scholarly journals High Energy Polarized Deuterons at the Argonne National Laboratory Zero Gradient Synchrotron

1979 ◽  
Vol 26 (3) ◽  
pp. 3200-3202 ◽  
Author(s):  
Everette F. Parker ◽  
Fred E. Brandeberry ◽  
Edwin A. Crosbie ◽  
Martin J. Knott ◽  
Charles W. Potts ◽  
...  
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
High Energy ◽  
Polarized Deuterons

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.

Influence of Stacking Faults and Alloy Composition on Irradiation Induced Amorphization of Zrcr2, Zrfe2 And Zr3(Fei. X,Nix)

1995 ◽  
Vol 398 ◽  
Author(s):  
Joseph A. Faldowski ◽  
Arthur T. Motta ◽  
Lawrence M. Howe ◽  
Paul R. Okamoto
Keyword(s):  
Alloy Composition ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Stacking Faults ◽  
High Energy ◽  
Critical Temperatures ◽  
Damage Level ◽  
High Energy Electrons ◽  
Defect Accumulation ◽  
Lindemann Criterion

ABSTRACTThe Zr-based intermetallic compounds ZrCr2, ZrFe2 and Zr3(Fei_x,Nix) were irradiated with high energy electrons at the HVEM/Tandem facility at Argonne National Laboratory to study their amorphization behavior. The results show that although ZrCr2 and ZrFe2 have the same Laves phase C15 fee crystal structure, their critical temperatures for amorphization under electron irradiation were 180 K and 80 K, showing that the substitution of Cr for Fe in the sublattice had a marked effect on the annealing characteristics of the material. The low temperature dose to amorphization was higher in ZrFe2 than in ZrCr2 by a factor of two. The presence of a high density of stacking faults had a strong effect on amorphization in both compounds causing the critical temperature to be increased by 10–15 K. By contrast, the addition of Ni to Zr3(Fei_x,Nix) had no effect on amorphization behavior for x=0. 1 and 0. 5. These results are discussed in terms of current models of amorphization based on defect accumulation and the attainment of a critical damage level, such as given by the Lindemann criterion.

Design and operation of a superconducting high energy beam line at the Argonne National Laboratory zero gradient synchrotron

1977 ◽  
Vol 13 (1) ◽  
pp. 294-296 ◽  
Author(s):  
J. Bywater ◽  
C. Brzegowy ◽  
J. Dvorak ◽  
R. Fuja ◽  
H. Ludwig ◽  
...  
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
High Energy ◽  
Beam Line ◽  
Energy Beam ◽  
High Energy Beam

Radiation-induced disordering and amorphization—An in situ HVEM study of uranium silicide with comparison to natural processes in zirconolite

1990 ◽  
Vol 48 (4) ◽  
pp. 534-535
Author(s):  
R. C. Birtcher ◽  
L. M. Wang ◽  
C. W. Allen ◽  
R. C. Ewing
Keyword(s):  
Electron Irradiation ◽  
Ion Irradiation ◽  
Ion Beam ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Heavy Ion ◽  
High Energy ◽  
In Situ Tem ◽  
In Situ Experiments

We present here results of in situ TEM diffraction observations of the response of U3Si and U3Si2 when subjected to 1 MeV electron irradiation or to 1.5 MeV Kr ion irradiation, and observations of damage occuring in natural zirconolite. High energy electron irradiation or energetic heavy ion irradiation were performed in situ at the HVEM-Tandem User Facility at Argonne National Laboratory. In this Facility, a 2 MV Tandem ion accelerator and a 0.6 MV ion implanter have been interfaced to a 1.2 MeV AEI high voltage electron microscope. This allows a wide variety of in situ experiments to be performed with simultaneous ion irradiation and conventional transmission electron microscopy. During the electron irradiation, the electron beam was focused to a diameter of about 2 μ.m at the specimen thin area. The ion beam was approximately 2 mm in diameter and was uniform over the entire specimen. With the specimen mounted in a heating holder, the temperature increase indicated by the furnace thermocouple during the ion irradiation was typically 8 °K.

scholarly journals Novel silica stabilization method for the analysis of fine nanocrystals using coherent X-ray diffraction imaging

2016 ◽  
Vol 23 (4) ◽  
pp. 953-958 ◽  
Author(s):  
Marianne Monteforte ◽  
Ana K. Estandarte ◽  
Bo Chen ◽  
Ross Harder ◽  
Michael H. Huang ◽  
...  
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
Three Dimensional ◽  
High Energy ◽  
Silica Matrix ◽  
Stabilization Method ◽  
X Ray ◽  
Novel Device ◽  
Powerful Analytical Tool ◽  
Diffraction Imaging

High-energy X-ray Bragg coherent diffraction imaging (BCDI) is a well established synchrotron-based technique used to quantitatively reconstruct the three-dimensional morphology and strain distribution in nanocrystals. The BCDI technique has become a powerful analytical tool for quantitative investigations of nanocrystals, nanotubes, nanorods and more recently biological systems. BCDI has however typically failed for fine nanocrystals in sub-100 nm size regimes – a size routinely achievable by chemical synthesis – despite the spatial resolution of the BCDI technique being 20–30 nm. The limitations of this technique arise from the movement of nanocrystals under illumination by the highly coherent beam, which prevents full diffraction data sets from being acquired. A solution is provided here to overcome this problem and extend the size limit of the BCDI technique, through the design of a novel stabilization method by embedding the fine nanocrystals into a silica matrix. Chemically synthesized FePt nanocrystals of maximum dimension 20 nm and AuPd nanocrystals in the size range 60–65 nm were investigated with BCDI measurement at beamline 34-ID-C of the APS, Argonne National Laboratory. Novel experimental methodologies to elucidate the presence of strain in fine nanocrystals are a necessary pre-requisite in order to better understand strain profiles in engineered nanocrystals for novel device development.

Time-resolved studies of the order–disorder phase transformations in rare-earth–transition metal intermetallics with 2-17 stoichiometry

2008 ◽  
Vol 23 (11) ◽  
pp. 2886-2896 ◽  
Author(s):  
Y.Y. Kostogorova-Beller ◽  
M.J. Kramer ◽  
J.E. Shield
Keyword(s):  
Rare Earth ◽  
Phase Transformations ◽  
Rietveld Method ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
High Energy ◽  
Lattice Parameters ◽  
X Rays ◽  
Time Resolved ◽  
Alloying Additions

High-temperature order–disorder transformations in R2T17 and R2T17-M-C intermetallics with R = Pr, Sm, Dy, Tb; T = Co, Fe; and M = Zr, Nb were studied utilizing time-resolved synchrotron x-ray diffraction at the Advanced Photon Source (APS) at the U.S. Department of Energy’s Argonne National Laboratory (Argonne, IL). High-energy synchrotron radiation provides intense, highly penetrating x-rays, which are ideal for in situ studies of phase transformations. Alloying additions are used to stabilize formation of metastable phases; their influence on order recovery was investigated. The experimental setup utilized Debye–Scherrer geometry; specimens were heated at a rate of 10 K/min. Full-profile diffraction patterns collected every 10 s were refined in sequence using the Rietveld method to track changes of lattice parameters and phase assemblages during heating. Sharp changes observed in the evolution of temperature-dependent lattice parameters suggested formation of ordered structure via nucleation and growth. Both 2-17 polymorphs co-existed in light and heavy rare-earth systems at high temperatures. The presence of alloying additions in the solid solution greatly influenced long-range order formation.

Thermal Expansion of Ti5Si3 with Ge, B, C, N, or O Additions

2000 ◽  
Vol 15 (8) ◽  
pp. 1780-1785 ◽  
Author(s):  
J. J. Williams ◽  
M. J. Kramer ◽  
M. Akinc
Keyword(s):  
Thermal Expansion ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
High Energy ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
Cornell University ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Photon Source

The crystallographic thermal expansion coefficients of Ti5Si3 from 20 to 1000 °C as a function of B, C, N, O, or Ge content were measured by high-temperature x-ray diffraction using synchrotron sources at Cornell University (Cornell High Energy Synchrotron Source; CHESS) and Argonne National Laboratory (Advanced Photon Source; APS). Whereas the ratio of the thermal expansion coefficients along the c and a axes was approximately 3 for pure Ti5Si3, this ratio decreased to about 2 when B, C, or N atoms were added. Additions of O and Ge were less efficient at reducing this thermal expansion anisotropy. The extent by which the thermal expansion was changed when B, C, N, or O atoms were added to Ti5Si3 correlated with their expected effect on bonding in Ti5Si3.

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