Mechanosynthesis of molybdenum carbides by ball milling at room temperature

Xia, Z.P.; Shen, Yanfeng; Shen, Jian; Li, Z.Q.

doi:10.1016/j.jallcom.2006.11.166

Cited by 40 publications

(18 citation statements)

References 29 publications

(24 reference statements)

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“…We note that in several experimental runs (see description on Mo carbide in Supplementary Discussion), X-ray diffraction showed varyingly small amounts of an unexpected phase (Supplementary Fig. 3a) having a FCC crystal symmetry, which we attributed to a Mo carbide353637 impurity. In contrast to the diffuse scattering method, the quenched microstructure criterion of this study enables the melting signature to be traced back to the appropriate phase by examining the corresponding Debye rings (that is, BCC Mo versus Mo carbide).…”

Section: Resultsmentioning

confidence: 74%

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Microstructures define melting of molybdenum at high pressures

2017

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High-pressure melting anchors the phase diagram of a material, revealing the effect of pressure on the breakdown of the ordering of atoms in the solid. An important case is molybdenum, which has long been speculated to undergo an exceptionally steep increase in melting temperature when compressed. On the other hand, previous experiments showed nearly constant melting temperature as a function of pressure, in large discrepancy with theoretical expectations. Here we report a high-slope melting curve in molybdenum by synchrotron X-ray diffraction analysis of crystalline microstructures, generated by heating and subsequently rapidly quenching samples in a laser-heated diamond anvil cell. Distinct microstructural changes, observed at pressures up to 130 gigapascals, appear exclusively after melting, thus offering a reliable melting criterion. In addition, our study reveals a previously unsuspected transition in molybdenum at high pressure and high temperature, which yields highly textured body-centred cubic nanograins above a transition temperature.

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Section: Resultsmentioning

confidence: 74%

“…Mo is one of the materials well known to form carbides with a variety of stoichiometries and structural polymorphs353637. Moreover, any form of Mo carbide is expected to melt at a lower temperature than pure Mo; therefore, it is important to consider a possible presence of carbide in the sample when studying the melting of pure Mo.…”

Section: Resultsmentioning

confidence: 99%

Microstructures define melting of molybdenum at high pressures

2017

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“…Up to now, different methods have been developed for preparing molybdenum carbides in a number of researches. Molybdenum carbides are prepared in a classical way of metallurgical process, which has been proved to be inefficient and expensive [5,6]. Furthermore, chemical methods are widely used for the preparation of molybdenum carbides.…”

Section: Introductionmentioning

confidence: 99%

Preparation of molybdenum carbides with multiple morphologies using surfactants as carbon sources

Wang

Chen

2012

Journal of Solid State Chemistry

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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%