December 5, 2017 03:50 PM

In general, few single-crystal organic monomers react under topochemical control to produce single-crystal extended solids. Using a slow compression under uniaxial stress, a team using HPCAT facilities has successfully converted polycrystalline or single-crystal benzene monomer into single-crystalline packings of carbon nanothreads, a one-dimensional sp3 carbon nanomaterial. More...

December 5, 2017 04:02 PM

The core–mantle boundary (CMB) represents a region with the largest compositional and rheological contrast within the Earth. Seismological studies have revealed a number of thin domains, with variable thicknesses of 5–40 km, lying directly above the CMB, called ULVZs. However, their origin has long been debated. Recently at HPCAT, hydrogen-bearing iron peroxide (FeO2Hx) in the pyrite-type crystal structure was found to be stable under the conditions of the lowermost mantle.  More...

November 2, 2017 11:23 AM

The behavior of the f-electrons in the lanthanides and actinides governs important macroscopic properties but their pressure and temperature dependence is not fully explored. A team from Lawrence Livermore National Laboratory and the Carnegie Institute of Washington has measured the longitudinal (cL) and transverse sound speeds (cT) vs pressure from room temperature to TC for the first time.  More....

October 6, 2017 06:03 PM

Lithium–air (Li–O2) batteries may possess energy densities close to that of gasoline. It is commonly known that the Li–O2 battery often forms insoluble discharge products, mainly oxides, which accelerate the degradation of the electrode and electrolyte, thus reducing the cycle stability and efficiency. Investigation of the stability of oxygen-rich lithium oxides would greatly extend our knowledge on improving the capability and lifetime of lithium–air batteries. More...

September 18, 2017 11:19 AM

Magnesium is the lightest structural metal, 35% lighter than aluminum and 78% lighter than steel, thus possessing an exceptional lightweightness (strength-to-weight ratio). However, because of its hexagonal close packed (hcp) structure, the associated slips in hcp-Mg often causes Mg having limited ductility and formability. A research group using the HPCAT facility has synthesized 5 nm/5 nm Mg/Nb nanocomposites that display exceptional strength, ductility, and thermal stability.  More...