Synthesis of nanocrystalline molybdenum carbide (Mo2C) by solution route

Patel, Manish; Subrahmanyam, J. P.

doi:10.1016/j.materresbull.2007.09.025

Cited by 46 publications

(20 citation statements)

References 8 publications

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“…In recent years several alternative methods have been reported for the synthesis of nanostructured and ultrafine molybdenum carbide at substantially lower temperatures. These include sonochemical synthesis [12], molten salt synthesis using mechanically milled powder [13], mechanosynthesis [14], alkalide reduction [15], carbothermic reduction [16][17][18], solution route [19] and plasma assisted synthesis [20]. Mo 2 C formation, along with metastable phases like ␦-MoC 1−x and ␥-MoC 1−x , has been reported by chemical vapor deposition (CVD) technique [21,22].…”

Section: Introductionmentioning

confidence: 99%

Structural stability of α/β-Mo2C during thermochemical processing

Reddy

Rao

Revathi

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Structural stability of α/β-Mo2C during thermochemical processing

Reddy

Rao

Revathi

et al. 2010

Journal of Alloys and Compounds

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“…RTXRD was used in order to confi rm the identity of WC 9 as hexagonal carbide. The identity of WC 10 , WC 11 , and WC 17 most closely corresponds to a form of WC 1-x . Fig.…”

Section: Kinetic Synthesis Models For Mo2c and Wcmentioning

confidence: 77%

“…Carbide materials (WC 9 , WC 10 , WC 17 ) prepared with a 1:1 ratio of CH 4 /H 2 yielded different results upon visual inspection of the products. WC 9 powders were comprised of grayish-metallic grains similar to those of Mo 2 C and Mo 2 N. WC10 powders were brown, while WC 11 and WC 17 yielded dark-purple powders. The only noticeable difference in the preparation of these materials was the change in temperature ramping rates Δ 1 and Δ 2 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model

Covington

Munirathinam

Islam

et al. 2012

Polish Journal of Chemical Technology

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Powders of two molybdenum carbides (Mo 2 C and MoC 1-x ) and tungsten carbide (WC) were prepared by means of temperature programmed reaction (TPR) method. Mo 2 C and MoC 1-x were synthesized by reacting MoO 3 with a preselected molar ratio of methane/hydrogen and carbon monoxide/hydrogen gas mixtures respectively. WC was prepared using tungsten oxide (WO 3 ) and a methane/hydrogen gas mixture. These carbides were ultrasonically dispersed in de-ionized water. Samples were characterized using room temperature x-ray diffraction and scanning microscopy. A kinetic diffusion model is also studied to determine diffusivities in solids where the diffusing species desorbs or reacts at the external surfaces, and where the diffusivity does not vary appreciably with concentrations. The method involves measuring the fl ux of the diffusive species into the solid under the infl uence of a temperature program.

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“…(5) shows that the reaction between methane and MoO 3 in the presence of hydrogen leads to solid MoO 2 , gaseous CO and H 2 O species. Eq.…”

Section: Thermodynamic Modeling Of Reaction Pathways To Mo 2 C Formationmentioning

confidence: 99%

“…Molybdenum carbide powder is conventionally produced by powder metallurgical route [4]. Other methods now widely used for the synthesis of molybdenum carbide include solution route, sonochemical synthesis, alkalide reduction, temperature programmed carbothermal hydrogen reduction and chemical vapor deposition [5]. Among these methods, temperature programmed reaction between oxide precursors and a flowing mixture of hydrogen and carbon-containing gases has been an important one employed for the synthesis of molybdenum carbide particles which exhibit exceptionally high catalytic activity in hydrogen-involved reactions [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%