Results 181 to 190 of about 1,787,488 (253)

Positron lifetime spectroscopy applied to pure Tellurium [PDF]

Indian Journal of Physics, 2021
AbstractHigh-purity crystalline Tellurium has been investigated using positron lifetime spectroscopy technique in order to determine basic information missing in the current experimental knowledge of the positron annihilation spectroscopy field. Three different pairs of samples have been studied in the as-received state and, in order to eliminate the ...
Ricardo Dominguez Reyes
exaly   +5 more sources

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Positron Annihilation Lifetime and Doppler Broadening Spectroscopy of polymers

Radiation Physics and Chemistry, 2020
Positron Annihilation Lifetime and Doppler Broadening spectroscopy of positron annihilation radiation are performed in four different polymers. The size of elementary free volume sites and their chemical environments are determined.
A. Biganeh, O. Kakuee, H. Rafi‐Kheiri, M. Lamehi-rachti, N. Sheikh, E. Yahaghi   +5 more
semanticscholar   +2 more sources

Defect Study in CoCrFeMnNi High Entropy Alloy by Positron Annihilation Lifetime Spectroscopy

Physica Status Solidi (A) Applications and Materials Science, 2018
Reinhard Krause-Rehberg, Mohamed Elsayed, Bernd Kieback   +2 more
exaly   +2 more sources

Positron lifetime spectroscopy of lithium tetraborate Li 2 B 4 O 7 glass

Journal of Non-Crystalline Solids, 2017
Abstract Free-volume structure of glassy lithium tetraborate Li2B4O7 is studied as compared with isocompositional crystal using positron annihilation lifetime spectroscopy in mixed positron-trapping and Ps-decaying modes exploring three-term decomposed positron lifetime spectra.
O. Shpotyuk, V. Adamiv, I. Teslyuk, A. Ingram   +3 more
semanticscholar   +2 more sources

Positron lifetime spectroscopy in copper

Journal of Physics F: Metal Physics, 1986
The temperature dependence of positron annihilation in copper was investigated by measuring the positron lifetime between 20 and 1070 degrees C. A high-resolution lifetime spectrometer (FWHM 170 ps) with a stability better than +or-1.5 ps over a period of four weeks was used.
T Hehenkamp, T Kurschat, W Luhr-Tanck
openaire   +1 more source

Detection of tribolayer in different metals using positron lifetime spectroscopy

Tribology International, 2019
Investigation of the positron lifetime depth profile in pure iron, copper, stainless steel and silver alloy subjected to a dry sliding test have been performed. Near the worn surface, at the depth less than 10 μm the so called tribolayer is visible.
J. Dryzek
semanticscholar   +1 more source

The Influence of Free Volume Determined by Positron Annihilation Lifetime Spectroscopy (PALS) on Gas Permeability of Cellulose Nanocrystals Films.

ACS Applied Materials and Interfaces, 2020
Cellulose nanocrystals (CNCs) are of increasing interest for packaging applications because of their biodegradability, low cost, high crystallinity and high aspect ratio. The objective of this study was to use positron annihilation lifetime spectroscopy (
M. Nuruddin, Reaz A. Chowdhury, N. Lopez-Perez, Francisco Montes, J. Youngblood, J. Howarter   +5 more
semanticscholar   +1 more source

Positron lifetime spectroscopy of vitreous B2O3

Journal of Non-Crystalline Solids, 2004
Abstract A comparison is made of the structural data obtained by positron lifetime spectroscopy (PLS) for vitreous B 2 O 3 (v-B 2 O 3 ) and crystalline B 2 O 3 (c-B 2 O 3 ). Samples of v-B 2 O 3 were dried by holding the melt at 1350 K to reduce residual OH groups.
B.L. Shivachev, I.P. Mincov, E.P. Kashchieva, Y.B. Dimitriev, R. Smith, T. Troev   +5 more
openaire   +1 more source

Observation of the Recrystallization Process in Pure Nb and Zr Using Positron Lifetime Spectroscopy and XRD Techniques

physica status solidi (b), 2018
Results of research on the recrystallization of highly deformed Nb and Zr with the use of positron lifetime spectroscopy and XRD measurements are presented here.
J. Dryzek, M. Wróbel
semanticscholar   +1 more source

Correlation between photoluminescence and positron annihilation lifetime spectroscopy to characterize defects in calcined MgO nanoparticles as a first step to explain antibacterial activity

Journal of Alloys and Compounds, 2020
Many studies discussed the potential antibacterial activity of MgO nanoparticles; however, there is no clarity about ideal calcination temperature for MgO nanoparticles.
A. El-Shaer, M. Abdelfatah, K. Mahmoud, Sanaa Momay, M. R. Eraky   +4 more
semanticscholar   +1 more source