Hydrogen diffusion in amorphous Cu50Ti50 studied by positron-annihilation spectroscopy

1988 ◽  
Vol 66 (6) ◽  
pp. 476-477 ◽  
Author(s):  
R. A. Dunlap ◽  
A. M. Putnam ◽  
D. S. Vardy
Keyword(s):  
Amorphous Alloy ◽  
Positron Annihilation ◽  
Momentum Distribution ◽  
Hydrogen Diffusion ◽  
Positron Annihilation Spectroscopy ◽  
Crystalline Alloy ◽  
Hydrogenated Amorphous ◽  
Trapping Sites

Positron-annihilation spectroscopy has been used to study the density of trapping sites in amorphous and crystalline Cu50Ti50. The effects of hydrogenation on the positron-annihilation spectrum in the amorphous alloy are also investigated. It is shown that the amorphous alloy has a higher concentration of trapping sites than the crystalline alloy and that in the hydrogenated amorphous alloy, the positrons are annihilated by electrons having a momentum distribution that is very nearly the same as in the crystalline alloy.

Identification of Vacancy-Like Defects in High-Rate Grown a-Si Before and After Light Soaking by Vepas

1998 ◽  
Vol 507 ◽  
Author(s):  
X. Zou ◽  
Y. C. Chan ◽  
D. P. Webb ◽  
Y. W. Lam ◽  
S. H. Lin ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Structural Changes ◽  
Positron Annihilation Spectroscopy ◽  
High Rate ◽  
Light Illumination ◽  
Vacancy Clusters ◽  
Before And After ◽  
New Type ◽  
Staebler Wronski Effect ◽  
Hydrogenated Amorphous

ABSTRACTWe show how positron annihilation can distinguish vacancies in undoped hydrogenated amorphous silicon by performing Variable Energy Positron Annihilation Spectroscopy experiments before and after light soaking. We find that vacancy clusters, di-vacancies and a new type of single vacancies are created in undoped as-grown a-Si:H thin film by light illumination. The fact that the vacancy clusters are eliminated by the thermal annealing suggests that the Staebler-Wronski effect is closely related to vacancy clusters in a-Si:H material. The creation of vacancy clusters and redistribution of di-vacancies and even single vacancies probably result in photo-induced structural changes in this material.

Characterizing Native Point Defects in ZnO Bulk by Positron Annihilation Spectroscopy

2008 ◽  
Vol 607 ◽  
pp. 137-139
Author(s):  
C.X. Peng ◽  
Hui Min Weng ◽  
K.F. Wang ◽  
F.L. Guo ◽  
B.J. Ye ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Point Defects ◽  
Momentum Distribution ◽  
Oxygen Vacancies ◽  
Positron Lifetime ◽  
Annealing Treatment ◽  
Positron Annihilation Spectroscopy ◽  
Electron Momentum ◽  
Electron Momentum Distribution ◽  
Native Point Defects

Positron annihilation spectroscopy was employed to study the native point defects in ZnO single crystal, in combination with calculated results of positron lifetime and electron momentum distribution. The theoretical and experimental results of the positron lifetime in ZnO bulk ensure the presence of zinc monovacancy, and zinc monovacancy concentration begins to decrease above 600oC annealing treatment. Oxygen vacancies have been characterized by coincidence Doppler broadening (CDB) spectroscopy, combined with calculated electron momentum distribution. CDB spectroscopies show that oxygen vacancies don't appear until 600oC annealing treatment, and increase due to ZnO decomposition with annealing temperature rising.

scholarly journals Investigation on annealed Fe43Co43Hf7B6Cu1 amorphous alloy by positron annihilation spectroscopy

2011 ◽  
Vol 60 (1) ◽  
pp. 017504
Author(s):  
Chao Yue-Sheng ◽  
Guo Hong ◽  
Gao Xiang-Yu ◽  
Luo Li-Ping ◽  
Zhu Han-Xian
Keyword(s):  
Amorphous Alloy ◽  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy

scholarly journals Native vacancy defects in Zn1−x(Mn,Co)xGeAs2 studied with positron annihilation spectroscopy

2009 ◽  
Vol 106 (1) ◽  
pp. 013524 ◽  
Author(s):  
L. Kilanski ◽  
A. Zubiaga ◽  
F. Tuomisto ◽  
W. Dobrowolski ◽  
V. Domukhovski ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy ◽  
Vacancy Defects

scholarly journals Positron annihilation spectroscopy on a beam of positrons the LEPTA facility

2016 ◽  
Vol 132 ◽  
pp. 03014
Author(s):  
E.V. Ahmanova ◽  
M.K. Eseev ◽  
A.G. Kobets ◽  
I.N. Meshkov ◽  
O.S. Orlov ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy

scholarly journals Direct evidence of impurity decoration of Ga vacancies inGaNfrom positron annihilation spectroscopy

2006 ◽  
Vol 73 (19) ◽  
Author(s):  
S. Hautakangas ◽  
I. Makkonen ◽  
V. Ranki ◽  
M. J. Puska ◽  
K. Saarinen ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Direct Evidence ◽  
Positron Annihilation Spectroscopy
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