scholarly journals Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba0.97La0.02Ti1−xNb4x/5O3 perovskite ceramics

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23664-23678
Author(s):  
M. Jebli ◽  
Ch. Rayssi ◽  
J. Dhahri ◽  
M. Ben Henda ◽  
Hafedh Belmabrouk ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Frequency Dependence ◽  
Temperature Dependent ◽  
Temperature Dependent Conductivity ◽  
Morphological Studies ◽  
Perovskite Ceramics ◽  
Perovskite Ceramic

The frequency- and temperature-dependent conductivity of our polycrystalline perovskite ceramic systems with a composition of Ba0.97La0.02Ti1−xNb4x/5O3 (x = 5, 7 and 10, in mol%) was investigated.

TEMPERATURE PROGRAMMED OXYGEN EVOLUTION AND ELECTRICAL CONDUCTIVITY OF A NEW SERIES OF FLUORITE COMPOSITIONS IN La2-xPrxO3+y (1≤x≤2) SYSTEM

1999 ◽  
Vol 13 (04) ◽  
pp. 419-426 ◽  
Author(s):  
M. RAJENDRAN ◽  
M. GHANASHYAM KRISHNA ◽  
A. K. BHATTACHARYA
Keyword(s):  
Electrical Conductivity ◽  
Oxygen Evolution ◽  
Room Temperature ◽  
Temperature Dependent ◽  
Temperature Dependent Conductivity ◽  
Peak Intensity ◽  
Temperature Programmed ◽  
Two Temperature ◽  
Flowing Oxygen ◽  
Uptake And Release

Temperature programmed oxygen evolution (TPD) and electrical conductivity of a new series of fluorite compositions in La 2-x Pr x O 3+y(1≤x≤2) system have been investigated. For x=2, oxygen evolution occurs at three distinct steps, whereas for x≤1.8, oxygen evolution occurs only in two steps and for x=1 it becomes negligible. A decrease in the Pr-content in the fluorite compositions lowers the TPD peak intensity. The samples resorb oxygen on annealing at 650° C in flowing oxygen and cooling the samples to room temperature revealing the reversible oxygen uptake and release feature. The electrical conductivity increases as a function of Pr-content in this series. For x≤1.8, the temperature dependent conductivity shows breaks at two temperature regions and the magnitude of the break is pronounced in Pr-rich compositions. Also, the activation energy decreases as the Pr-content is increased in this series. The present results suggest that the fluorite compositions in this system might have potential as catalysts to store/transport/release oxygen reversibly.

1/f Noise in Mott Variable Range Hopping Conduction in p-type Amorphous Silicon

2015 ◽  
Vol 1770 ◽  
pp. 25-30 ◽  
Author(s):  
V.C. Lopes ◽  
A.J. Syllaios ◽  
D. Whitfield ◽  
K. Shrestha ◽  
C.L. Littler
Keyword(s):  
Electrical Conductivity ◽  
Amorphous Silicon ◽  
Chemical Vapor ◽  
Variable Range Hopping ◽  
Temperature Dependent ◽  
Noise Component ◽  
Variable Range ◽  
Noise Measurements ◽  
P Type ◽  
Hydrogenated Amorphous

ABSTRACTWe report on electrical conductivity and noise measurements made on p-type hydrogenated amorphous silicon (a-Si:H) thin films prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD). The temperature dependent electrical conductivity can be described by the Mott Variable Range Hopping mechanism. The noise at temperatures lower than ∼ 400K is dominated by a 1/f component which follows the Hooge model and correlates with the Mott conductivity. At high temperatures there is an appreciable G-R noise component.

Influence of Mn doping on electrical conductivity of lead free BaZrTiO 3 perovskite ceramic

2018 ◽  
Vol 44 (9) ◽  
pp. 10315-10321 ◽  
Author(s):  
Kanta Maan Sangwan ◽  
N. Ahlawat ◽  
Sunita Rani ◽  
Suman Rani ◽  
R.S. Kundu
Keyword(s):  
Electrical Conductivity ◽  
Lead Free ◽  
Mn Doping ◽  
Perovskite Ceramic

Structure, dielectric, and temperature-dependent conductivity studies of the Li2FeSiO4/C nano cathode material for lithium-ion batteries

Ionics ◽  
2018 ◽  
Vol 25 (5) ◽  
pp. 2041-2056 ◽  
Author(s):  
P. Sivaraj ◽  
K. P. Abhilash ◽  
B. Nalini ◽  
P. Balraju ◽  
Sudheer Kumar Yadav ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Temperature Dependent ◽  
Temperature Dependent Conductivity

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.

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