High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi2Sr2CaCu2Ox by Swift Heavy Ion Irradiation

2003 ◽  
Vol 792 ◽  
Author(s):  
F. Kano ◽  
M. Terasawa ◽  
T. Mitamura ◽  
T. Kambara ◽  
Y. Sasaki ◽  
...  
Keyword(s):  
High Resolution ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Electron Gun ◽  
Spectrochemical Analysis ◽  
Columnar Defect ◽  
Defect Center ◽  
X Ray ◽  
Columnar Defects

ABSTRACTSingle-crystal specimen of high-temperature superconductor Bi2Sr2CaCu2Ox was irradiated with 3.5 GeV Xe ions at room temperature up to 1.0 × 1011 ion/cm2. Significant enhancement of magnetization by the irradiation was confirmed. The irradiated specimens were studied by using a high-resolution transmission electron microscope with field emission electron gun (FE-TEM), and, also, with an energy dispersive x-ray analyzer (EDS). Columnar defects with diameter of about 6 nm were observed along the incident ion tracks. By nanoscale high-resolution x-ray spectrochemical analysis across the columnar defect, enrichment of Cu and depletion of Bi, Sr and Ca in the columnar defect center, and vice versa in the outskirts of the defect, was found for the first time. Oxygen depletion in the defect, and increased distribution outside of the defect were also found by electron energy loss spectroscopy. This experimental evidence suggests that the columnar defects are formed as a consequence of Coulomb explosion induced by the electronic excitation of the high-energy heavy ions.

scholarly journals Measurement of Oxygen Disorder and Nano-Twin Microstructure Associated with Columnar Defects In Ybco

1998 ◽  
Vol 540 ◽  
Author(s):  
Y. Yan ◽  
T. Walther ◽  
M.A. Kirk
Keyword(s):  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
High Dose ◽  
Twin Boundaries ◽  
High Tc ◽  
Heavy Ion Irradiation ◽  
Transmission Electron ◽  
Columnar Defects ◽  
Lattice Images

AbstractStudies of defects generated by high energy (>1 GeV) heavy ion irradiation in high-Tc superconductors have been performed by transmission electron microscopy (TEM). Our study shows that high dose irradiation leads to the formation of nano-twins, by which the columnar defects are connected. An analysis of the local Fourier components of the image intensity in [001] lattice images indicates that these new "twin" boundaries are much more diffuse than preexisting twin boundaries in YBCO. The mechanism of the formation of nano-twin boundaries on {110} planes and their possible relation to superconducting properties are discussed.

Electron and ion irradiation-induced dissolution of mechanical twins in the intermetalic U3Si: An in situ HVEM study

1989 ◽  
Vol 47 ◽  
pp. 652-653
Author(s):  
Charles W. Allen ◽  
Robert C. Birtcher
Keyword(s):  
Elevated Temperatures ◽  
Ion Irradiation ◽  
Ion Beam ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Heavy Ion ◽  
High Energy ◽  
Mechanical Twinning ◽  
In Situ Experiments

The uranium silicides, including U3Si, are under study as candidate low enrichment nuclear fuels. Ion beam simulations of the in-reactor behavior of such materials are performed because a similar damage structure can be produced in hours by energetic heavy ions which requires years in actual reactor tests. This contribution treats one aspect of the microstructural behavior of U3Si under high energy electron irradiation and low dose energetic heavy ion irradiation and is based on in situ experiments, performed at the HVEM-Tandem User Facility at Argonne National Laboratory. This Facility interfaces a 2 MV Tandem ion accelerator and a 0.6 MV ion implanter to a 1.2 MeV AEI high voltage electron microscope, which allows a wide variety of in situ ion beam experiments to be performed with simultaneous irradiation and electron microscopy or diffraction.At elevated temperatures, U3Si exhibits the ordered AuCu3 structure. On cooling below 1058 K, the intermetallic transforms, evidently martensitically, to a body-centered tetragonal structure (alternatively, the structure may be described as face-centered tetragonal, which would be fcc except for a 1 pet tetragonal distortion). Mechanical twinning accompanies the transformation; however, diferences between electron diffraction patterns from twinned and non-twinned martensite plates could not be distinguished.

Uranium–molybdenum nuclear fuel plates behaviour under heavy ion irradiation: An X-ray diffraction analysis

2009 ◽  
Vol 385 (2) ◽  
pp. 449-455 ◽  
Author(s):  
H. Palancher ◽  
N. Wieschalla ◽  
P. Martin ◽  
R. Tucoulou ◽  
C. Sabathier ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Nuclear Fuel ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heavy Ion Irradiation

Modification of Barium Cerate by Heavy Ion Irradiation

2013 ◽  
Vol 781-784 ◽  
pp. 357-361 ◽  
Author(s):  
Igor V. Khromushin ◽  
Taтiana I. Aksenova ◽  
Turgora Tuseyev ◽  
Karlygash K. Munasbaeva ◽  
Yuri V. Ermolaev ◽  
...  
Keyword(s):  
Structural Changes ◽  
Solid Phase ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Low Energy ◽  
Barium Cerate ◽  
Weakly Bound ◽  
Ion Ranges ◽  
High Energy Ions

The effect of irradiation with heavy ions Ne, Ar, and Kr of various energies on the structure and properties of ceramic barium cerate doped with neodymium and annealed in air at 650°C for 7 hours is studied. It is noted that blistering was observed on cerate surface during its irradiation by low energy Ne ions, whereas it was not observed under low-energy Ar and Kr ions irradiation. Irradiation of the cerate with high energy ions caused partial amorphization of the irradiated surface of the material, while the structure of the non-irradiated surface did not change. In addition, the irradiated surface of the cerate endured solid-phase structural changes. Thus, upon high-energy ions irradiation in the range of Ne, Ar, Kr the cerate surface resembled the stages of spherulite formation - nucleation, growth (view of cauliflower), formation of spherulitic crust, respectively. The increase in water molecules release and reduction of molecular oxygen release from the barium cerate, irradiated by high-energy ions is found during vacuum constant rate heating. It is concluded that cerates undergo changes to the distances significantly exceeding the ion ranges in these materials. Features of high-energy ions influence on thermal desorption of carbon dioxide from cerates show, apparently, the formation of weakly bound carbonate compounds on the cerate surface in the irradiation process.

Surface modification by high-energy heavy-ion irradiation in various crystalline ZnO facets

2021 ◽  
Vol 23 (39) ◽  
pp. 22673-22684
Author(s):  
Adéla Jagerová ◽  
Romana Mikšová ◽  
Oleksander Romanenko ◽  
Iva Plutnarova ◽  
Zdeněk Sofer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Modification ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Irradiation ◽  
Surface Nanostructures ◽  
The Creation

The high-energy ion irradiation induces the creation of ZnO surface nanostructures affecting optical properties, which may be promising for photocatalysis and optoelectronics.

scholarly journals Interaction between Al and atomic layer deposited (ALD) ZrN under high-energy heavy ion irradiation

2019 ◽  
Vol 164 ◽  
pp. 788-798 ◽  
Author(s):  
Sumit Bhattacharya ◽  
Xiang Liu ◽  
Yinbin Miao ◽  
Kun Mo ◽  
Zhi-Gang Mei ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Atomic Layer ◽  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Irradiation

Preparation and Modification of Magnetite Thin Films by Swift Kr-Ion Irradiation

2010 ◽  
Vol 160-162 ◽  
pp. 1012-1015
Author(s):  
Jian Rong Sun ◽  
Zhi Guang Wang ◽  
Yu Yu Wang ◽  
Kong Fang Wei ◽  
Tie Long Shen ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Irradiation ◽  
Magnetic Moments ◽  
Heavy Ion ◽  
Crystallographic Structure ◽  
Swift Heavy Ion ◽  
Columnar Defects ◽  
Magnetite Fe3o4 ◽  
Shi Irradiation ◽  
Fe3o4 Thin Film

Polycrystalline magnetite (Fe3O4) thin films is synthesized at low temperature (90 oC) by electroless plating in aqueous solution, and the behavior of the magnetic property of the Fe3O4 thin film irradiated by Kr26+ ions at energy of 2.03 GeV is investigated by magnetization measurements. The initial crystallographic structure of the Fe3O4 remains unaffected after swift heavy ion (SHI) irradiation, but both coercive force and saturation magnetization are sensitive to Kr26+ ion irradiation and exhibit different behaviors depending on the ion fluence range. And SHI irradiation could make the magnetic moments of the Fe3O4 films ordered around the columnar defects and the magnetic moments tend to arrange along the films plane. All modifications of the magnetic properties could be interpreted very well by the effects related to the stress and defects induced by SHI irradiation.

High-resolution x-ray studies of an AXAF high-energy transmission grating

1994 ◽  
Author(s):  
Salim Abdali ◽  
Finn E. Christensen ◽  
Herbert W. Schnopper ◽  
Thomas H. Markert ◽  
Daniel Dewey ◽  
...  
Keyword(s):  
High Resolution ◽  
High Energy ◽  
Energy Transmission ◽  
X Ray ◽  
Transmission Grating

scholarly journals Heavy-Ion Irradiation Induced Diamond Formation in Carbonaceous Materials

1998 ◽  
Vol 540 ◽  
Author(s):  
T. L. Daulton ◽  
R. S. Lewis ◽  
L. E. Rehn ◽  
M. A. Kirk
Keyword(s):  
Ambient Temperature ◽  
Ion Irradiation ◽  
Metastable Phase ◽  
Radioactive Decay ◽  
Heavy Ion ◽  
High Energy ◽  
High Energy Particle ◽  
Acid Dissolution ◽  
Heavy Ion Irradiation ◽  
Particle Tracks

AbstractMetastable phase formation under highly non-equilibrium thermodynamic conditions within high-energy particle tracks are investigated. In particular, the possible formation of diamond by heavy-ion irradiation of graphite at ambient temperature is examined. This work was motivated, in part, by an earlier study which discovered nanometer-grain polycrystalline diamond aggregates of submicron-size in uranium-rich carbonaceous mineral assemblages of Precambrian age. It was proposed that these diamonds were formed within the particle tracks produced in the carbonaceous minerals by the radioactive decay of uranium. To test the hypothesis that nanodiamonds can form by ion irradiation, fine-grain polycrystalline graphite sheets were irradiated with 400 MeV Kr ions to low fluence (6 × 1012 ions-cm−2). The ion-irradiated (and unirradiated control) graphite were then subjected to acid dissolution treatments to remove the graphite and isolate any diamonds that were produced. These acid residues were characterized by transmission electron microscopy. The acid residue of the ion-irradiated graphite was found to contain nanodiamonds (at several ppm of bulk), demonstrating that ion irradiation of graphite at ambient temperature can produce diamond.

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