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ORNL study advances quest for better superconducting materials

Posted at 11:36 pm January 28, 2014
By Oak Ridge National Laboratory Leave a Comment

Superconductivity Pan Defects

Minghu Pan’s image of “clover-like” atomic defects—an example is circled—that result in strong superconductivity. (Photo courtesy ORNL)

Nearly 30 years after the discovery of high-temperature superconductivity, many questions remain, but an Oak Ridge National Laboratory team is providing insight that could lead to better superconductors.

Their work, published in Physical Review Letters, examines the role of chemical dopants, which are essential to creating high-temperature superconductors—materials that conduct electricity without resistance. The role of dopants in superconductors is particularly mysterious as they introduce non-uniformity and disorder into the crystal structure, which increases resistivity in non-superconducting materials.

By gaining a better understanding of how and why chemical dopants alter the behavior of the original (parent) material, scientists believe they can design superconductors that work at higher temperatures. This would make them more practical for real-world wire applications because it would lessen the extreme cooling required for conventional superconducting material. Existing “high-temperature superconductors” operate at temperatures in the range of negative 135 degrees Celsius and below. [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Science, U.S. Department of Energy Tagged With: Athena Safa-Sefat, atomic defect, Bayrammurad Saparov, chemical dopants, Claudia Cantoni, crystal, DOE, DOE Information Center, dopants, high-temperature superconductivity, high-temperature superconductors, Jonathan Mitchell, Krzysztof Gofryk, Local inhomogeneity and filamentary superconductivity in Pr-doped CaFe2As2, Materials Science and Technology Division, Minghu Pan, Oak Ridge National Laboratory, ORNL, Physical Review Letters, superconductors, U.S. Department of Energy

Y-12 neutron detector wins R&D 100 Award

Posted at 11:49 pm July 14, 2013
By Y-12 National Security Complex Leave a Comment

Y-12 Neutron Detector

Ashley Stowe, Y‑12 senior development chemist, working with Fisk University, developed a single-crystalline device that will be used in handheld nuclear nonproliferation and homeland security applications. (Submitted photo)

A Y-12 nuclear nonproliferation technology offering significant possibilities in the homeland security field was among those listed on the R&D Magazine 51st Annual R&D 100 Awards. The honor salutes the 100 most technologically significant products introduced into the marketplace during the past year.

The LISeTM, a high-efficiency thermal neutron detector based on the 6LiInSe2 crystal, is the first large, single-crystal semiconductor of high resistivity that contains lithium and directly detects thermal neutrons with high efficiency. The single-crystalline device will be used in handheld nuclear nonproliferation and homeland security applications to find fissile materials. Its simpler, more compact design, and higher efficiency are key improvements that will appeal to users. [Read more…]

Filed Under: National Nuclear Security Administration, Top Stories, U.S. Department of Energy, Y-12 National Security Complex Tagged With: 3He, 6LiInSe2, Arnold Burger, Ashley Stowe, B&W Y-12, Chuck Spencer, crystal, engineers, Ernest Moniz, Fisk University, homeland security, LISeTM, lithium, National Nuclear Security Administration, nuclear nonproliferation, R&D 100, R&D 100 Awards, R&D Magazine, scientists, thermal neutron detector, thermal neutrons, Y-12 National Security Complex, Zane Bell

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Classifieds

Public Notice: NNSA announces no significant impact of Y-12 Development Organization operations at Horizon Center

AVAILABILITY OF THE FINAL ENVIRONMENTAL ASSESSMENT FOR THE OFFSITE HOUSING OF THE Y-12 DEVELOPMENT … [Read More...]

ADFAC seeks contractors for five homes

Aid to Distressed Families of Appalachian Counties (ADFAC) is a non-profit community based agency, … [Read More...]

Public notice: Draft environmental assessment for Y-12 Development Organization at Horizon Center

AVAILABILITY OF THE DRAFT ENVIRONMENTAL ASSESSMENT FOR THE OFFSITE HOUSING OF THE Y-12 DEVELOPMENT … [Read More...]

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