From nitrides to carbides: topotactic synthesis of the eta-carbides Fe3Mo3C and Co3Mo3C |
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Authors: | Alconchel Silvia Sapiña Fernando Martínez Eduardo |
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Institution: | Departamento de Quimica, Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina. salco@fiqus.unl.edu.ar |
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Abstract: | 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 Fd3ma= 11.11376(6) and 11.0697(3)Angstrom] for Fe and Co compounds, respectively]. |
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