The study of positron annihilation lifetime spectroscopy and X-ray diffraction on oxygen irradiated textured polycrystalline Bi2Sr2CaCu2O8+δ and Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+δ superconductors

2002 ◽  
Vol 302 (5-6) ◽  
pp. 330-335 ◽  
Author(s):  
Pintu Sen ◽  
S.K. Bandyopadhyay ◽  
P.M.G. Nambissan ◽  
P. Barat ◽  
P. Mukherjee
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Positron Annihilation Lifetime

scholarly journals Convenient Preparation of Graphene Oxide from Expandable Graphite and Its Characterization by Positron Annihilation Lifetime Spectroscopy

2019 ◽  
Vol 5 (1) ◽  
pp. 6 ◽  
Author(s):  
Guido Panzarasa ◽  
Giovanni Consolati ◽  
Marco Scavini ◽  
Mariangela Longhi ◽  
Fiorenza Quasso
Keyword(s):  
Graphene Oxide ◽  
Positron Annihilation ◽  
Nitrogen Adsorption ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Expandable Graphite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Convenient Preparation ◽  
Extract Information

Graphene oxide (GO) is conveniently prepared from expandable graphite using a simplified Hummers’ method. The product is thoroughly characterized by usual techniques (UV-vis, Fourier-transform infrared (FTIR) and Raman spectroscopies, zeta potential, electron microscopy, X-ray diffraction, nitrogen adsorption) to confirm the success of synthesis. Positron annihilation lifetime spectroscopy (PALS) is then used to extract information on the microenvironment in between the layers of graphene oxide.

A Preliminary Study of Oxidation Behavior of Mo-50Re Alloy at Different Temperature Using Positron Annihilation Lifetime Spectroscopy

2017 ◽  
Vol 373 ◽  
pp. 134-137
Author(s):  
Zhe Jie Zhu ◽  
Wei Yang ◽  
Jian Jian Shi ◽  
Tong Guang Zhai ◽  
Yi Chu Wu
Keyword(s):  
Oxide Film ◽  
Positron Annihilation ◽  
Interface Layer ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Interfacial Defects ◽  
Preliminary Study ◽  
Orthogonal Phase

The oxidized Mo-50Re alloys in air at 573 K and 873 K for various times were investigated by X-Ray diffraction and positron annihilation lifetime spectroscopy. The results indicated that main orthogonal phase MoO3 together with small amount of monoclinic phase Mo8O23 were formed on on the surface of the specimens, and the oxide film of specimens oxidized at 873 K were much thicker than that of specimens oxidized at 573 K. Meanwhile, when Mo-50Re specimens oxidized in air at 873K, the defect’s size within interface layer of the specimens was larger, and the oxide film on the surface of the specimens contained much more defects. Faster oxidation process were observed occured at 873K, which was likely due to the formation of larger-size interfacial defects.

Structural study of Zn-exchanged natural clinoptilolite using powder XRD and positron annihilation data

Clay Minerals ◽  
2015 ◽  
Vol 50 (1) ◽  
pp. 41-54 ◽  
Author(s):  
L.T. Dimowa ◽  
O.E. Petrov ◽  
N.I. Djourelov ◽  
B.L. Shivachev
Keyword(s):  
Positron Annihilation ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Size Fractionation ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Structural Details ◽  
Natural Clinoptilolite ◽  
Clinoptilolite Tuff

AbstractZn-exchanged natural clinoptilolite was studied by powder X-ray diffraction and positron annihilation lifetime spectroscopy. The original clinoptilolite tuff was subjected to size fractionation by sedimentation and dissolution of cristobalite (opal-C). After Zn2+-exchange the purified clinoptilolite sample contained 2.2 Zn2+ ions per unit cell. Structural details obtained by Rietveld refinement showed that the Zn2+ cations are located in three sites (Zn1, Zn2 and Zn3) in the channels of the clinoptilolite. Site Zn1 is located in the centre of channel-A (Mg2+-M4 site). Site Zn2 is in channel-B, next to the calcium M2 position. A new Zn3 site is located in channel-A, in imminent proximity to Zn1. Positron Annihilation Lifetime Spectroscopy (PALS) was employed to assess the Zn exchange. As the cation content influences the free volume of the channels, the ionexchange process can be monitored by PALS. The results suggest the existence of two sizes of cavities, in accordance with the structural refinement.

Defect evolution in Eu3+, Nb5+ doped and co-doped CeO2: X-ray diffraction, positron annihilation lifetime and photoluminescence studies

2019 ◽  
Vol 6 (8) ◽  
pp. 2167-2177 ◽  
Author(s):  
K. Sudarshan ◽  
V. Tiwari ◽  
P. Utpalla ◽  
S. K. Gupta
Keyword(s):  
Positron Annihilation ◽  
Rietveld Refinement ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Doped Ceo2 ◽  
Photoluminescence Studies ◽  
Co Doped

Defects and their influence on light emitting properties were explored in CeO2:Eu,Nb using Rietveld refinement, positron annihilation and luminescence spectroscopy.

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