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 +5 more
doaj +1 more source
Microstructure and luminescent properties of Eu3+-activated MgGa2O4:Mn2+ ceramic phosphors
Journal of Advanced Ceramics, 2020 Mn2+ and the trivalent europium (Eu3+)-doped MgGa2O4 ceramics are characterized using a multi-experimental approach. The formation of spinel-structured ceramics is ascertained from X-ray diffraction (XRD) analysis.
A. Luchechko +8 more
doaj +1 more source
Proposition of Hyper-Chemical Exchange Saturation Transfer Subtraction Spectroscopy to Detect Very Weak and Broad Signals Hidden Under Baseline and Widen Range of Materials Accessed by Hyperpolarized <sup>129</sup>Xe NMR. [PDF]
ChemphyschemA polyimide sample, for which hyperpolarized 129Xe NMR spectroscopy failed to detect 129Xe embedded in the polymer (Inset A), is found to give a very broad peak, line width 11 kHz at 206.5 ppm, by applying the stopped‐flow hyper‐chemical exchange saturation transfer subtraction spectroscopy on the continuous‐flow recirculating hyper‐polarization system
Fujiwara H, Imai H, Kimura A.
europepmc +2 more sources
Potential for biomedical applications of Positron Annihilation Lifetime Spectroscopy (PALS)
, 2018 Positron Annihilation Lifetime Spectroscopy (PALS) allows examining structure of materials in nano and sub-nanometer scale. This technique is based on the lifetime and intensity of ortho-positronium atoms in free volumes of given structures. It is mostly
Kubicz, Ewelina
core +1 more source
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 +4 more
doaj +1 more source
Selective Production of Rydberg-Stark States of Positronium [PDF]
, 2015 Rydberg positronium (Ps) atoms have been prepared in selected Stark states via two-step (1s→2p→nd/ns) optical excitation. Two methods have been used to achieve Stark-state selection: a field ionization filter that transmits the outermost states with ...
Alonso, AM +5 more
core +2 more sources
, 2017 Free Volume of PVA/SSA Proton Exchange Membrane Studied by Positron Annihilation Lifetime Spectroscopy M.M. Gomaaa,b,∗, C. Hugenschmidt, M. Dickmann, M.O. Abdel-Hamed, E.E. Abdel-Hady and H.F.M.
Mahmoud M. Gomaa +5 more
openalex +2 more sources
Metal Nanoclusters for Cancer Imaging and Treatment
Advanced Functional Materials, EarlyView.This review aims to provide a comprehensive summary and discussion of the core–shell design capabilities of metal nanoclusters (NCs) at the atomic level for cancer imaging and treatment. It offers essential insights into the design principles of metal NCs while also encouraging the exploration of other nanomaterials and their potential theranostic ...
Haiguang Zhu +5 more
wiley +1 more source
Study the structure of nanodiamonds by electron-positron annihilation after adding a certain amount of cyclic hydrogen [PDF]
, 2017 Nanodiamond samples with various densities were studied by positron annihilation spectroscopy with the aim of finding out the hydrogen saturation effect on nanodiamonds.
Гулидова, Людмила Владимировна +1 more
core
Defect Analysis of the β– to γ–Ga2O3 Phase Transition
Advanced Functional Materials, EarlyView.The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas +9 more
wiley +1 more source