Studies on Molybdenum Oxides.

Kihlborg, L. H. E.; Sundholm, Anita; Magnéli, Arne; Högberg, B.; Kneip, P.; Palmstierna, H.

doi:10.3891/acta.chem.scand.13-0954

Cited by 185 publications

(100 citation statements)

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“…probe technique and these results are also included in Table 1. These results are consistent with available data RESULTS and reflect the general trend that as the metal-to-oxygen ratio increases, the conductivity increases (15,32,33). .…”

Section: Introductionsupporting

confidence: 81%

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Smith

Rohrer

1996

Journal of Solid State Chemistry

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Section: Introductionsupporting

confidence: 81%

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Smith

Rohrer

1996

Journal of Solid State Chemistry

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“…In a study of the molybdenum-oxygen system a phase called 0-oxide was observed to form in a very narrow temperature interval around 500°C (Kihlborg, 1959). It was assumed to be metastable at the formation temperature since it appeared only in samples heat-treated for short periods of time and decomposed upon prolonged heating.…”

Section: Introductionmentioning

confidence: 99%

Mo5O14 – twinning and three-dimensional structure, determined from a partly tantalum-substituted crystal

Yamazoe¹,

Kihlborg²

1975

Acta Crystallogr Sect B

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The structure of MosOt4 was solved previously in projection and found to be a 'tunnel structure', similar to those of M017047 and Wt8049, consisting of MoO6 octahedra and MoO7 pentagonal bipyramids. Crystals of this phase, stabilized by substitution of tantalum for 7 % of the molybdenum, have been studied by single-crystal diffractometry. A refinement of the (seemingly) tetragonal projection (a"__23 ,~) indicates that tantalum substitutes exclusively in the pentagonal bipyramids. Like the binary phase, these crystals exhibit a superstructure and concomitant twinning associated with off-centre displacements of the atoms (puckering) along the short c (~_ 4 A) axis. From an observed slight difference in the relative amounts of the two twin components in one crystal, it could be concluded that the symmetry of the superlattice is orthorhombic, with a = 2a" and b = a", and not tetragonal as suggested previously. The puckering scheme and the three-dimensional structure were determined by the use of partial Patterson functions calculated from the twin-free superlattice reflexions. The twinning and disorder are readily understood as results of the pronounced pseudosymmetry. The degree of twinning and the size of the coherently scattering regions seem related to the conditions of formation.

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“…The kinetics of the reduction processes have been investigated by many authors (Refs. [12][13][14][15][16] and references therein). In numerous papers (see, for example, [13]), the reduction of MoO 3 by hydrogen or hydrocarbons as well as other gases has been reported.…”

Section: Introductionmentioning

confidence: 99%

In situ X‐ray analysis of MoO₃ reduction

Leisegang¹,

Levin

Walter³

et al. 2004

Cryst. Res. Technol.

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The reduction of MoO 3 to MoO 2 under hydrogen/argon atmosphere (5 vol. % H 2 /95 vol. % Ar) in the temperature range 323 K…623 K was studied in situ by means of wide-angle X-ray scattering. It has been found that the starting material, MoO 3 , consists of two different orthorhombic MoO 3 phases A and B with nearly the same structure parameters. The phase A (fraction of 37.1 wt%) describes the larger crystallites whereas the phase B (fraction of 62.9 wt.%) describes the smaller crystallites. Under the reduction to monoclinic MoO 2 phase during the heating , the thermal evolution of the phase fractions is different. A conclusion is drawn that MoO 2 is formed preferably in big crystallites. About 10 wt. % of MoO 2 has been found to form at 623 K resulting in about 69 wt. % after cooling to room temperature followed by holding in Ar/H 2 atmosphere about 24 h. Additionally, about 4.4 wt. % of the Mo 4 O 11 oxide probably formed in large crystallites was detected in the reduced powder after the cooling.

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Studies on Molybdenum Oxides.

Cited by 185 publications

References 0 publications

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Mo5O14 – twinning and three-dimensional structure, determined from a partly tantalum-substituted crystal

In situ X‐ray analysis of MoO₃ reduction

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Studies on Molybdenum Oxides.

Cited by 185 publications

References 0 publications

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Scanning Probe Microscopy of Cleaved Molybdates: α-MoO3(010), Mo18O52(100), Mo8O23(010), and η-Mo4O11(100)

Mo5O14 – twinning and three-dimensional structure, determined from a partly tantalum-substituted crystal

In situ X‐ray analysis of MoO3 reduction

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In situ X‐ray analysis of MoO₃ reduction