Results 81 to 90 of about 40,261 (187)

Characterization of vacancy defects in Cu(In,Ga)Se2 by positron annihilation spectroscopy

AIP Advances, 2016
The photovoltaic performance of Cu(In1-x,Gax)Se2 (CIGS) materials is commonly assumed to be degraded by the presence of vacancy-related defects. However, experimental identification of specific vacancy defects remains challenging.
M. R. M. Elsharkawy, G. S. Kanda, M. V. Yakushev, E. E. Abdel-Hady, D. J. Keeble   +4 more
doaj   +1 more source

Catalytic Activity of Cobalt Ferrites in Water Oxidation Reactions and Its Defect Dependency

ChemCatChem, Volume 18, Issue 1, 15 January 2026.
Cobalt ferrite spinels calcined at 400–600 °C show temperature‐dependent changes in crystallinity, particle size, and defect concentration. A combination of PXRD, BET, SEM, Mössbauer spectroscopy, magnetometry, and PALS reveals how defect landscapes govern opposing trends in chemical versus electrochemical water oxidation.
Anna Rabe, Ahmed Gamal Attallah, Benedikt Eggert, Eric Hirschmann, Soma Salamon, Joachim Landers, Lea Kämmerer, Nicolas Cosanne, Adarsh Koul, Eko Budiyanto, Wolfgang Schuhmann, Malte Behrens, Heiko Wende   +12 more
wiley   +1 more source

Investigation of Surface Oxidation of Cast Austenitic 304 Stainless Steel at High Temperatures

Metals
The microstructure and surface behavior of iron-based 304 stainless steel after temperature exposure was studied by Mössbauer spectroscopy, powder X-ray diffraction, scanning electron microscopy, energy dispersive analysis and positron annihilation.
Tatiana Ivanova, Michal Kořenek, Miroslav Mashlan, Martin Fryšák   +3 more
doaj   +1 more source

Hydrogen response to high‐density dislocations in bulk perovskite oxide SrTiO3

Journal of the American Ceramic Society, Volume 109, Issue 1, January 2026.
High‐density dislocations are engineered into single‐crystal strontium titanate using cyclic Brinell indentation scratch tests at room temperature. These dislocations are found effective in uptaking hydrogen. Abstract Hydrogen plays an increasingly important role in green energy technologies. For instance, proton‐conducting oxides with high performance
Xufei Fang, Lars Dörrer, Svetlana Korneychuk, Maria Vrellou, Alexander Welle, Stefan Wagner, Astrid Pundt, Harald Schmidt, Christoph Kirchlechner   +8 more
wiley   +1 more source

Selective TREF Fraction Removal: A Method to Enhance Crystallinity and Microhardness in Propylene–1‐Pentene Copolymers

Advances in Polymer Technology, Volume 2026, Issue 1, 2026.
Innovative advancements in polyolefin chemistries are critically important to develop industrial applications that require an ability of either superior performance levels or minimal expense. While temperature rising elution fractionation (TREF) is a well‐established analytical technique for characterising polyolefin heterogeneity, its use as a ...
Muhamed A. Sweed, Ali Almaktoof, Srijoni Sengupta   +2 more
wiley   +1 more source

Photon correlations in positron annihilation

, 2010
The two-photon positron annihilation density matrix is found to separate into a diagonal center of energy factor implying maximally entangled momenta, and a relative factor describing decay.
Isabelle Gauthier, J. J. Sakurai, M. O. Scully, Margaret Hawton   +3 more
core   +1 more source

Research Progress of Microfluidics in Radiopharmaceutical Quality Control

iRADIOLOGY, Volume 3, Issue 6, Page 401-420, December 2025.
A complete PET imaging process includes five key steps: nuclide production, PET tracer synthesis, packaging, quality control and PET scanning. Taking the most classical synthesis process of [18F ]‐FDG tracer as an example, its synthesis process includes several core steps, such as: (1) the synthesis of [18F ]‐FDG Tracer, (2) the synthesis of [18F ]‐FDG
Zhenhao Dong, Qinggang He, Dilong Mao, Jing Wang, Hong Zhang   +4 more
wiley   +1 more source

On the positron annihilation spectroscopy and tensile behavior of COOH-MWCNT/epoxy nanocomposites [PDF]

Journal of Particle Science and Technology
Positron Annihilation Lifetime Spectroscopy (PALS) is sensitive to the material voids/free volume on the atomic scale. For this reason, this method has been used as a unique technology to measure the free volume and structural defects in polymers in ...
Mohammad Koohkan, Ali Akbar Mehmandoost Khajeh-Dad, Hamed Khosravi   +2 more
doaj   +1 more source

Positron annihilation induced Auger electron spectroscopy [PDF]

Recently, Weiss et al. have demonstrated that it is possible to excite Auger transitions by annihilating core electrons using a low energy (less than 30eV) beam of positrons.
Jensen, K. O., Koymen, A. R., Lee, K. H., Lei, Chun, Mehl, David, Weiss, Alex   +5 more
core   +1 more source

From polymer to SiOC glass: structure, microstructure, mechanical, and thermal properties

Journal of the American Ceramic Society, Volume 108, Issue 12, December 2025.
Abstract The transformation of a methyl‐siloxane into a SiOC glass in Ar and reactive CO2 atmosphere was studied through positron annihilation spectroscopy, infrared spectroscopy, density, and calorimetric measurements, whereas the mechanical properties were monitored by nanoindentation and the thermal diffusivity measured by the laser flash method ...
Mattia Biesuz, Adane M. Abebe, Levent Karacasulu, Sebastiano Mariazzi, Roberto S. Brusa, Daria Szewczyk, Nicola Pugno, Giacomo Sero, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Eric Hirschmann, Michele Cassetta, Gian D. Sorarù   +13 more
wiley   +1 more source