DOE Information Exchanges Held in New Mexico
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Sandia National Laboratory
L. Smith, chairman of the Los Alamos Center for Materials Science, chairs the information exchange.
Los Alamos National Laboratory
The LANL meeting was opened by laboratory director Sig Hecker, who set the stage for a day and a half of technical presentations concerning BES-supported research at Los Alamos. Organizing the meeting and chairing the first day's session was James L. Smith, chairman of LANL's Center for Materials Science. A wide variety of topics were covered. Leading off was Zachary Fisk, who discussed correlated electrons and high Tc superconductivity. He described work on both heavy fermion systems and the new ceramic oxide superconductors.
Los Alamos director S. Hecker opens the information exchange.
Subsequent presentations dealt with localized vibrational modes (soliton-like) which can be sustained in solids showing both dispersion and nonlinear effects. Thermal physics and quantum fluids were described and a novel acoustic dilution refrigerator concept was demonstrated. Studies designed to elucidate the structure of molecular solids were also discussed. Several presentations concerned the Los Alamos neutron scattering facility (LANSCE). The accelerator is currently undergoing conditioning and is achieving
over 3X1013 protons per pulse. Applications of the neutron source were described, including the use of small angle neutron scattering to characterize colloidal materials and to observe the dynamic properties of biological molecules. Additional reports focused on prospects for neutron powder diffraction and results on neutron diffraction in neptunium deuterides. Thrusts in the areas of microwave sintering of ceramics, synthesis of conducting polymers and block co-polymers, and the theoretical modeling and synthesis of super-strong liquid crystalline polymers were identified. Very large strain deformation of metallic alloys is being studied experimentally and theoretically. Effects of microstructure, texture, and so-called Stage IV work h a r d e n i n g are being included in a computer model. Los Alamos plans to make this computer code available to the public. Approaches to the formation of amorphous metallic alloys are being studied at Los Alamos. One in particular is the mechanical alloying of metals, which results in a bulk amorphous material. Efforts to synthesize new high Tc rare earth/alkaline earth/copper oxide superconductors using mechanical alloying were described. Studies on structural ceramics are investigating atomic level interfaces on reinforcing fibers such as silicon carbide whiskers. The effects of radiation on intermetallic compounds and mixed oxides are being studied as well. James L. Smith concluded LANL's information exchange by summarizing LANL's work to date on high Tc superconductors. Los Alamos is part of a three-laboratory superconductor research team including Lawrence Berkeley Laboratory and Oak Ridge National Laboratory. The Division of Materials Sciences formed the team to coordinate high Tc research. [A second team of laboratories i
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