Solid–solid interactions in Co3O4–MoO3/MgO system

Radwan, Nagi R.E.; Ghozza, A.M.; El-Shobaky, G.A.

doi:10.1016/s0040-6031(02)00369-6

Cited by 43 publications

(22 citation statements)

References 40 publications

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“…By using the EVA software, the representative peaks for MgO, CoO, MoO 3 and MgMoO 4 /CoMoO 4 were identified in the XRD spectra. From [13]. This is the cause that the intensities of MgMoO 4 and/or CoMoO 4 peaks increased with increasing the Mo content as observed in this study.…”

Section: Xrd Characterization Of Catalystssupporting

confidence: 67%

“…Each catalyst component has its identical role in the catalytic reaction for the growth of CNTs. Molybdenum (Mo), a transition metal, is well known for its role as a promoter of catalysts in the CCVD reaction for CNTs formation [11][12][13][14][15][16]. One of the advantages of adding Mo into the bimetallic catalysts is the ability to manipulate the selectivity of the process towards the formation SWCNTs or MWCNTs by modifying the Mo to active metal ratio [11].…”

Section: Introductionmentioning

confidence: 99%

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The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

Yeoh

Lee

Chai

et al. 2010

Journal of Alloys and Compounds

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Section: Xrd Characterization Of Catalystssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

Yeoh

Lee

Chai

et al. 2010

Journal of Alloys and Compounds

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“…The samples synthesized higher than 880 C by solid-state reaction have a single rocksalt-type structure; this feature is similar to the thermal decomposition of the spinel-type Co 3 O 4 to rocksalt-type CoO occurring at about 900 C. [9][10][11] The fact that the XRD peaks of the obtained rocksalt phase (Fig. 1) are located at intermediate positions between those of MgO and CoO suggests that Mg 2þ and Co 2þ are substituted mutually due to inter-diffusion in these phases.…”

Section: Discussionmentioning

confidence: 57%

Synthesis of Spinel-Type Magnesium Cobalt Oxide and Its Electrical Conductivity

et al. 2008

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This work devotes to investigate synthesis and electrical properties of spinel MgCo 2 O 4 that is considered as a candidate of the cathode materials of magnesium-ion batteries in future. Samples were synthesized by two types of techniques: solid-state reaction and wet process. The crystal structures of the samples were analyzed by X-ray diffraction, and their electrical conductivities were obtained through the dc resistance and ac impedance measurements. By solid-state reaction, sample of a single MgCo 2 O 4 phase was not obtained; a sample synthesized at 800 C for 24 h after milling of Co 3 O 4 and MgO powder was comprised of dual phases of spinel-type and rocksalt-type structures, and samples synthesized at temperatures higher than 880 C showed a single rocksalt-type phase without electrical conductance. The former sample showed p-type semiconducting behavior as well as spinel-type Co 3 O 4 , but its electrical conductivity around room temperature was shown to exceed that of Co 3 O 4 . In contrast, a sample consisting of a single spinel-type phase was successfully synthesized by wet process, which exhibited an electrical conductivity of the order 10 À2 Scm À1 , being much higher than those of the samples synthesized by solid-state reaction. Thus, substitution of Co 2þ in Co 3 O 4 with Mg 2þ is found to enhance the electrical conductivity of the spinel-type phase.

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“…These compounds were also studied for their electronic [5][6][7] and magnetic properties. 8,9 Moreover, (Co, Ni)MoO 4 1,10,11 and (Co, Fe)MoO 4 12-15 systems received much attention due to their ability to undergo a phase transition. It appears from all these studies that the aforementioned solid solutions were complete and that transition temperatures were composition dependent.…”

Section: ' Introductionmentioning

confidence: 99%

Investigation of the First-Order Phase Transition in the Co_1−xMg_xMoO₄Solid Solution and Discussion of the Associated Thermochromic Behavior

Robertson¹,

Gaudon²,

Jobic³

et al. 2011

Inorg. Chem.

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A series of compounds of Co(1-x)Mg(x)MoO(4) compositions has been prepared by a conventional ceramic route. The members of the whole solid solution exhibit a reversible first-order phase transition which was probed by using thermal expansion and low-temperature reflectivity techniques. Whereas the α → β transition temperature evolves linearly on warming from 435 to 200 °C with x going from 0 to 0.9, the β → α transition temperature variation falls down on cooling from -40 °C to -140 °C going from CoMoO(4) to Co(0.1)Mg(0.9)MoO(4) with an asymptotic evolution. The phase transition temperatures have been explained on the basis of a crystal polarization effect under substitution of Mg for Co. Thus, from an applicative point of view, new thermochromic pigments with tunable transition temperatures are here proposed.

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Solid–solid interactions in Co3O4–MoO3/MgO system

Cited by 43 publications

References 40 publications

The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

Synthesis of Spinel-Type Magnesium Cobalt Oxide and Its Electrical Conductivity

Investigation of the First-Order Phase Transition in the Co_1−xMg_xMoO₄Solid Solution and Discussion of the Associated Thermochromic Behavior

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Solid–solid interactions in Co3O4–MoO3/MgO system

Cited by 43 publications

References 40 publications

The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

The role of molybdenum in Co-Mo/MgO for large-scale production of high quality carbon nanotubes

Synthesis of Spinel-Type Magnesium Cobalt Oxide and Its Electrical Conductivity

Investigation of the First-Order Phase Transition in the Co1−xMgxMoO4Solid Solution and Discussion of the Associated Thermochromic Behavior

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Investigation of the First-Order Phase Transition in the Co_1−xMg_xMoO₄Solid Solution and Discussion of the Associated Thermochromic Behavior