Results 21 to 30 of about 34,772 (314)

On the nature of pressure‐induced coordination changes in silicate melts and glasses [PDF]

, 1987
Progressive decreases in the Si‐O‐Si angles between corner‐shared silicate tetrahedra in glasses and melts with increasing pressure can lead to arrangements of oxygen atoms that can be described in terms of edge‐ or face‐shared octahedra.
Ahrens, Thomas J., Stolper, Edward M.
core   +1 more source

Elucidating the crystal-chemistry of Jbel Rhassoul stevensite (Morocco) by advanced analytical techniques [PDF]

, 2008
The composition of Rhassoul clay is controversial regarding the nature of the puremineral clay fraction which is claimed to be stevensite rather than saponite.
A. Maazouz, B. Rhouta, Barrakad, Benammi, Briant, Brindley, Caillère, Dammour, Duringer, Eberhart, F. Maury, F. Senocq, Faust, Fleischer, Guven, H. Kaddami, Holtzapffel, J. Elbarqy, J.- F. Gerard, Jacobs, Jeannette, Jolivet, L. Daoudi, M. Amjoud, Mackenzie, Millot, Rautureau, Trauth, Wilson   +28 more
core   +3 more sources

Surface magnetism in ZnO/Co3O4 mixtures [PDF]

, 2009
We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co3O4 despite the diamagnetic and antiferromagnetic character of these oxides respectively.
Carmona, N., de la Venta, J., Fernandez, J. F., Garcia, M. A., Jimenez-Villacorta, F., Llopis, J., Lorite, I., Quesada, A.   +7 more
core   +4 more sources

Hexaamminecobalt(III) hexacyanidomanganate(III)

Acta Crystallographica Section E, 2008
The asymmetric unit of the title compound, [Co(NH3)6][Mn(CN)6], contains one Co and one Mn atom, both lying on threefold inversion axes, and one NH3 and one CN group.
Hendrik G. Visser, Walter Purcell
doaj   +1 more source

First-principles calculations of the diffusion of atomic oxygen in nickel: thermal expansion contribution [PDF]

, 2007
Within the framework of density functional theory using the projector augmented-wave (PAW) method, we present some energetic properties of atomic oxygen interstitials in crystalline Ni, i.e.
Amarouche, Mohand, Megchiche, El Hocine, Mijoule, Claude   +2 more
core   +3 more sources

The identification and biogeochemical interpretation of fossil magnetotactic bacteria [PDF]

, 2008
Magnetotactic bacteria, which most commonly live within the oxic-anoxic transition zone (OATZ) of aquatic environments, produce intracellular crystals of magnetic minerals, specifically magnetite or greigite.
Kirschvink, Joseph L., Kopp, Robert E.
core   +1 more source

Theory and experiment of the ESR of Co$^{2+}$ in Zn$_2$ % (OH)PO$_4$ and Mg$_2$(OH)AsO$_4$

, 2001
Experiments of Electron Spin Resonance (ESR) were performed on Co$% ^{2+}$ substituting Zn$^{2+}$ or Mg$^{2+}$ in powder samples of Zn$_2$(OH)PO$_4$ and Mg$_2$(OH)AsO$_4$.
G.E. Barberis, Goñi, Harrison, J.L. Mesa, J.M. Rojo, Keller, L. Lezama, M.C. dos Santos, M.E. Foglio, Stewart, T. Rojo   +10 more
core   +1 more source

Di-μ2-acetato-1:2κ2O:O′;2:3κ2O:O′-bis(N,N′-dimethylformamide)-1κO,3κO-bis{μ2-2,2′-[propane-1,3-diylbis(iminomethylene)]diphenolato-1κ4O,N,N′,O′:2κ2O,O′;2κ2O,O′:3κ4O,N,N′,O′-1,3-dinickel(II)-2-cadmium(II)

Acta Crystallographica Section E, 2008
The crystal structure of the title compound, [Ni2Cd(C17H16N2O2)2(C2H3O2)2(C3H7NO)2], contains discrete centrosymmetric hetero-trinuclear molecules in which Ni/Cd atom pairs are triply bridged via O atoms from the SALPD2− [N,N′-bis ...
Orhan Atakol, Leyla Tatar Yıldırım   +1 more
doaj   +1 more source

The growth and degradation of binary and ternary octahedral Pt–Ni-based fuel cell catalyst nanoparticles studied using advanced transmission electron microscopy

Advances in Physics: X, 2017
Advances in fuel cell technology depend strongly on the development of affordable, active, and stable catalysts. For example, octahedral Pt–Ni alloy nanoparticles show exceptional activity for the oxygen reduction reaction in fuel cell cathodes as a ...
Marc Heggen, Martin Gocyla, Rafal E. Dunin-Borkowski   +2 more
doaj   +1 more source

Coexistence of tetrahedral and octahedral-like sites in amorphous phase change materials

, 2007
Chalcogenide alloys are materials of interest for optical recording and non-volatile memories. We perform ab-initio molecular dynamics simulations aiming at shading light onto the structure of amorphous Ge2Sb2Te5 (GST), the prototypical material in this ...
Bernasconi, M., Caravati, S., Krack, M., Kuehne, T. D., Parrinello, M.   +4 more
core   +1 more source