High Dopant Activation and Diffusion Suppression of Phosphorus in Ge Crystal with High-Temperature Implantation By Two-Step Microwave Annealing

2016 ◽  
Vol 72 (4) ◽  
pp. 219-225 ◽  
Author(s):  
T.-L. Shih ◽  
W.-H. Lee
Keyword(s):  
High Temperature ◽  
Dopant Activation ◽  
Microwave Annealing ◽  
And Diffusion

High-temperature oxidation and diffusion behaviours of YG6X and Inconel625

2019 ◽  
Vol 546 (1) ◽  
pp. 137-147
Author(s):  
Erliang Liu ◽  
Xudong Wei ◽  
Mingming Wang ◽  
Tengda Wang
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
And Diffusion

Effect of interface reaction and diffusion on stress-oxidation coupling at high temperature

2018 ◽  
Vol 123 (15) ◽  
pp. 155301 ◽  
Author(s):  
Mengkun Yue ◽  
Xuelin Dong ◽  
Xufei Fang ◽  
Xue Feng
Keyword(s):  
High Temperature ◽  
Interface Reaction ◽  
And Diffusion ◽  
Reaction And Diffusion ◽  
Oxidation Coupling

scholarly journals Leakage Current Degradation Due to Ion Drift and Diffusion in Tantalum and Niobium Oxide Capacitors

2017 ◽  
Vol 24 (2) ◽  
pp. 255-264 ◽  
Author(s):  
Martin Kuparowitz ◽  
Vlasta Sedlakova ◽  
Lubomir Grmela
Keyword(s):  
High Temperature ◽  
Electric Field ◽  
Leakage Current ◽  
Niobium Oxide ◽  
Ion Concentration ◽  
Homogeneous Distribution ◽  
Insulating Layer ◽  
Ion Drift ◽  
Positive Ions ◽  
And Diffusion

AbstractHigh temperature and high electric field applications in tantalum and niobium capacitors are limited by the mechanism of ion migration and field crystallization in a tantalum or niobium pentoxide insulating layer. The study of leakage current (DCL) variation in time as a result of increasing temperature and electric field might provide information about the physical mechanism of degradation. The experiments were performed on tantalum and niobium oxide capacitors at temperatures of about 125°C and applied voltages ranging up to rated voltages of 35 V and 16 V for tantalum and niobium oxide capacitors, respectively. Homogeneous distribution of oxygen vacancies acting as positive ions within the pentoxide layer was assumed before the experiments. DCL vs. time characteristics at a fixed temperature have several phases. At the beginning of ageing the DCL increases exponentially with time. In this period ions in the insulating layer are being moved in the electric field by drift only. Due to that the concentration of ions near the cathode increases producing a positively charged region near the cathode. The electric field near the cathode increases and the potential barrier between the cathode and insulating layer decreases which results in increasing DCL. However, redistribution of positive ions in the insulator layer leads to creation of a ion concentration gradient which results in a gradual increase of the ion diffusion current in the direction opposite to the ion drift current component. The equilibrium between the two for a given temperature and electric field results in saturation of the leakage current value. DCL vs. time characteristics are described by the exponential stretched law. We found that during the initial part of ageing an exponent n = 1 applies. That corresponds to the ion drift motion only. After long-time application of the electric field at a high temperature the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5. Here, the equilibrium between the ion drift and diffusion is achieved. The process of leakage current degradation is therefore partially reversible. When the external electric field is lowered, or the samples are shortened, the leakage current for a given voltage decreases with time and the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5, thus the ion redistribution by diffusion becomes dominant.

Numerical Analysis of Heated Soil Vapor Extraction System

2002 ◽  
Author(s):  
R. S. Jadhav ◽  
R. S. Amano ◽  
J. Jatkar ◽  
R. J. Lind
Keyword(s):  
High Temperature ◽  
Organic Compounds ◽  
Environmental Science ◽  
Numerical Study ◽  
Soil Vapor Extraction ◽  
Vapor Extraction ◽  
Element Analysis ◽  
Volatile Organic ◽  
Heated Soil ◽  
And Diffusion

An innovative and highly effective technique for remediation of soil has been developed—Heated Soil Vapor Extraction (HSVE), which is one of essential technologies that quickly and effectively remediates soil that is contaminated with organic compounds. The system efficiently uses the principles of heat transfer and diffusion to eliminate organic compounds from the soil. It basically consists of a high temperature heat source and a sink to take away the vaporized compounds in the presence of high temperature in the soil. A numerical study has been conducted to further strengthen the fact that the system is very effective, by actually modeling soil with system. Finite Element Analysis software ANSYS® has been used for the purpose of analysis. Such analysis will help environmental science and give new dimensions to soil remediation processes to clean soil off volatile organic compounds so that they can be carried out quickly, efficiently and economically.

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