Results 41 to 50 of about 41,858 (234)

Correlation between Zn vacancies and photoluminescence emission in ZnO films. [PDF]

, 2006
Photoluminescence and positron annihilation spectroscopy have been used to characterize and identify vacancy-type defects produced in ZnO films grown on sapphire by metal-organic chemical-vapor deposition. The photoluminescence of the samples in the near
A. Zubiaga, F. Plazaola, F. Tuomisto, J. A. García, J. Zuñiga Pérez, K. Saarinen, Kaldis E., V. Muñoz-Sanjosé   +7 more
core   +2 more sources

Positron Annihilation Spectroscopy in Materials and Technical Details of Measurement Systems [PDF]

فصلنامه علوم و فناوری فضایی, 2013
Being a very powerful method, Positron Annihilation Spectroscopy (PAS) has been widely used for investigation of defects type and concentration in materials in recent years.
A. A. Mehmandoost-Khajeh-Dad, M. Khaghani, M. Jafarzadeh-Khatibani   +2 more
doaj  

Detection of phase separation of neutron-irradiated Fe–Cr binary alloys using positron annihilation spectroscopy

Nuclear Materials and Energy, 2018
Phase separation in Fe–Cr binary alloys irradiated with neutrons at 473 K and 573 K was investigated using positron annihilation spectroscopy. Using positron annihilation coincidence Doppler broadening (CDB) measurements, the phase separation progress ...
Y. Noshita, K. Sato, H. Yamashita, R. Kasada, Q. Xu, M. Hatakeyama, S. Sunada   +6 more
doaj   +1 more source

Tracking defect-induced ferromagnetism in GaN:Gd [PDF]

, 2011
We report on the magnetic properties of GaN:Gd layers grown by molecular beam epitaxy (MBE). A poor reproducibility with respect to the magnetic properties is found in these samples.
Amilcar Bedoya-Pinto, Angela Rizzi, Christian Rauch, Filip Tuomisto, Joerg Malindretos, Martin Roever, Z. Lipinska   +6 more
core   +2 more sources

A study of vacancy defects related to gray tracks in KTiOPO4 (KTP) using positron annihilation

AIP Advances, 2014
For the first time to our knowledge, positron annihilation spectroscopy (PAS) was used to study vacancy defects in KTiOPO4 (KTP) single crystals. Positron annihilation lifetime spectroscopy combined with dielectric measurements identified the existence ...
Yang Zhang, Jing Li, Xingzhong Cao, Jing Yang, Jiyang Wang, Huaidong Jiang   +5 more
doaj   +1 more source

Development of a PbWO4 Detector for Single-Shot Positron Annihilation Lifetime Spectroscopy at the GBAR Experiment [PDF]

, 2019
We have developed a PbWO4 (PWO) detector with a large dynamic range to measure the intensity of a positron beam and the absolute density of the ortho-positronium (o-Ps) cloud it creates.
Choi, J. J., Chung, M., Clade, P., Comini, P., Crepin, P-P, Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Froehlich, P., Guellati, S., Heinrich, J., Hervieux, P-A, Hilico, L., Husson, A., Indelicato, P., Janka, G., Jonsell, S., Karr, J-P, Kim, B. H., Kim, E-S, Kim, S. K., Ko, Y., Kosinski, T., Kuroda, N., Latacz, B., Lee, H., Lee, J., Leite, A. M. M., Leveque, K., Lim, E., Liszkay, L., Lotrus, P., Louvradoux, T., Lunney, D., Manfredi, G., Mansoulie, B., Matusiak, M., Mornacchi, G., Nesvizhevsky, V. V., Nez, F., Niang, S., Nishi, R., Nourbaksh, S., Park, K. H., Paul, N., Perez, P., Radics, B., Regenfus, C., Reynaud, S., Rousse, J-Y, Rubbia, A., Rzadkiewicz, J., Sacquin, Y., Schmidt-Kaler, F., Staszczak, M., Tuchming, B., Vallage, B., van der Werf, D. P., Voronin, A., Welker, A., Wolf, S., Won, D., Wronka, S., Yamazaki, Y., Yoo, K-H   +66 more
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Quality of Heusler Single Crystals Examined by Depth Dependent Positron Annihilation Techniques

, 2014
Heusler compounds exhibit a wide range of different electronic ground states and are hence expected to be applicable as functional materials in novel electronic and spintronic devices.
Bauer, A, Böni, P, Ceeh, H, Eijt, S W H, Gigl, T, Hugenschmidt, C, Neubauer, A, Pfleiderer, C, Piochacz, C, Reiner, M, Schut, H, Weber, J   +11 more
core   +1 more source

Investigation of corrosion defects in titanium by positron annihilation

Nukleonika, 2015
The positron annihilation method was used to study the formation of defects in titanium samples during their corrosion in the vapor of a 3% HCl solution.
Pietrzak Ryszard, Szatanik Roman
doaj   +1 more source

Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy

APL Materials, 2013
Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where ...
L. Chai, W. Al-Sawai, Y. Gao, A. J. Houtepen, P. E. Mijnarends, B. Barbiellini, H. Schut, L. C. van Schaarenburg, M. A. van Huis, L. Ravelli, W. Egger, S. Kaprzyk, A. Bansil, S. W. H. Eijt   +13 more
doaj   +1 more source

Investigation of the chemical vicinity of crystal defects in ion-irradiated Mg and AZ31 with coincident Doppler broadening spectroscopy

, 2007
Crystal defects in magnesium and magnesium based alloys like AZ31 are of major importance for the understanding of their macroscopic properties. We have investigated defects and their chemical surrounding in Mg and AZ31 on an atomic scale with Doppler ...
A. Dupasquier, A. v. Veen, C. Hugenschmidt, C. Hugenschmidt, F. Pravdic, G. P. Williams, J. F. Ziegler, J. R. MacDonald, K. Schreckenbach, M. Stadlbauer, M. Stadlbauer, N. W. Ashcroft, P. Böni, P. Erhart, P. Skubisz, R. Krause-Rehberg, W. Bauer-Kugelmann, Y. Nagai   +17 more
core   +1 more source