Kurt E. Sickafus
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View article: An idealized model for the crystal structure of intermetallic compounds isostructural with Mg <sub>3</sub> Cr <sub>2</sub> Al <sub>18</sub>
An idealized model for the crystal structure of intermetallic compounds isostructural with Mg <sub>3</sub> Cr <sub>2</sub> Al <sub>18</sub> Open
Mg3Cr2Al18 (abbreviated in this report as MCA) is the parent phase for a large class of intermetallic compounds that belong to the cubic crystal space group, $Fd\overline{3}m$. The purpose of this paper is to introduce an ideal, unrelaxed …
View article: Fundamentals of Ruddlesden-Popper (R-P) Phases: Based on the Perovskite Crystal Structure [Slides]
Fundamentals of Ruddlesden-Popper (R-P) Phases: Based on the Perovskite Crystal Structure [Slides] Open
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View article: High entropy ceramics for applications in extreme environments
High entropy ceramics for applications in extreme environments Open
Compositionally complex materials have demonstrated extraordinary promise for structural robustness in extreme environments. Of these, the most commonly thought of are high entropy alloys, where chemical complexity grants uncommon combinat…
View article: Irradiation study of PNNL synthesized glass-ceramics
Irradiation study of PNNL synthesized glass-ceramics Open
Two types of glass-ceramic were investigated: (1) for immobilization of Ln, alkali, and alkaline earths (GC4); and (2) same as above + high (7%) molybdenum content (Mo7) multiphase specimens. The purpose was to study the radiation stabilit…
View article: ION BEAM SYNTHESIS OF BURIED OXIDE LAYERS IN SILICON CARBIDE
ION BEAM SYNTHESIS OF BURIED OXIDE LAYERS IN SILICON CARBIDE Open
A field emission gun scanning transmission electron microscope equipped with an energy-dispersive X-ray spectrometer (EDX) and an electron energy loss spectrometer (EELS) has been used to characterize the microstructures, elemental distrib…
View article: High dose Xe ion irradiation of yttria stabilized zirconia : influence of sputtering on implanted ion profile and retained damage /.
High dose Xe ion irradiation of yttria stabilized zirconia : influence of sputtering on implanted ion profile and retained damage /. Open
Fully-stabilized zirconia is known as a radiation resistant material. The objective of many experinients on zirconia has been to test the susceptibility of this material to amorphization. Because zirconia exhibits high radiation tolerance,…
View article: Point-detect production and migration in plutonium metal at ambient conditions
Point-detect production and migration in plutonium metal at ambient conditions Open
Modeling thermodynamics and defect production in plutonium (Pu) metal and its alloys, has proven to be singularly difficult. The multiplicity of phases and the small changes in temperature, pressure, and/or stress that can induce phase cha…
View article: OPTIMIZATION OF CERAMICS FOR NUCLEAR FUEL AND WASTE FORM APPLICATIONS
OPTIMIZATION OF CERAMICS FOR NUCLEAR FUEL AND WASTE FORM APPLICATIONS Open
We have used atomistic computer simulations and ion beam irradiations to examine radiation damage accumulation in oxides and nitrides. We have developed contour energy maps for oxides via computer simulations, to predict the effects of str…
View article: Predicting the radiation tolerance of oxides
Predicting the radiation tolerance of oxides Open
We have used atomistic computer simulations and ion beam irradiations to examine radiation damage accumulation in multicomponent oxides, We have developed contour energy maps via computer simulations to predict the effects of oxide structu…
View article: Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12
Irradiation-induced amorphization and order-disorder transformation in the tungsten delta-phase oxides Yb6W1O12 and Y6W1O12 Open
Polycrystalline Yb{sub 6}W{sub 1}O{sub 12} and Y{sub 6}W{sub 1}O{sub 12} samples, which possess rhombohedral symmetry (structure known as the {delta}-phase, closely related to cubic fluorite structure), were irradiated with 280 keV Kr{sup …
View article: First-principles prediction of disordering tendencies in complex oxides
First-principles prediction of disordering tendencies in complex oxides Open
The disordering tendencies of a series of zirconate (A{sub 2}Zr{sub 2}O{sub 7}) , hafnate (A{sub 2}Hf{sub 2}O{sub 7}), titanate (A{sub 2}Ti{sub 2}O{sub 7}), and stannate (A{sub 2} Sn{sub 2}O{sub 7}) pyrochlores are predicted in this study …
View article: High entropy ceramics for applications in extreme environments
High entropy ceramics for applications in extreme environments Open
Compositionally complex materials have demonstrated extraordinary promise for structural robustness in extreme environments. Of these, the most commonly thought of are high entropy alloys, where chemical complexity grants uncommon combinat…
View article: Insights into defect kinetics, mass transport, and electronic structure from spectrum effects in ion-irradiated Bi<sub>2</sub>O<sub>3</sub>
Insights into defect kinetics, mass transport, and electronic structure from spectrum effects in ion-irradiated Bi<sub>2</sub>O<sub>3</sub> Open
Ion-irradiation of α-Bi 2 O 3 induces amorphization, altering mass transport and band structure.
View article: Energetic Particle-Solid Interactions: Energy Partitioning and Radiation Effects [Slides]
Energetic Particle-Solid Interactions: Energy Partitioning and Radiation Effects [Slides] Open
astrophysical nuclear reaction rate data. The Thermonuclear Data File (TDF) system developed at the Lawrence Livermore National Laboratory (Warshaw 1991), which is the topic of this report, contains data on the Maxwellian-averaged thermonu…
View article: Stability of radiation-induced bixbyite phase in δ-Sc4Hf3O12
Stability of radiation-induced bixbyite phase in δ-Sc4Hf3O12 Open
International audience
View article: An Optical Transform of a Double Helix [Slides]
An Optical Transform of a Double Helix [Slides] Open
Rate constants for recombination were near 10/sup 5/ s/sup -1/ M/sup -1/ inthe temperature range from 32 to 47/sup 0/C; for the dissociation process, the rate constants varied from 1 s/sup -1/ near 32/sup 0/C to 130 s/sup -1/ near 47/sup 0…
View article: An Introduction to Radiation Damage in Minerals and Ceramics [Slides]
An Introduction to Radiation Damage in Minerals and Ceramics [Slides] Open
Radiation effects in minerals and ceramics are quite distinct from effects observed in metals. This is largely due to interactions between radiation and the electronic structure of insulating materials that are unique compared to metallic …
View article: What is Retrogradation? [Slides]
What is Retrogradation? [Slides] Open
Glucose is a monomer building block for complex polymers. Starch is made by covalently bonding together a chain of glucose monomers.Starch absorbs water and forms an amorphous gel upon heating – amorphous starch granules are an important c…