Optical and structural properties of Li2O–Al2O3–B2O3 glasses before and after γ-irradiation effects

2008 ◽  
Vol 104 (10) ◽  
pp. 103515 ◽  
Author(s):  
D. Singh ◽  
K. Singh ◽  
B. S. Bajwa ◽  
G. S. Mudahar ◽  
D. P. Singh ◽  
...  
Keyword(s):  
Structural Properties ◽  
Irradiation Effects ◽  
Γ Irradiation ◽  
Before And After

Changes in structural and optical properties due to γ-irradiation of MgO nanoparticles

2020 ◽  
Vol 108 (4) ◽  
pp. 315-320
Author(s):  
Maryam Amini ◽  
Mohammad Hossein Majles Ara
Keyword(s):  
Optical Properties ◽  
Dose Rate ◽  
Structural Properties ◽  
Gamma Spectroscopy ◽  
Hexagonal Lattice ◽  
Crystal Defects ◽  
Γ Irradiation ◽  
Mgo Nanoparticles ◽  
Before And After ◽  
Γ Ray

AbstractIn this research, the influence of γ-irradiation on the optical and structural properties of magnesium oxide (MgO) nanoparticles was studied. The MgO nanoparticles were irradiated with doses 100 Gy, 1 kGy, 10 kGy and 20 kGy from 60Co source. The as-synthesized samples of MgO nanoparticles prepared by the sol-gel technique were analyzed by XRD which suggested the double phase; cubic and hexagonal structures of the material. The crystal defects that produced in the cubic and hexagonal lattice were studied before and after 60Co γ-irradiation in a gamma cell by different dose rates in order to report the changes in structural properties of the MgO nanoparticles. The irradiated and un-irradiated samples were characterized by XRD and UV–Vis. The XRD pattern of MgO nanoparticles is showed that the crystal size of MgO nanoparticles being increased with increasing the γ-ray dose rate. For optical absorption, the UV–Visible absorption spectra of MgO nanoparticles are showed that when the dose rate is increased, the value of band gap is decreased. Also, the experimental values of the mass attenuation coefficient of MgO nanoparticles have been calculated before and after γ-irradiation by using the gamma spectroscopy method. Therefore, the results are showed that γ-ray irradiation has various effects on structural, morphological and optical properties.

Photolytic and thermal annealing of radical anions gamma-irradiated monocarboxylic acids

1979 ◽  
Vol 44 (12) ◽  
pp. 3632-3643 ◽  
Author(s):  
Karel Mach ◽  
Igor Janovský ◽  
Karel Vacek
Keyword(s):  
Thermal Annealing ◽  
Pivalic Acid ◽  
Esr Spectra ◽  
Paramagnetic Species ◽  
Radical Anions ◽  
Γ Irradiation ◽  
Before And After ◽  
Optical Bleaching ◽  
The Difference ◽  
Gamma Irradiated

Total yields of paramagnetic species, their optical bleaching and thermal annealing in acetic, propionic, a-butyric, isobutyric, and pivalic acid γ-irradiated at 77 K were followed by ESR spectroscopy. Radical anions, always found after irradiation, disappear during optical bleaching without formation of any paramagnetic product. During thermal annealing they are converted almost quantitatively into the α-radicals of the respective acid, with the exception of pivalic acid. Amounts of radical anions were estimated from the difference of integrated ESR spectra taken before and after optical bleaching. The results show that approximately equal amounts of the reduction and oxidation paramagnetic products of the γ-irradiation can be detected.

The neutron irradiation effects on the temperature dependencies of the electrical conductivity of nanosilicon particles

2017 ◽  
Vol 31 (28) ◽  
pp. 1750257 ◽  
Author(s):  
Elchin Huseynov ◽  
Aydan Garibli
Keyword(s):  
Electrical Conductivity ◽  
Neutron Flux ◽  
Neutron Irradiation ◽  
Silicon Nanoparticles ◽  
Activation Energies ◽  
Radiation Defects ◽  
Irradiation Effects ◽  
Active Radiation ◽  
Before And After ◽  
Effects Of Temperature

The effects of temperature and neutron irradiation on the silicon nanoparticles have been studied at different frequencies. It has been defined that additional electro-active radiation defects occur in the silicon nanomaterial after neutron irradiation. Therefore, the change of neutron flux at the interval of [Formula: see text]–[Formula: see text] increases the conductivity of nanosilicon. Activation energies of the silicon nanoparticles were calculated for 10 different constant frequencies according to Arrhenius approach before and after neutron irradiation. The mechanism of electrical conductivity which explains results has been established.

scholarly journals Influence of γ-Irradiation on the Structural Properties of Indium Monoselenide Crystals

2016 ◽  
Vol 6 (6) ◽  
pp. 1264-1268
Author(s):  
F. A. Al-Mufadi ◽  
A. El-Taher ◽  
G. A. Gamal
Keyword(s):  
Structural Properties ◽  
Energy Gap ◽  
Γ Irradiation ◽  
Layered Semiconductor ◽  
X Ray ◽  
Detailed Structural Analysis ◽  
Peak Broadening ◽  
Potential Applications ◽  
Vertical Bridgman ◽  
Special Modification

Indium monoselenide (InSe) which is a layered semiconductor whose energy gap is 1.24 eV has received attention because of its potential applications in optoelectronic devices. In the present work n-type InSe crystals were grown by a special modification of the vertical Bridgman technique. X-ray Diffraction (XRD) patterns showed that all samples were single phased InSe. The crystals were irradiated with 100 - 500 KGy to reveal the influence of irradiation on the structural properties of the samples. Detailed structural analysis was done by Scherrerr’s procedures, x-ray peak broadening and Williamson–Hall plot methods to evaluate the crystalline sizes and lattice strain. Also from the relations between the irradiation dose and the deformation of the lattice parameters we could investigate and discuss the mutation of the dislocation density, grain size, microstrain and crystallinity of the grown crystals. Striking results are found due to irradiation in the present study for the first time.

scholarly journals Studies on Synthesis and Structural Properties of Nickel Ferrite before and after Gamma Irradiation

2020 ◽  
Vol 1644 ◽  
pp. 012020
Author(s):  
Santosh Kalunge ◽  
Anand Surase ◽  
D. R. Sapate ◽  
S. R. Nimbhore ◽  
V. K. Barote ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Structural Properties ◽  
Nickel Ferrite ◽  
Before And After
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