Measurements of the vacancy formation enthalpy in aluminum using positron annihilation spectroscopy

1978 ◽  
Vol 17 (9) ◽  
pp. 3444-3455 ◽  
Author(s):  
M. J. Fluss ◽  
L. C. Smedskjaer ◽  
M. K. Chason ◽  
D. G. Legnini ◽  
R. W. Siegel
Keyword(s):  
Positron Annihilation ◽  
Formation Enthalpy ◽  
Positron Annihilation Spectroscopy ◽  
Vacancy Formation

Positron Annihilation Studies of Vacancy Formation in Tungsten, Chromium, and Niobium

1984 ◽  
Vol 41 ◽  
Author(s):  
L. C. Smedskjaer ◽  
G. D. Loper ◽  
M. K. Chason ◽  
R. W. Siegel
Keyword(s):  
Positron Annihilation ◽  
High Vacuum ◽  
Formation Enthalpy ◽  
Positron Annihilation Spectroscopy ◽  
Ultra High Vacuum ◽  
Vacancy Formation ◽  
Self Diffusion ◽  
Melting Temperatures ◽  
Bcc Metals ◽  
Diffusion Studies

AbstractVacancy formation was studied in the refractory bcc metals, tungsten, chromium, and niobium, using the positron annihilation spectroscopy Doppler broadening technique, between room temperature and the respective melting temperatures, under ultra-high vacuum conditions. Temperatures were measured by optical and infrared pyrometry, a W(Rh) thermocouple, and the power delivered to the sample, with calibrations against known melting temperatures. For W, a trapping-model analysis of the data from the temperature range 300–3633 K yielded a vacancy formation enthalpy of 3.76 ± 0.39 eV. For Cr, a similar fit to the data from 296–2049 K yielded a vacancy formation enthalpy of 2.0 ± 0.2 eV. The results are discussed in relation to previous vacancy formation and self-diffusion studies. Measurements on Nb as a function of temperature and oxygen content are also presented.

Effect of Hydrogen on Vacancy Formation in Sputtered Cu Films Studied by Positron Annihilation Spectroscopy

2013 ◽  
Vol 52 (4R) ◽  
pp. 046501 ◽  
Author(s):  
Atsushi Yabuuchi ◽  
Teruo Kihara ◽  
Daichi Kubo ◽  
Masataka Mizuno ◽  
Hideki Araki ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy ◽  
Vacancy Formation ◽  
Cu Films

The vacancy formation enthalpy in Ni determined by positron annihilation

1981 ◽  
Vol 11 (11) ◽  
pp. 2221-2230 ◽  
Author(s):  
L C Smedskjaer ◽  
M J Fluss ◽  
D G Legnini ◽  
M K Chason ◽  
R W Siegel
Keyword(s):  
Positron Annihilation ◽  
Formation Enthalpy ◽  
Vacancy Formation

The composition dependence of the effective vacancy formation enthalpy in copper-rich brass as deduced from the threshold temperature for positron trapping in vacancies

1978 ◽  
Vol 56 (8) ◽  
pp. 1077-1083 ◽  
Author(s):  
P. J. Schultz ◽  
T. E. Jackman ◽  
J. Fabian ◽  
E. A. Williams ◽  
J. R. MacDonald ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Positron Annihilation ◽  
Composition Dependence ◽  
Formation Enthalpy ◽  
Vacancy Formation ◽  
Threshold Temperature ◽  
Α Phase ◽  
Linear Decrease ◽  
Zn Concentration ◽  
Bcc Structure

The temperature dependence of the Doppler-broadened positron annihilation lineshape has been measured for 13 brass specimens with compositions varying from 0 to 48% by weight of Zn. The vacancy formation enthalpy deduced from these measurements shows a linear decrease of 22% with increasing Zn concentration through the α phase and a further 31% decrease on changing from fcc to bcc structure.

Positron annihilation measurement of the vacancy formation enthalpy in copper

1980 ◽  
Vol 10 (8) ◽  
pp. 1763-1774 ◽  
Author(s):  
M J Fluss ◽  
L C Smedskjaer ◽  
R W Siegel ◽  
D G Legnini ◽  
M K Chason
Keyword(s):  
Positron Annihilation ◽  
Formation Enthalpy ◽  
Vacancy Formation

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
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