporal measurements of the reconnection electric field in the Northern Hemisphere ionosphere during an extended interval of northward interplanetary magnetic field. Global convection mapping using the SuperDARN HF radar network provides global estimates of the convection electric field in the northern polar ionosphere. These are combined with measurements of the ionospheric footprint of the reconnection X-line to determine the spatiotemporal variation of the reconnection electric field along the whole X-line. The shape of the spatial variation is stable throughout the interval, although its magnitude does change with time. Consequently, the total reconnection potential along the X-line is temporally variable but its typical magnitude is consistent with the cross-polar cap potential measured by low-altitude satellite overpasses. The reconnection measurements are mapped out from the ionosphere along Tsyganenko model magnetic field lines to determine the most likely reconnection location on the lobe magnetopause. The X-line length on the lobe magnetopause is estimated to be ~6–11 RE in extent, depending on the assumptions made when determining the length of the ionospheric X-line. The reconnection electric field on the lobe magnetopause is estimated to be ~0.2mV/m in the peak reconnection region. Key words. Space plasma physics (Magnetic reconnection) – Magnetospheric physics (Magnetopause, cusp and boundary layers) – Ionosphere (Plasma convection)

Vectorial Impedance Identity for the Natural Dependence of Harmonic Fields on Closed Boundaries

1975 ◽  
Vol 53 (15) ◽  
pp. 1404-1407 ◽  
Author(s):  
O. A. Aboul-Atta ◽  
W. M. Boerner
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Inverse Scattering ◽  
Field Solution ◽  
Tangential Electric Field ◽  
First Time ◽  
Scalar Equations ◽  
Harmonic Electromagnetic Field ◽  
Exact Description

The exact description of the harmonic electromagnetic field solution at scattering surfaces is shown to require, in general, two impedances to relate the tangential electric field to the tangential magnetic field. The consequences lead to the generation of two independent surface vectors that are orthogonal, of equal norm, and have a realizable direction. They are used to describe the surface by two scalar equations. For the first time, the details of this vectorial impedance identity, the derivation of those two vectors, and the two scalar inverse scattering surface equations are shown.

scholarly journals Electrorheological Behavior of Suspensions of Polyimide-Based on the Sodium Salt of 2,5-Diaminobenzenesulfonic Acid

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1015 ◽  
Author(s):  
Nikolay Semenov ◽  
Alexander Danilin ◽  
Yulia Karnet ◽  
Elena Kelbysheva
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Power Lines ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Electrorheological Suspensions ◽  
First Time ◽  
Electrorheological Properties

Electrorheological suspensions (ERS) of polyimide particles with organoelement fragments from the sodium salt of 2,5-diaminobenzene sulfonic acid were obtained for the first time. Their rheological and electrorheological characteristics, their dependence on the parameters of deformation, and the intensity of the external electric field were studied. It was found that the ERS of PI-Na polyimide particles have a significant electrorheological response. Solid-polyimide materials were previously studied using a scanning electron microscope. The effect of the polyimide concentration on the properties of the solution was studied by spectrophotometry. It was shown that polyimide suspension is a result of increasing intensity as the electric field changes the flow type from Newtonian to pseudoplastic due to polarization of the particles and formation of the chain structures along the power lines of the electric field. The influence of temperature on the change of rheological and electrorheological properties of a polyimide ERS in constant electric fields was investigated.

Size-Dependent Diffusion Coefficient in Nanocrystalline Materials

2011 ◽  
Vol 391-392 ◽  
pp. 418-421 ◽  
Author(s):  
S. Zhang
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Simple Model ◽  
Model Prediction ◽  
Nanocrystalline Materials ◽  
Free Parameter ◽  
Room Temperature ◽  
Diffusion Activation Energy ◽  
Size Dependent ◽  
Diffusion Activation

A simple model, without any free parameter, is introduced to predict the size-dependent diffusion coefficient of nanocrystalline materials in this contribution. It is found that as the size of the nanocrystals decreases, the diffusion activation energy of atoms decreases and the corresponding diffusion coefficient strongly increases due to the Arrhenius relationship between them, which leads to evident diffusion at the room temperature. The model prediction is in agreement with the experimental diffusion results of Cu and Ag diffusion in Cu nanocrystalline materials.

On the Physics of the Anomalous Characteristics of Fickian Diffusion of Fe and Other Transition-Element Impurities in Crystalline Al at Elevated Temperatures

2006 ◽  
Vol 251-252 ◽  
pp. 111-122 ◽  
Author(s):  
Yuriy S. Nechaev
Keyword(s):  
Diffusion Coefficient ◽  
Elevated Temperatures ◽  
Transition Element ◽  
Frequency Factor ◽  
The Self ◽  
Fickian Diffusion ◽  
Diffusion Activation Energy ◽  
Self Diffusion ◽  
Diffusion Activation ◽  
Self Diffusion Coefficient

As the critical constructive analysis, with using the thermodynamic and crystal-chemical approaches, of the related experimental data is shown, the anomalous (with respect to the Al selfdiffusion characteristics (DAl - the self-diffusion coefficient, D0Al - the entropy (frequency) factor of the self-diffusion coefficient, QAl – the self-diffusion activation energy (enthalpy)) quantities of D*, D0*, Q* of the transition impurity Fickian diffusion in Al in many cases can be of the apparent character (related to the known Oriani model), whereas the normal quantities of D, D0, Q (i.e., close to DAl, D0Al, QAl), and the anomalously low quantities of D⊥, Q⊥, D0⊥ can be as the true characteristics of the impurity Fickian diffusion in the normal Al lattice (bulk) and in the compound-like nanosegregation (CLNS) structures at dislocations, respectively.

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