Structural stability and mutual transformations of molybdenum carbide, nitride and phosphide

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2011.07.023· OSTI ID:22210111

Yao, Zhiwei ^[1]; Lai, Zhuangchai; Zhang, Xiaohong ^[1]; Peng, Feng ^[1]; Yu, Hao; Wang, Hongjuan ^[1]

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1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640 (China)

Graphical abstract: Both Mo{sub 2}C and Mo{sub 2}N can be transformed to MoP, whereas the reverse changes are inviable, which is used to develop a promising and practical pathway for preparing MoP nanoparticles. Highlights: {yields} Mo carbide, nitride and phosphide are prepared. {yields} The structural stability increases in the order of Mo{sub 2}N < Mo{sub 2}C < MoP. {yields} Both Mo{sub 2}C and Mo{sub 2}N can be transformed to MoP, whereas the reverse changes are inviable. {yields} This study develops a promising and practical pathway for preparing MoP nanoparticles. -- Abstract: The structural stability and transformations of Mo carbide, nitride and phosphide were investigated under various atmosphere conditions by X-ray diffraction (XRD). The results indicated that the order of structural stability of these Mo-based compounds was as follows: Mo{sub 2}N < Mo{sub 2}C < MoP. Both Mo{sub 2}C and Mo{sub 2}N can be transformed to MoP, whereas the reverse transformations did not occur. Noticeably, compared with those Mo sources containing oxygen, the use of Mo{sub 2}C/Mo{sub 2}N as Mo-source can produce finely dispersed MoP nanoparticles by the temperature-programmed reaction (TPR) method. The result was probably due to the fact that lower-levels H{sub 2}O generated during synthesis process can avoid strong hydrothermal sintering. The influence of formation energy had been considered and was found to relate to the structural stability and transformations of these Mo-based compounds.

• OSTI ID: 22210111
• Journal Information: Materials Research Bulletin, Vol. 46, Issue 11; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
FORMATION HEAT
INORGANIC COMPOUNDS
MOLYBDENUM CARBIDES
MOLYBDENUM NITRIDES
NANOSTRUCTURES
STABILITY
SYNTHESIS
X-RAY DIFFRACTION