Phonon localization drives nanoregions in a relaxor ferroelectric
April 11, 2014 — Neutron scattering measurements reveal that phonon localization drives the generation of polar nanoregions (PNRs) in a relaxor ferroelectric. PNRs facilitate the ability of relaxor ferroelectrics to convert between electrical and mechanical forms of energy, which is used in applications ranging from medical ultrasound to military sonar devices.
Decoding the Resistivity of Solid Electrolytes for Batteries
April 02, 2014 — The atomic-scale origin of grain-boundary (GB) resistance in solid electrolytes has been revealed by electron microscopy and spectroscopy. Inorganic solid electrolytes have the potential for enabling intrinsically safe, energy-dense batteries.
Neutron Sciences Staff Give Back, Teach US Particle Accelerator School Courses
March 13, 2014 — About 50 students from around the world toured the Spallation Neutron Source accelerator tunnel at Oak Ridge National Laboratory as part of United States Particle Accelerator School last month.
New Composite Electrolyte for Advanced Solid State Batteries Shows that Two is Better than One
February 26, 2014 — A new composite electrolyte for batteries with high conduction has been made by combining two solid electrolytes with complementary properties. The composite optimizes the favorable properties of the individual components while minimizing their limitations and opens the door for the development of new solid-state batteries for energy-dense storage of electricity.
Using neutrons to probe and understand battery interfaces
February 14, 2014 — Neutron reflectometry at the Spallation Neutron Source has revealed the composition and growth characteristics of the spontaneous chemical reaction layer formed between a silicon battery anode and an organic electrolyte that ultimately limits the capacity of the battery. We determined that a 3.
Anomalous Photodeposition of Ag on Ferroelectric Surfaces with Below Bandgap Excitation
February 14, 2014 — Photochemical deposition of elemental Ag nanoparticles on a ferroelectric substrate with sub bandgap transmitted white light indicates light confinement and non-linear optical phenomena. This innovation opens the pathway to unprecedented fine control and optimization of the growth of functional nanostructures for potential applications ranging from chemical sensing to high speed data transfer.
New imaging-based chemical analysis of atomic layers
February 14, 2014 — A new Z-contrast image analysis method now allows dopant atoms in two-dimensional materials to be located and quantified. With this ability, the distribution of dopants can be verified as the physical and chemical properties are modified. This new capability was used to study doped molybdenum disulfide in which the optical band gap was tuned between 1.85 and 1.
Eighth Shull Fellow to Focus on Biochemistry and Crystallography
February 07, 2014 — Biochemist and molecular biologist Mayank Aggarwal has been awarded this year’s Clifford G. Shull Fellowship. Aggarwal is the eighth fellow to join the Neutron Sciences Directorate at Oak Ridge National Laboratory since the program began in 2006.
Enhancing the Efficiency of Solar Energy Conversion in Titania
February 04, 2014 — A new method that simultaneously incorporates chromium (Cr) and nitrogen (N) atoms as Cr-N pairs into titania yields a material with an extraordinarily large (> 1 eV) band gap reduction.
Evidence for non-uniform superconductivity in iron-based materials
January 31, 2014 — Multi-scale bulk and local electronic and structural studies on an iron-based superconductor have revealed, for the first time, an origin of non-bulk superconductivity. Understanding the role of chemical doping in causing superconductivity can potentially lead to the design of advanced high-temperature superconductors (HTS).