May 3rd, 2016
A special issue of the Journal of Organic Chemistry has been dedicated to the 50th anniversary of the discovery of the role of orbital symmetry in the control of organic cycloaddition reactions. The principles underlying the conservation of orbital symmetry and the consequences for understanding the mechanisms of such reactions have...
March 16th, 2016
EFree scientists from Carnegie have discovered a new transition metal pernitride, TiN2, which is ultraincompressible (bulk modulus ~360-385 GPa), and potentially a superhard material. Using a laser-heated diamond anvil cell, titanium nitride (TiN) and nitrogen (N2) were compressed to 73 GPa and heated to 2400 K. At these extreme...
March 2nd, 2016
Ferroelectric materials (switchable spontaneous electric polarization under an external electric-field) are also piezoelectric (convert mechanical energy into electric energy) and pyroelectric (convert a temperature change into electric energy). The combined properties of memory, piezoelectricity, and pyroelectricity, make ferroelectric...
February 24th, 2016
A new class of high Tc superconductors having a dense carbon framework structures is predicted using first-principles calculations. The current search for high-temperature superconductivity is now focused on materials containing low-Z elements due to the large phonon contribution necessary for BCS-type behavior. An additional strategy...
February 24th, 2016
Theoretical calculations based on the BCS phonon-mediated theory of superconductivity indicate that highly compressed solid hydrogen and main group hydrogen-rich materials can possess high Tc in predicted high pressure metallic states due to the existence of hydrogen-dominated vibrations. This proposal has motivated the search for...
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