Trap level spectroscopic investigations of U: ZnAl 2 O 4 : Role of defect centres in the TSL process

2018 ◽  
Vol 114 ◽  
pp. 83-87 ◽  
Author(s):  
M. Mohapatra ◽  
Mithlesh Kumar ◽  
R.M. Kadam
Keyword(s):  
Trap Level ◽  
Spectroscopic Investigations ◽  
Defect Centres

scholarly journals Spectroscopic investigations of the role of Ge in modifying the Si to SiC conversion process

2008 ◽  
Vol 40 (3-4) ◽  
pp. 794-797 ◽  
Author(s):  
Jörg Pezoldt ◽  
Richard Nader ◽  
Charbel Zgheib ◽  
Gernot Ecke ◽  
Ralph Pieterwas ◽  
...  
Keyword(s):  
Conversion Process ◽  
Spectroscopic Investigations

Role of Clay-Solvent Inter and Intraparticle Interactions on Swelling Characteristics of Montmorillonite Nano-Meso-Micro Scale Particulate Systems

2001 ◽  
Vol 704 ◽  
Author(s):  
Dinesh R. Katti ◽  
Kalpana S. Katti ◽  
Vijayakumar Shanmugasundaram
Keyword(s):  
Swelling Pressure ◽  
Vibration Band ◽  
Band Shape ◽  
Electron Microscopic ◽  
Spectroscopic Investigations ◽  
Undisturbed Samples ◽  
Swelling Characteristics ◽  
The Relationship ◽  
Particulate Systems

AbstractThis paper deals with fundamental molecular issues related to macroscopic mechanical properties of nano-meso-microscale montmorillonite clay particulate systems. Molecular interaction of high aspect montmorillonite particles with solvents has large influence on resulting swelling characteristics in clays consisting of montmorillonite. A new controlled uniaxial swelling (CUS) cell is designed which allows a simultaneous measurement of swelling and swelling pressure in addition to ease of removal of undisturbed samples for electron microscopic and fourier transform infrared spectroscopic investigations. Our work shows that the swelling behavior of montmorillonite directly results from breakdown of large particles to smaller nano and meso scale particles with increased water incorporation in the interlayers. The Si-O vibration band regions of the montmorillonite spectra obtained at controlled amounts of swelling from 0-100% (where 0% swelling is defined as fully saturated samples under no volume change) show changes in band shape, intensity, and positions resulting from increased H-bonding in the interlayers and surface of montmorillonite particles. In addition, orientation dependant micro-attenuated total reflectance (ATR) spectroscopic investigations are also conducted on the controlled swelled samples. Our results indicate that the reduced particle size with increased swelling is related to increased misorientation of the montmorillonite platelets. The relationship between molecular interactions microstructure and macroscopic response (swelling and swelling pressure) is the key to development of novel nanocomposite systems based on montmorillonite with tailored properties.

The Effect of Annealing on Argon Implanted Edge Terminations for 4H-SiC Schottky Diodes

1999 ◽  
Vol 572 ◽  
Author(s):  
A P Knights ◽  
D J Morrison ◽  
N G Wright ◽  
C M Johnson ◽  
A G O'Neill ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Thermal Evolution ◽  
Deep Level ◽  
Schottky Diodes ◽  
Positron Annihilation Spectroscopy ◽  
Trap Level ◽  
Edge Termination ◽  
Low Temperature Annealing ◽  
Transient Spectroscopy

ABSTRACTThe edge termination of SiC by the implantation of an inert ion species is used widely to increase the breakdown voltage of high power devices. We report results of the edge termination of Schottky barrier diodes using 30keV Ar+ ions with particular emphasis on the role of postimplant, relatively low temperature, annealing. The device leakage current measured at 100V is increased from 2.5nA to 7μA by the implantation of 30keV Ar+ ions at a dose of 1×1015 cm−2. This is reduced by two orders of magnitude following annealing at 600°C for 60 seconds, while a breakdown voltage in excess of 750V is maintained. The thermal evolution of the defects introduced by the implantation was monitored using positron annihilation spectroscopy (PAS) and deep-level-transient spectroscopy (DLTS). While a concentration of open-volume defects in excess of 1×1019cm−3 is measured using PAS in all samples, electrically active trapping sites are observed at concentrations ∼1×1015cm−3 using DLTS. The trap level is well-defined at Ec−Et = 0.9eV.

The structural role of tungsten ions in PbO–Sb2O3–As2O3 glass-system by means of spectroscopic investigations

2006 ◽  
Vol 100 (2-3) ◽  
pp. 211-216 ◽  
Author(s):  
G. Little Flower ◽  
G. Sahaya Baskaran ◽  
N. Krishna Mohan ◽  
N. Veeraiah
Keyword(s):  
Glass System ◽  
Structural Role ◽  
Spectroscopic Investigations

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

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