0000000000255488

AUTHOR

Silvia Alconchel

showing 3 related works from this author

Itinerant Electron Metamagnetism in η-Carbide-Type Compound Co3Mo3C

2010

We report the magnetic properties of the cobalt molybdenum η-carbide-type compounds Co 3 Mo 3 C and Co 3 Mo 3 N. The magnetic susceptibility χ of Co 3 Mo 3 C shows a Curie–Weiss temperature dependence at high temperatures and a broad maximum at around 100 K, whereas that of Co 3 Mo 3 N shows a nearly temperature-independent enhanced Pauli paramagnetic behavior. The absence of a magnetic long-range order was confirmed by the nuclear magnetic resonance technique in both the compounds. As expected from the broad maximum of χ, we observed an itinerant electron metamagnetic transition at around 37 T in Co 3 Mo 3 C.

Curie–Weiss lawMaterials scienceCondensed matter physicsGeneral Physics and Astronomychemistry.chemical_elementMagnetic susceptibilityCarbideCrystallographyParamagnetismchemistryMolybdenumCurie temperatureCobaltMetamagnetismJournal of the Physical Society of Japan
researchProduct

From nitrides to carbides: topotactic synthesis of the η-carbides Fe3Mo3C and Co3Mo3C

2004

The molybdenum bimetallic interstitial carbides Fe(3)Mo(3)C and Co(3)Mo(3)C have been synthesized by temperature-programmed reaction (TPR) between the molybdenum bimetallic interstitial nitrides Fe(3)Mo(3)N and Co(3)Mo(3)N and a flowing mixture of CH(4) and H(2) diluted in Ar. These compounds have been characterized by X-ray diffraction, laser Raman spectroscopy, elemental analysis, energy dispersive analysis of X rays, thermal analysis (in air) and scanning electron microscopy (field emission). Their structures have been refined from X-ray powder diffraction data. These carbides crystallize in the cubic system, space group Fd3m[a= 11.11376(6) and 11.0697(3)[Angstrom] for Fe and Co compound…

Inorganic ChemistryField electron emissionCrystallographyMaterials sciencechemistryScanning electron microscopeMolybdenumchemistry.chemical_elementNitrideThermal analysisBimetallic stripPowder diffractionCarbideDalton Trans.
researchProduct

Monitoring the carburization of molybdenum bimetallic nitrides and oxynitrides with CH4/H2/Ar mixtures: identification of a new carbonitride.

2008

A new carbonitride Ni2Mo3(CxNy) has been synthesized by temperature-programmed carburization of the Ni2Mo3N precursor with a CH4/H2/Ar gas mixture at 923 K. This compound has been characterized by X-ray diffraction, elemental analysis, Auger electron spectroscopy, laser Raman spectroscopy, thermogravimetric analysis and field-emission scanning electron microscopy. Ni2Mo3(CxNy) crystallizes in the cubic space group P4(1)32, with a lattice parameter of a=6.64575(3) A, corresponding to the unusual filled beta-Mn structure. Its formation occurs by partial substitution of N by C via a topotactic and pseudomorphic reaction and its stability in air is higher that of Ni2Mo3N. A two-phase mixture wi…

Inorganic ChemistryThermogravimetric analysisAuger electron spectroscopyMaterials scienceLattice constantchemistryScanning electron microscopeMolybdenumElemental analysisPhysical chemistrychemistry.chemical_elementNitrideBimetallic stripDalton transactions (Cambridge, England : 2003)
researchProduct