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Room-temperature ferromagnetism in carbon-doped ZnO.

We report ferromagnetism in carbon-doped ZnO. Our first-principles calculations based on density functional theory predicted a magnetic moment of 2.02 mu(B) per carbon when carbon substitutes oxygen in ZnO, and an ferromagnetic coupling among magnetic moments of the carbon dopants. The theoretical prediction was confirmed experimentally. C-doped ZnO films deposited by pulsed-laser deposition sh...

Superconductivity in room-temperature stable electride and high-pressure phases of alkali metals.

S-band metals such as alkali and alkaline earth metals do not undergo a superconducting transition (SCT) at ambient pressure, but their high-pressure phases do. By contrast, room-temperature stable electride [Ca(24)Al(28)O(64)](4+)⋅4e(-) (C12A7:e(-)) in which anionic electrons in the crystallographic sub-nanometer-size cages have high s-character exhibits SCT at 0.2-0.4 K at ambient pressure. I...

Absence of superconductivity in the high-pressure polymorph of MgB2

Yanming Ma,1,2,* Yanchao Wang,1 and Artem R. Oganov2,3 1National Lab of Superhard Materials, Jilin University, Changchun 130012, People’s Republic of China 2Laboratory of Crystallography, Department of Materials, ETH Zurich, Wolfgang-Pauli-Stress 10, CH-8093 Zurich, Switzerland 3Geology Department, Moscow State University, 119992 Moscow, Russia Received 22 October 2008; revised manuscript recei...

Molecular carbon dioxide at high pressure and high temperature

Synthesis and Characterization of Amine-modified Mesoporous SBA-15 for Carbon Dioxide Sequestration at High Pressure and Room Temperature (RESEARCH NOTE)

Amine-modified mesoporous SBA-15 adsorbent has been prepared by impregnation method using tetraethylenepentamine. The samples of this modified SBA-15 have been characterized by small angle X-ray scattering (SAXS), Scanning electron microscopy (SEM), Nitrogen adsorption-desorption isotherm and FT-IR. The adsorption capacity of CO2 on unmodified and modified samples were measured at high pressure...