نتایج جستجو برای: co3
تعداد نتایج: 1341 فیلتر نتایج به سال:
Reliably predicting how coral calcification may respond to ocean acidification and warming depends on our understanding of coral calcification mechanisms. However, the concentration and speciation of dissolved inorganic carbon (DIC) inside corals remain unclear, as only pH has been measured while a necessary second parameter to constrain carbonate chemistry has been missing. Here we report the ...
The electrochemical deposition and re-oxidation of solid carbon were studied in CO3(2-) ion-containing molten salts (e.g. CaCl2-CaCO3-LiCl-KCl and Li2CO3-K2CO3) at temperatures between 500 and 800 °C under Ar, CO2 or N2-CO2 atmospheres. The electrode reactions were investigated by thermodynamic analysis, cyclic voltammetry and chronopotentiometry in a three-electrode cell under various conditio...
The adsorption of selenite ions (SeO~-) from a dilute aqueous solution onto a freshly-cleaved calcite (1014) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO zis found to selectively adsorb at the CO~ site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO3)x(CO3) 1 x at the interface. The calcite (1014), (0006) and (1120) Bragg ...
Sr2SiO4:Eu phosphor for white light emitting diodes (LEDs) was synthesized by employing an as-prepared (Sr,Eu)CO3@SiO2 core-shell precursor as starting materials, and the effect of the core-shell precursor was also discussed on the crystal structure, particle morphology and luminescent properties of the resultant phosphor. The results showed that the hybrid βand α′-Sr2SiO4: Eu phosphor with fin...
The crystal structure of manganotychite has been refined using the holotype specimen from Alluaiv Mountain, Lovozero massif, Kola peninsula, Russia. mineral is cubic, Fd3¯, a = 14.0015(3) Å, V 2744.88(18) Å3, Z 8, R1 0.020 for 388 independently observed reflections. Manganotychite isotypic to tychite and ferrotychite. Its based upon three-dimensional infinite framework formed by condensation Mn...
Melting phase relations in the eclogite-carbonate system were studied at 6 GPa and 900–1500 °C. Starting mixtures prepared by blending natural bimineral eclogite group A (Ecl) with eutectic Na-Ca-Mg-Fe (N2) K-Ca-Mg-Fe (K4) carbonate (systems Ecl-N2 Ecl-K4). In system, subsolidus assemblage is represented garnet, omphacite, eitelite, a minor amount of Na2Ca4(CO3)5. Ecl-K4 includes clinopyroxene,...
The development of cost-efficient and long-term stable catalysts for the oxygen evolution reaction (OER) is crucial to produce clean sustainable H2 fuels from water. Here we demonstrate a cobalt vanadium oxide (CoVOx-300) working as such an efficient durable electrocatalyst. Such active catalyst beneficial balanced Co3+-O-V4+ species, which show high surface Co3+ contents with matched V4+ gener...
The properties of atmospheric CO2 fixation, metamagnetism, reversible guest adsorption and zero thermal expansion have been combined in a single robust MOF, [Cu3(bpac)3(CO3)2](ClO4)2·H2O (·H2O). This compound is a ditopically-bridged copper carbonate kagome lattice where desolvation of the MOF allows subtle tuning of the metamagnetic and uniaxial ZTE behaviour.
A Dy6 complex composed of two Dy3 triangular units, [Dy6(μ3-OH)(CO3)3(bsc)3(MeOH)14(H2O)](Cl)5·(H2O)·(MeOH)2 (1), was isolated and found to exhibit slow relaxation of the magnetisation under zero applied dc field, resulting in a high energetic barrier to relaxation.
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