Results 61 to 70 of about 42,514 (244)

Observation of a shape resonance of the positronium negative ion

Nature Communications, 2016
The Positronium negative ion is formed by two electrons bound to a positron, and experimental investigations of its states and energy levels are difficult due to its short lifetime.
Koji Michishio, Tsuneto Kanai, Susumu Kuma, Toshiyuki Azuma, Ken Wada, Izumi Mochizuki, Toshio Hyodo, Akira Yagishita, Yasuyuki Nagashima   +8 more
doaj   +1 more source

Distribution of Positron Annihilation Lifetime Components

مجلة بغداد للعلوم, 2008
The intensities of the positron annihilation lifetime components are shown to be related to the free volume model, and the theoretical value of the ratio between the singlet to the triplet state intensities, described by the ratio η, is shown to follow ...
Ahmed Abdul-Razzaq Selman, Muna Ahmed Saeed   +1 more
doaj   +1 more source

Application Progress of PALS in the Correlation of Structure and Properties for Graphene/Polymer Nanocomposites

Nanomaterials, 2022
Giving a deep insight into the microstructure, and realizing the correlation between microstructure and properties is very important to the precise construction of high-performance graphene/polymer nanocomposites (GPN).
Xiaobing Han, Jie Gao, Tao Chen, Libing Qian, Houhua Xiong, Zhiyuan Chen   +5 more
doaj   +1 more source

Structure‐Function Integration in 2D Hybrid Perovskite for Fast Neutron and Gamma Ray Discrimination

Advanced Science, EarlyView.
Using an in situ seed‐assisted cooling method, large (28 × 7 × 3 mm3) (GABA)2PbBr4 single crystals are grown, featuring hydrogen‐rich organic layers and a dense PbBr4 framework. This architecture enables efficient γ‐ray absorption, fast‐neutron sensitivity, and clear n/γ pulse‐shape discrimination (FOM up to 1.74), highlighting its potential as a ...
Yingming Wang, Lingyan Xu, Chongqi Liu, Lu Liang, Binghui Zhang, Zhentao Qin, Lixiang Lian, Wei Zheng, Yanyan Lei, Qinzeng Hu, Shuai Song, Chaopeng Mi, Tao Wang, Yadong Xu, Gangqiang Zha, Wanqi Jie   +15 more
wiley   +1 more source

Structural Defects in TiNi-Based Alloys after Warm ECAP

Metals, 2020
The microstructure, martensitic transformations and crystal structure defects in the Ti50Ni47.3Fe2.7 (at%) alloy after equal-channel angular pressing (ECAP, angle 90°, route BC, 1–3 passes at T = 723 K) have been investigated.
Aleksandr Lotkov, Anatoly Baturin, Vladimir Kopylov, Victor Grishkov, Roman Laptev   +4 more
doaj   +1 more source

Stability of vacancies in β-type Ti-15Mo-5Zr-3Al alloy fabricated via laser powder bed fusion

Additive Manufacturing Letters, 2023
The structural instability in the β-type titanium alloys could affect the stability of vacancies. The stability of vacancies in a β-type Ti-15Mo-5Zr-3Al alloy, fabricated via laser powder bed fusion (LPBF), was investigated using positron annihilation ...
Masataka Mizuno, Kazuki Sugita, Kousuke Do, Takuya Ishimoto, Takayoshi Nakano, Hideki Araki   +5 more
doaj   +1 more source

Positron annihilation lifetime spectroscopy of ZnO bulk samples [PDF]

Physical Review B, 2007
In order to gain a further insight into the knowledge of point defects of ZnO, positron annihilation lifetime spectroscopy was performed on bulk samples annealed under different atmospheres. The samples were characterized at temperatures ranging from 10 to 500 K.
Zubiaga, A., Plazaola, F., Garcia, J.A., Tuomisto, Filip, Munoz-San Jose, V., Tena-Zaera, R.   +5 more
openaire   +2 more sources

Membrane Engineering for Battery Systems: Bridging Design Principles and Frontier Applications

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
The review emphasizes membrane separators' role in battery performance and safety, covering redox flow, lithium‐ion, and solid‐state batteries. It reviews advances in membrane materials (e.g., polymer electrolytes, hybrid composites) and ion transport mechanisms, while addressing challenges like dendrite growth and crossover losses.
Xiaoqun Zhou, Justice Delali Akoto, Rui Tan, Jun Ma   +3 more
wiley   +1 more source

Comparison of the Coating Structure of Silicon‐Based PECVD Coatings With Varying Organic Content

Plasma Processes and Polymers, EarlyView.
Silicon‐based PECVD coatings transition abruptly from organic SiOCH to oxidic SiOx at ~32 at% silicon, exhibiting threshold behavior in barrier performance. Chemical composition seems to dominate over porosity: SiOx coatings unexpectedly show higher porosity yet superior barrier properties, possibly due to rigid cage‐like molecular structures ...
Jonas Franke, Maciej Oskar Liedke, Andreas Schäfer, Maik Butterling, Ahmed Gamal Attallah, Eric Hirschmann, Andreas Wagner, Rainer Dahlmann   +7 more
wiley   +1 more source

Vacancy‐Type Defects in n‐Type GaN Fabricated by Low‐Dose Ion Implantation Studied by a Monoenergetic Positron Beam

physica status solidi (b), EarlyView.
Vacancies in low‐dose ion‐implanted GaN are studied by positron annihilation. Depth profiles of the net donor concentration (ND) are close to those for implanted impurities, but ND is 2–3 times higher than concentrations of implanted ions. The origin of donor‐like defects is expected to be N‐vacancy‐related defects, and Ga‐vacancy‐type defects play a ...
Akira Uedono, Hiroko Iguchi, Masahiro Horita, Jun Suda, Kohei Shima, Shigefusa F. Chichibu, Shoji Ishibashi   +6 more
wiley   +1 more source