Temperature-dependent resistivity of a flat conductor and the temperature, current, and electric field patterns

1975 ◽  
Vol 29 (3) ◽  
pp. 1194-1195 ◽  
Author(s):  
R. S. Kuznetskii
Keyword(s):  
Electric Field ◽  
Temperature Dependent ◽  
Field Patterns ◽  
Temperature Dependent Resistivity

Simulation of Temperature-Dependent Resistivity for Manganite La 1/3 Ca 2/3 MnO 3

2006 ◽  
Vol 23 (6) ◽  
pp. 1551-1553 ◽  
Author(s):  
Cao Shuo ◽  
Zhou Qing-Li ◽  
Guan Dong-Yi ◽  
Lu Hui-Bin ◽  
Yang Guo-Zhen
Keyword(s):  
Temperature Dependent ◽  
Temperature Dependent Resistivity

SYNTHESIS, STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF IN-SITU SYNTHESIZED POLYANILINE/SILVER NANOCOMPOSITES

2012 ◽  
Vol 05 (03) ◽  
pp. 1250026 ◽  
Author(s):  
FAHAD ALAM ◽  
SAJID ALI ANSARI ◽  
WASI KHAN ◽  
M. EHTISHAM KHAN ◽  
A. H. NAQVI
Keyword(s):  
Single Phase ◽  
In Situ Polymerization ◽  
Optical And Electrical Properties ◽  
Silver Colloid ◽  
Dielectric Measurements ◽  
Temperature Dependent ◽  
Colloidal Form ◽  
Uv Visible ◽  
Temperature Dependent Resistivity

Polyaniline (PANI) is recognized as one of the most important conducting polymers due to its high conductivity and good stability. In this paper, polyaniline/silver (PANI/Ag) nanocomposites were synthesized by in-situ polymerization of aniline using ammonium peroxydisulphate (APS) as oxidizing agent with varying concentration of Ag nanoparticles colloids (0 ml, 25 ml and 50 ml). Silver nanoparticles were synthesized separately in colloidal form from silver nitrate (Ag2NO3) with the help of reducing agent sodium borohydride (NaBH4). The PANI/ Ag nanocomposites were characterized by XRD, SEM, AFM, UV-visible, temperature dependent resistivity and dielectric measurements. All samples show a single phase nature of the nanoparticles. The electrical resistivity as function of temperature was measured in the temperature range 298–383 K, which indicates a semiconducting to metallic transition at 373 K and 368 K for 25 ml and 50 ml silver colloid samples, respectively.

scholarly journals Effects of Frequency and Temperature on Electric Field Mitigation Method via Protruding Substrate Combined with Applying Nonlinear FDC Layer in Wide Bandgap Power Modules

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2022 ◽  
Author(s):  
Maryam Mesgarpour Tousi ◽  
Mona Ghassemi
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
Metal Layer ◽  
Wide Bandgap ◽  
High Density ◽  
Field Calculation ◽  
Power Module ◽  
Temperature Dependent ◽  
Ac Electrical Conductivity ◽  
Power Modules

Our previous studies showed that geometrical techniques including (1) metal layer offset, (2) stacked substrate design and (3) protruding substrate, either individually or combined, cannot solve high electric field issues in high voltage high-density wide bandgap (WBG) power modules. Then, for the first time, we showed that a combination of the aforementioned geometrical methods and the application of a nonlinear field-dependent conductivity (FDC) layer could address the issue. Simulations were done under a 50 Hz sinusoidal AC voltage per IEC 61287-1. However, in practice, the insulation materials of the envisaged WBG power modules will be under square wave voltage pulses with a frequency of up to a few tens of kHz and temperatures up to a few hundred degrees. The relative permittivity and electrical conductivity of aluminum nitride (AlN) ceramic, silicone gel, and nonlinear FDC materials that were assumed to be constant in our previous studies, may be frequency- and temperature-dependent, and their dependency should be considered in the model. This is the case for other papers dealing with electric field calculation within power electronics modules, where the permittivity and AC electrical conductivity of the encapsulant and ceramic substrate materials are assumed at room temperature and for a 50 or 60 Hz AC sinusoidal voltage. Thus, the big question that remains unanswered is whether or not electric field simulations are valid for high temperature and high-frequency conditions. In this paper, this technical gap is addressed where a frequency- and temperature-dependent finite element method (FEM) model of the insulation system envisaged for a 6.5 kV high-density WBG power module will be developed in COMSOL Multiphysics, where a protruding substrate combined with the application of a nonlinear FDC layer is considered to address the high field issue. By using this model, the influence of frequency and temperature on the effectiveness of the proposed electric field reduction method is studied.

Electrical Resistivity and Magnetoresistance of the δ-FeZn10 Complex Intermetallic Phase

2013 ◽  
Vol 1517 ◽  
Author(s):  
P. Koželj ◽  
S. Jazbec ◽  
J. Dolinšek
Keyword(s):  
Electrical Resistivity ◽  
Intermetallic Phase ◽  
Structural Complexity ◽  
Weak Localization ◽  
Intrinsic Disorder ◽  
Atomic Clusters ◽  
Charge Carriers ◽  
Temperature Dependent ◽  
Temperature Dependent Resistivity ◽  
Complex Metallic Alloys

ABSTRACTThe δ-FeZn10 phase possesses high structural complexity typical of complex metallic alloys: a giant unit cell comprising 556 atoms, polyhedral atomic order with icosahedrally-coordinated environments, fractionally occupied lattice sites and statistically disordered atomic clusters that introduce intrinsic disorder into the structure. The electrical resistivity is large and exhibits a maximum at about 220 K. The magnetoresistance is sizeable, amounting to 1.5 % at 2 K in 9 T field. The temperature–dependent resistivity is discussed within the frame of the theory of slow charge carriers, applicable to metallic systems with weak dispersion of the electronic bands, where the electron motion changes from ballistic to diffusive upon heating. A comparison to the theory of weak localization is also made.

Temperature dependent domain-wall moving dynamics of lithium niobate during high electric field periodic poling

2020 ◽  
Vol 128 (22) ◽  
pp. 224101
Author(s):  
Qilu Liu ◽  
Fulei Wang ◽  
Dongzhou Wang ◽  
Dehui Sun ◽  
Yuanhua Sang ◽  
...  
Keyword(s):  
Domain Wall ◽  
Lithium Niobate ◽  
Electric Field ◽  
High Electric Field ◽  
Temperature Dependent ◽  
Dependent Domain
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