[en] The structure of β'-MoO₃, a new modification of MoO₃, is closely related to the structure of ReO₃ and has been refined using high resolution neutron powder diffraction data and the Rietveld technique. The structure is monoclinic (P2₁/n, a = 7.415(1), b= 7.433(1), c = 7.654(1), A, β = 90.09(2)). β'-MoO₃ is isostructural with the room temperature monoclinic modification of WO₃ and may be derived from the deuterated intercalate (D_xMoO₃), also with ReO₃-type structure, by heating in oxygen at 200 degrees C. The modification is structurally intermediate between the WO₃-type and the thermodynamically stable α-MoO₃. (author) 9 refs., 2 figs., 2 tabs

[en] Lithographic properties of amorphous MoO₃ films exposed to a glow discharge hydrogen plasma have been investigated. It has been observed that the etching rate of an exposed film in alkaline solution is lower compared to an unexposed one, giving rise to a negative tone behavior of the material. The etching characteristics as a function of exposure time and substrate temperature (during exposure) and their correlation with optical transmission have been studied. The contrast (γ) obtained is 4.2

[en] Highlights: • Preparation of Pd/MoO₃ sample by sonophotodeposition method. • The effect of sonophotodeposition on hydrogen bronze formation process. • Palladium nanoclusters formation during sonophotodeposition treatment.

[en] Hydrogen molybdenum bronze, H/sub x/MoO/sub 3/ (O< x<2), was produced for the first time as ceramic in a low-temperature process. The elastic properties of the material were measured by ultrasound technique. For H/sub 1.6/MoO/sub 3/ ceramic an anomaly in the sound velocity was found near 200 K. This effect is connected with a significant thermal hysteresis. This behaviour and the correlation with positions and dynamics of the hydrogen in the lattice are discussed

No abstract available

[en] We study the conductivity of thin films of molybdenum oxide (MoO_x) mixed with an organic hole transport material, such as N,N′-bis(naphthalen-1-yl)-N,N′-bis (phenyl)benzidine or 4′,4″-tri(N-carbazolyl)triphenylamine, in lateral test devices. Contrary to previous reports, the conductivity of the mixture is found to exceed that of neat MoO_x, exhibiting ∼ 5 orders of magnitude higher conductivity in comparison to the neat films. Studies also show that the mixing enhances both hole and electron transport. The higher conductivity may be attributed to a higher concentration of “free” carriers in the mixture, as a result of the formation of a charge transfer complex between the MoO_x and the hole transport material. The findings shed light on the potential of hybrid composites of inorganic and organic materials in realizing enhanced conductivity. - Highlights: • We investigate the conductivity of mixtures of MoO_x and hole transport material (HTM). • Materials are studied in lateral devices instead of conventional vertical devices. • Mixing MoO_x with HTM brings > 5 orders of magnitude increase in bulk conductivity. • The mixture of MoO_x and HTM enhances both hole and electron transport

[en] Selective oxidation of hydrogen sulfide, a highly toxic industrial gas which is produced by petroleum refineries and natural gas processing plants in increasing amounts, was studied over iron-molybdenum oxides with various Fe-Mo ratios. An unexpected synergistic phenomenon in catalytic activity was observed for the Fe-Mo binary oxides, suggesting that a new compound (Fe₂(MO₄)₃) is formed in the binary oxide which is more active than the single oxide catalysts Fe₂O₃ and MoO₃. The reaction order obtained suggests that catalyst activity is governed mainly by the adsorption and activation of the reactant hydrogen sulfide, which is an acidic compound with an electronegative sulfur atom and two electropositive hydrogen atoms. 17 refs., 1 tab., 4 figs

No abstract available

[en] Porous glass prepared by acid leaching of phase-separated soda borosilicate glass usually contains colloidal silica which originates from the silica component in the borate phase. Molybdenum trioxide was added to the starting borosilicate glass to prevent the formation of colloidal silica. It promoted the opacification of the starting glass. Opaque glasses in as-cast state showed a spherical phase-separated structure and were amorphous by X-ray doffraction. The phase separation was related to the solubility of molybdenum oxide in the glass. The phase separation occurs at a high temperature and proceeds rapidly in the cooling process of the cast glass. Another type of phase separation, which was assigned to the phase separation in the ternary soda borosilicate glass, took place during the heat treatment of the opaque glasses. When the phase-separated structure of the heat-treated glasses is interconnected, the porous glasses composed of silica skeleton are obtained by the acid leaching of the phase-separated glasses. The colloidal silica in the porous glass increased with increasing silica content of the starting glass and at the same time the volume of the pores of skeleton decreased markedly. (author)

[en] MoO₂ nanospheres are successfully synthesized by a simple ethylene glycol-assisted hydrothermal route. The formation process is associated with the dissolution-recrystallization mechanism under the ethylene glycol reduction, resulting in a unique structure of that solid MoO₂ nanospheres assembled by many ultrafine primary nanoparticles. Benefiting from the hierarchical structural features, the MoO₂ nanospheres electrode displays a higher specific capacitance (204.7 and 197.4 Fg⁻¹ at 1 and 6 A g⁻¹, respectively) and exhibits a significant superior cycling stability (the specific capacitance maintains 90.6% after 1000 cycles at 1 A g⁻¹). (paper)