Positron lifetime analysis of dislocations arising from tensile strain

1996 ◽  
Vol 8 (16) ◽  
pp. 2815-2822 ◽  
Author(s):  
K Petersen ◽  
I A Repin ◽  
G Trumpy
Keyword(s):  
Tensile Strain ◽  
Positron Lifetime ◽  
Lifetime Analysis

Positron Lifetime Analysis of Polyurea-Nanoclay Composites

2012 ◽  
pp. 361-365
Author(s):  
Naidu V. Seetala ◽  
Gabriel Burks ◽  
Danny Hubbard ◽  
Alex Trochez ◽  
Valéry N. Khabashesku
Keyword(s):  
Positron Lifetime ◽  
Lifetime Analysis

Positron annihilation measurements in high energy alpha irradiated undoped indium antimonide

2014 ◽  
Vol 28 (30) ◽  
pp. 1450210 ◽  
Author(s):  
Sandip Pan ◽  
Arunava Mandal ◽  
Subrata Mukherjee ◽  
Achintya Kumar Saha ◽  
Anirban Roychowdhury ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Temperature Region ◽  
Indium Antimonide ◽  
Line Shape ◽  
Room Temperature ◽  
Positron Lifetime ◽  
High Energy ◽  
Isochronal Annealing ◽  
Positron Annihilation Lifetime ◽  
Lifetime Analysis

Positron annihilation lifetime spectroscopy and Doppler broadening annihilation line-shape measurements were carried out in 40 MeV alpha-irradiated undoped InSb. After irradiation the sample was subjected to an isochronal annealing over temperature region of 25°C–400°C with annealing time of 30 min at each set temperature. After each annealing the positron measurements were carried out at room temperature. Formation of radiation induced defects and their recovery with annealing temperature were investigated. A three component positron lifetime analysis was undertaken to observe the trapping of positrons in the sample after irradiation and during annealing. The average positron lifetime value τ avg = 313 ps at room temperature after irradiation indicated the presence of defects and the high value of τ2 at room temperature suggested that the probable defects were divacancies. A two stage recovery of defects was observed during post irradiation isochronal annealing over the temperature region 25°C–400°C. The variations in line-shape parameter (S) and defect specific parameter (R) during annealing in the temperature region 25°C–400°C resembled the behavior of τ avg indicating the migration of vacancies, formation of vacancy clusters and the disappearance of defects between 300°C to 400°C.

Melt 4.0 a Program for Positron Lifetime Analysis

1997 ◽  
Vol 255-257 ◽  
pp. 233-237 ◽  
Author(s):  
Arun Shukla ◽  
L. Hoffmann ◽  
Alfred A. Manuel ◽  
M. Peter
Keyword(s):  
Positron Lifetime ◽  
Lifetime Analysis

Influence exerted by underground excavation shape and by effective stresses on the formation of a tensile strain zone at a depth greater than 1 km

2020 ◽  
pp. 67-75
Author(s):  
Van Min Nguyen ◽  
V. A. Eremenko ◽  
M. A. Sukhorukova ◽  
S. S. Shermatova
Keyword(s):  
Rock Mass ◽  
Cross Sections ◽  
Tensile Strain ◽  
Rock Fracture ◽  
Strain Analysis ◽  
Surrounding Rock ◽  
Underground Excavation ◽  
Secondary Stress ◽  
Principal Stresses ◽  
Mining Depth

The article presents the studies into the secondary stress field formed in surrounding rock mass around underground excavations of different cross-sections and the variants of principal stresses at a mining depth greater than 1 km. The stress-strain analysis of surrounding rock mass around development headings was performed in Map3D environment. The obtained results of the quantitative analysis are currently used in adjustment of the model over the whole period of heading and support of operating mine openings. The estimates of the assumed parameters of excavations, as well as the calculations of micro-strains in surrounding rock mass by three scenarios are given. During heading in the test area in granite, dense fracturing and formation of tensile strain zone proceeds from the boundary of e ≥ 350me and is used to determine rough distances from the roof ( H roof) and sidewalls ( H side) of an underground excavation to the 3 boundary e = 350me (probable rock fracture zone). The modeling has determined the structure of secondary stress and strain fields in the conditions of heading operations at great depths.

GeSn Lasers with Uniaxial Tensile Strain in the Gain Medium

2019 ◽  
Author(s):  
Mathieu Bertrand ◽  
Francesco Armand Pilon ◽  
Vincent Reboud ◽  
Hans Sigg ◽  
Quang-Minh Thai ◽  
...  
Keyword(s):  
Tensile Strain ◽  
Gain Medium ◽  
Uniaxial Tensile
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