Los Alamos National Laboratory
Materials Science in Radiation and Dynamics Extremes (MST-8)

Dislocations in complex oxide

Radiation Science, Nuclear Materials and Fuels Experimental Team

A common theme of the Radiation Science, Nuclear Materials, and Fuels Experimental Team is the synthesis of primarily oxide ceramics that are often irradiated and the effects of the radiation characterized by a variety of techniques on length scales from atomic to bulk. Many of these materials are based on or include actinides or are otherwise associated with possible nuclear energy applications and fundamental scientific properties related to nuclear energy and nuclear materials. Additional projects on stress measurements, actinide environmental and forensics chemistry, plutonium and uranium metallurgy, correlated materials, etc., enhance the scientific breadth and capabilities of this team.

Capabilities

  • Structure analysis by synchrotron x-ray absorption and scattering measurements including microfocus and electronic structure applications on a wide variety of radioactive samples
  • Neutron diffraction measurements on a wide variety of polycrystalline materials, which include, but are not limited to radioactive and hazardous materials at temperatures up to 1000°C
  • Produce extreme radiation environments through ion bombardment on samples from cryogenic temperatures through 1200°C; modify material properties through ion implantation; and analyze material compositions with ion scattering, X-ray emission, and nuclear reaction techniques
  • Synthesis and thermophysical characterization of oxides, nitrides and low level radioactive materials for thermal conductivity and thermal expansion measurements and the detection of phase changes associated with varying composition and stoichiometry
  • Single crystal growth
  • Synthesis of ceramic and glass waste forms, and characterization by TEM, SEM, XRD, and Nano-indentation, Ion beam irradiation
  • A variety of electron microscopy techniques, especially ones for identifying and characterizing defect structures on multiple length scales

Projects

  • The determination of atomic and electronic structure and chemical speciation in complex actinide-containing materials for environmental, weapons, forensics, energy, and fundamental science application
  • Calculating the response of crystalline materials on the grain/microstructure level to stress, temperature, and magnetic fields for weapons, energy, and fundamental science applications.
  • Characterize the modifications and mechanisms of ion beam radiation on the the microstructure of materials, especially complex oxides, for energy, defence, space, and fundamental nanoscience applications.
  • Growth and thermophysical analysis of single crystals of uranium oxides in support of the Fuel Cycle R&D program.
  • Development of systems, techniques, and fabrication methods to characterized and produce specimens and data used to develop and validate materials used in nuclear fuel applications.
  • Explore silicate-based glass ceramics and titanate ceramics as alternatives to glass for nuclear waste form materials.

Steve Conradson, Team Leader

  • Osman Anderoglu
  • Don Brown
  • Darrin Byler
  • Anna Kossoy-Simakov
  • Mary Martucci
  • Will McAlexander
  • Ken McClellan
  • Paula Mosbrucker
  • Maulik Patel
  • Magdalena Serrano de Caro
  • Thomas Sisneros
  • Tiberiu Stan
  • Ming Tang
  • James Valdez
  • Yongqiang Wang
  • Jongham Won
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