Structural changes in nickel alloys subjected to gamma irradiation in a gaseous medium

1996 ◽  
Vol 39 (2) ◽  
pp. 168-174
Author(s):  
N. M. Zaitseva ◽  
L. Yu. Elizar'eva ◽  
V. A. Kulikov
Keyword(s):  
Gamma Irradiation ◽  
Nickel Alloys ◽  
Structural Changes ◽  
Gaseous Medium

EFFECT OF GAMMA IRRADIATION ON YBa2Cu3O7-δ HIGH TEMPERATURE SUPERCONDUCTORS

2008 ◽  
Vol 22 (27) ◽  
pp. 2699-2707 ◽  
Author(s):  
SAADAT A. SIDDIQI ◽  
RABIA SIDDIQUI ◽  
SALAMAT ALI
Keyword(s):  
Gamma Irradiation ◽  
Structural Changes ◽  
High Temperature Superconductors ◽  
Secondary Phase ◽  
Xrd Analysis ◽  
Theoretical Explanation ◽  
X Ray Diffraction ◽  
Lattice Constants ◽  
Xrd Patterns ◽  
Experimental Findings

Samples of YBa 2 Cu 3 O 7-δ superconducting ceramic were prepared and characterized by resistivity measurements using the four probe method and structural analysis using X-ray diffraction (XRD). XRD-patterns show the presence of orthorhombic Y -123 phase with a small fraction of secondary phase, YBa 2 Cu 3 O 5. Samples were irradiated with gamma (γ) rays using Co 60 source with five successive doses of 2.5 Mrad. A monotonic increase in the Tc0 value was observed for radiation dosage up to 10 Mrad. When exposed to even higher γ-doses, the Tc0 value leveled off at a saturation value or decreased. XRD-analysis shows slightly changed values of the lattice constants and a mild shift of diffraction peaks towards a lower 2θ value. These observations indicate structural changes in YBa 2 Cu 3 O 7-δ induced upon gamma irradiation. The present work describes our experimental findings and attempts to offer a theoretical explanation for the effects observed.

scholarly journals Special features of structural changes of amorphizing nickel alloys in liquid and heterogeneous state

2016 ◽  
Vol 133 ◽  
pp. 012032
Author(s):  
G B Tyagunov ◽  
E E Baryshev ◽  
K Yu Shmakova
Keyword(s):  
Nickel Alloys ◽  
Structural Changes

Mössbauer study of the dynamics of structural changes in nickel alloys under γ irradiation

1996 ◽  
Vol 39 (5) ◽  
pp. 485-491
Author(s):  
N. M. Zaitseva
Keyword(s):  
Nickel Alloys ◽  
Structural Changes ◽  
Mössbauer Study ◽  
Γ Irradiation

Structural changes in the Kh20N45M4B nickel alloys and the Kh16N15M3B steel due to helium ion bombardment

1985 ◽  
Vol 59 (2) ◽  
pp. 668-675
Author(s):  
B. A. Kalin ◽  
I. I. Chernov ◽  
V. L. Yakushin ◽  
G. N. Shishkin ◽  
V. N. Chernikov ◽  
...  
Keyword(s):  
Nickel Alloys ◽  
Structural Changes ◽  
Ion Bombardment ◽  
Helium Ion ◽  
Kh16n15m3b Steel

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

2016 ◽  
Vol 23 (6) ◽  
pp. 1424-1432 ◽  
Author(s):  
V. N. Rai ◽  
Parasmani Rajput ◽  
S. N. Jha ◽  
D. Bhattacharyya ◽  
B. N. Raja Shekhar ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Photoelectron Spectroscopy ◽  
Glass Matrix ◽  
Structural Changes ◽  
Phosphate Glasses ◽  
White Line ◽  
Edge Structure ◽  
Xps Spectra ◽  
X Ray ◽  
X Ray Absorption

X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) of Nd-doped phosphate glasses have been studied before and after gamma irradiation. The intensity and the location of the white line peak of theL3-edge XANES of Nd are found to be dependent on the ratio O/Nd in the glass matrix. Gamma irradiation changes the elemental concentration of atoms in the glass matrix, which affects the peak intensity of the white line due to changes in the covalence of the chemical bonds with Nd atoms in the glass (structural changes). Sharpening of the Nd 3d5/2peak profile in XPS spectra indicates a deficiency of oxygen in the glasses after gamma irradiation, which is supported by energy-dispersive X-ray spectroscopy measurements. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation has been found to be correlated to the concentration of defects in the glass samples, which are responsible for its radiation resistance as well as for its coloration.

Disparate structural changes in the titanium dioxide thin film coated on the p-type Si and porous silicon textures after gamma irradiation

2021 ◽  
Vol 267 ◽  
pp. 115089
Author(s):  
P. Pandaram ◽  
K.B. Jashi ◽  
A.V. Sathish ◽  
A. Saranya ◽  
S. Jothi ◽  
...  
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Porous Silicon ◽  
Gamma Irradiation ◽  
Structural Changes ◽  
P Type

scholarly journals Structural changes in melts of heat-resistant nickel alloys

2016 ◽  
Vol 16 (04) ◽  
pp. 16-22
Author(s):  
A.G. Tyagunov ◽  
Keyword(s):  
Nickel Alloys ◽  
Structural Changes ◽  
Heat Resistant

Structural changes of poly(ethylene isophthalate) subjected to gamma irradiation

2011 ◽  
Vol 96 (7) ◽  
pp. 1297-1300 ◽  
Author(s):  
G. Consolati ◽  
N. Lotti ◽  
M. Mariani ◽  
A. Munari ◽  
F. Quasso
Keyword(s):  
Gamma Irradiation ◽  
Structural Changes ◽  
Poly Ethylene

The structural changes in butyl and halogenated butyl elastomers during gamma irradiation

1996 ◽  
Vol 59 (6) ◽  
pp. 969-974 ◽  
Author(s):  
Traian Zaharescu ◽  
Cristian Postolache ◽  
Maria Giurginca
Keyword(s):  
Gamma Irradiation ◽  
Structural Changes

Nylon 6,12 fibers under low-dose gamma irradiation

2011 ◽  
Vol 31 (5) ◽  
Author(s):  
Carmina Menchaca-Campos ◽  
Gonzalo Martínez-Barrera ◽  
Alexander Fainleib
Keyword(s):  
Gamma Irradiation ◽  
Structural Changes ◽  
Low Dose ◽  
Mechanical Performance ◽  
Physicochemical Characterization ◽  
Fiber Surface ◽  
Polymer Modification ◽  
Fusion Temperature ◽  
Scanning Calorimetry ◽  
Fusion Enthalpy

Abstract One of the most important applications of gamma irradiation is in the area of polymer modification. Nylon fibers that were gamma-irradiated with a dose higher than 25 kGy show fusion temperature and fusion enthalpy higher than the nonirradiated nylon. Nevertheless, under certain applications, the influence of nylon-irradiated fibers is noticeable below 50 kGy; therefore, physicochemical characterization is indispensable. In the present work, nylon 6,12 crystalline fibers were irradiated at low dose (from 1 to 25 kGy) at environmental conditions to confirm the thermal behavior. The melting point and fusion enthalpy were measured with differential scanning calorimetry; structural changes were studied using infrared spectroscopy; and fiber surface morphology was studied using atomic force microscopy. The results show an increase in both fusion temperature and fusion enthalpy, which are effects of the newly ordered high-molecular-weight oligo­mers. Recrystallization and oligomer formation can be observed in infrared spectra. Such behaviors are directly related to the partial damage over the surface and the mechanical performance of manufactured composites.

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