Showing papers on "Molybdenum published in 1976"
TL;DR: A comparative study of the series of tungsten and molybdenum, α-XM12O40n− (X = BIII, SiIV, GeIV, PV, AsV) was carried out by using i.r. and Raman spectroscopy.
359 citations
TL;DR: In the passive region of austenitic stainless steels alloyed with Mo, the formation of MoO42− ions can be expected in neutral halide solutions by the transpassive dissolution of Mo as discussed by the authors.
Abstract: In the passive region of austenitic stainless steels alloyed with Mo, the formation of MoO42− ions can be expected in neutral halide solutions by the transpassive dissolution of Mo. It has...
129 citations
TL;DR: In this article, the HeI induced valence electron spectra of benzene and hexafluorides of sulphur, molybdenum, tungsten and uranium are presented together with a HeII spectrum of sulfur hexaffluoride.
Abstract: HeI induced valence electron spectra of benzene and the hexafluorides of sulphur, molybdenum, tungsten and uranium are presented together with a HeII spectrum of sulphur hexafluoride. Vibrational band structure has been resolved in the spectra of all molecules and the energies of these bands are reported. A description is also given of the multichannel detector system which has facilitated the recordings of these spectra.
123 citations
107 citations
TL;DR: In this paper, the rates and extents of hydrogen sorption by platinised tungsten trioxide and molybdenum trioxide have been measured between 273 and 363 K and between 3 and 101 kN m-2.
Abstract: The rates and extents of hydrogen sorption by platinised tungsten trioxide and molybdenum trioxide have been measured between 273 and 363 K and between 3 and 101 kN m–2. Maximum diffusion coefficients for hydrogen spilling-over from platinum to the trioxide supports have been estimated. X-Ray diffraction, differential thermal analysis and thermogravimetric analysis, e.s.r. and i.r. spectroscopy indicate that the products of this spillover are hydrogen bronzes of tungsten and molybdenum. These may be represented as HxWO3, where x has a maximum value of 0.46, and HxMoO3, where x has a maximum value of 1.63. The latter violates the ranges of composition previously accepted for bronzes. The chemical and thermal stability of these bronzes is discussed in terms of their structures.
103 citations
TL;DR: In this paper, the discharge and charge reactions of MoO3 electrodes in organic Li+ electrolytes are shown to be reversible topotactic redox processes of layered molybdenum bronzes Lix+[MoO3]x−.
102 citations
98 citations
94 citations
Patent•
29 Jul 1976
TL;DR: A compound having the following general formula (I); STR1 as discussed by the authors, where R1 and R2 stand for a hydrocarbyl group having from 1 to 24 carbon atoms, x is a number of 0.5 - 2.3, useful as an additive for lubricants.
Abstract: A compound having the following general formula (I); ##STR1## wherein R1 and R2 stand for a hydrocarbyl group having from 1 to 24 carbon atoms, x is a number of 0.5 - 2.3, useful as an additive for lubricants.
81 citations
76 citations
TL;DR: In this article, a Cahn Electrobalance was used to determine directly and very accurately the carbon content of α-Fe, Fe-0.48 wt pct Mo and Fe-1.16 wtpct Mo specimens which were equilibrated with a series of methane-hydrogen gas mixtures.
Abstract: A Cahn Electrobalance has been used to determine directly and very accurately the carbon content of α-Fe, Fe-0.48 wt pct Mo and Fe-1.16 wt pct Mo specimens which were equilibrated with a series of methane-hydrogen gas mixtures. The equilibria investigated involved the ferrite phases of the alloys between 682 and 848‡C. The experimental results permitted direct calculation of the activities of carbon in the samples, relative to graphite as unity, and of other thermodynamic functions, without the necessity for any correction factors. The results have been compared with the experimental measurements of a number of other investigators. In ferrite, the partial molar enthalpy and entropy of solution of carbon are found to be 26,800 cal/mole, (112, 130 J/mole), and 30.59 cal/K-mole, (127.99 J/K-mole) respectively at temperatures below about 727‡C. Above this temperature, the values are 25,200 cal/mole and 29.13 cal/K-mole, respectively. The addition of molybdenum results in an increase in these properties below 727‡C and a decrease in the values above 753‡C, and the changes are found to be proportional to the molybdenum content. The solubility of carbon in α-Fe is found to be 0.0176 wt pct at the eutectoid temperature. Molybdenum increases the solubility relative to the Fe-C system at temperatures above the eutectoid and decreases it below the eutectoid.
TL;DR: In this article, Ni-15% CrMo alloys have been studied at 900°C in flowing and static oxygen atmospheres, and a molybdenum-rich oxide layer is detected adjacent to the alloy.
TL;DR: A protein that contains molybdenum, iron and labile sulphide has been isolated from Desulphovibrio gigas, and EPR spectra show the presence of two types of iron-sulphur centre in the molecule.
TL;DR: In this article, a study of the adsorption of sulphur on the (110) face of molybdenum using LEED and AES combined with a radioactive tracer technique employing 35 S. The content of the surface unit mesh can thus be determined precisely.
TL;DR: Kinetic studies on the reduction of the heme and tungsten centers of sulfite oxidase have shown that reduction of de-molybdo forms of sulfITE oxidase by sulfite is catalyzed by the residual traces of native molybdenum-containing molecules.
TL;DR: A Cahn Electrobalance has been used to determine directly and very accurately the carbon content of iron, iron-048 wt pct molybdenum and iron-116 wtpct Mo alloy as mentioned in this paper, which were equilibrated with a series of methane-hydrogen gas mixtures.
Abstract: A Cahn Electrobalance has been used to determine directly and very accurately the carbon content of iron, iron-048 wt pct molybdenum and iron-116 wt pct molybdenum specimens which were equilibrated with a series of methane-hydrogen gas mixtures of constant composition The equilibria investigated involved the austenite phases of the alloys at 783, 813 and 848‡C The experimental results permit direct calculation of the activities of carbon in the samples, relative to graphite as unity, and of the enthalpy and entropy of solution of carbon The results are compared with the experimental measurements of a number of other investigators The results are in excellent agreement with those of Smith and Schenck and Kaiser for the Fe-C system at 800‡C, and indicate -HC/M values of 9700 ± 500 cal/mole for pure Fe, 10,030 ± 500 cal/mole for an Fe-048 wt pct Mo alloy, and 10,150 ± 500 cal/mole for an Fe-116 wt pct Mo alloy The effect of molybdenum in austenite is to decrease the activity coefficient of carbon in austenite
TL;DR: In this paper, the effect of trace element and molybdenum levels on the fracture appearance transition temperature (FATT) of 2 l/4Cr-lMo steel was investigated.
Abstract: To minimize the temper-embrittlement susceptibility of 2 l/4Cr-lMo steel, minor changes in trace-element content and/or heat treatment will provide an improvement. Specimens containing two trace-element and six molybdenum levels were quenched and tempered to 100 ksi (690 N/mm2) tensile strength and embrittled by either isothermal aging at 900‡F (480°C) for 1000 h or step cooling. When 33 ppm of P, Sn, As, and Sb are present, fracture appearance transition temperature (FATT) remains at about -130°F (-90°C) between 0.5 and 1.4 pct Mo. When 405 ppm of the trace elements are present, embrittled FATT reaches a minimum -50‡F (-45°C). Thus, temper embrittlement can be suppressed by maintaining low trace-element concentrations. Intercritical heat treatment at 1575°F (855°C) also reduces temper embrittlement in air-cooled l/2 in. (13 mm) thick plates which simulate water-quenched heavy plates.
TL;DR: Studies on the respiratory nitrate reductase (EC 1.7.4) from Escherichia coli K12 by electron-paramagnetic-resonance spectroscopy indicate that its molybdenum centre is comparable with that in other molyBdenum-containing enzymes.
Abstract: Studies on the respiratory nitrate reductase (EC 1.7.99.4) from Escherichia coli K12 by electron-paramagnetic-resonance spectroscopy indicate that its molybdenum centre is comparable with that in other molybdenum-containing enzymes. Two Mo(V) signals may be observed; one shows interaction of Mo(V) with a proton exchangeable with the solvent and has: A (1H) 0.9-1.2mT; g1 = 1.999; g2=1.985; g3 = 1.964; gav. = 1.983. Molybdenum of both signal-giving species may be reduced with dithionite and reoxidized with nitrate.
TL;DR: The main signs of molybdenum poisoning are poor growth and anaemia, anorexia, diarrhoea and achromotrichia, joint and bone deformities, central nervous system degeneration and loss of crimp in wool (sheep).
Abstract: Molybdenum toxicity and the interactions between copper, molybdenum and sulphate are reviewed. The main signs of molybdenum poisoning are poor growth and anaemia (rat, chick, rabbit, cattle and sheep), anorexia (rat), diarrhoea and achromotrichia (cattle and sheep), joint and bone deformities (rat, rabbit, cattle), central nervous system degeneration and loss of crimp in wool (sheep). The following topics are discussed: (1) The effect of sulphate and sulphur compounds on molybdenum toxicity. (2) The effect of molybdenum on tissue copper levels. (3) The effect of molybdenum on the distribution of copper in plasma. (4) The effect of molybdenum on uptake and excretion of copper. (5) The possible existence of copper(II) molybdate in vivo. (6) The influence of molybdenum on sulphide production by ruminal micro-organisms. (7) Competition between molybdenum and sulphate in intestinal transport. (8) Interaction of sulphur with copper in vivo. (9) The possible involvement of molybdenum in gout and multiple sclerosis in humans.
TL;DR: In this article, the authors compared the performance of molybdenum catalysts in the metathesis of acetylenic hydrocarbons in the liquid phase at the temperature of boiling toluene.
Patent•
29 Dec 1976
TL;DR: In contrast to the prior art in which one, or at most two, of these properties are attained in one metallic glass, all those outstanding properties are achieved in a single metallic glass selected from one of the compositions of the invention.
Abstract: Metallic glasses having high permeability, low magnetostriction, low ac core loss and high thermal stability are disclosed. In contrast to the prior art in which one, or at most two, of these properties are attained in one metallic glass, all those outstanding properties are achieved in a single metallic glass selected from one of the compositions of the invention. The metallic glasses consist essentially of about 63 to 83 atom percent of at least one metal selected from the group consisting of iron and cobalt, from 0 to about 60% of which metal may be replaced with nickel, about 2 to 12 atom percent of at least one element selected from the group consisting of molybdenum, tungsten, niobium and titanium, and about 15 to 25 atom percent of at least one metalloid element selected from the group consisting of boron, phosphorus and carbon plus incidental impurities.
TL;DR: In this article, a nucleophilic attack on the central carbon of the η3-allylic group gave the metallocyclobutane compounds [W(η5-C5H5)2(CH2CHRCH2)] which, for RH, undergo deuteriation giving [W
Abstract: Nucleophilic attack by R–= H– or Me– on [W(η5-C5H5)2(η3-CH2CHCH2)]+PF6– occurs on the central carbon of the η3-allylic group giving the metallocyclobutane compounds [W(η5-C5H5)2(CH2CHRCH2)] which, for RH, undergo deuteriation giving [W(η5-C5H5)2H(CH2CHCH2D)]+PF6–; similar attack occurs on the analogous molybdenum compounds.
TL;DR: In this paper, a comparison of the infrared spectra of alumina with molybdenum oxide-alumina in both the oxidized and reduced forms was made, and it was shown that the reduced oxide is present as an interrupted monolayer.
TL;DR: In this article, a superconducting transition temperature T c up to 9.2 K and structural transformations are attributed to radiation induced disorder stabilized by the implanted impurity atoms, in particular the increase of T c is thought to be due to the formation of impurity defect complexes.
Patent•
02 Dec 1976
TL;DR: A hot workable austenitic stainless steel having superior pitting and crevice corrosion resistance to the chloride ion is presented in this paper, which consists essentially of, by weight, from 19 to 23% chromium, 5 to 16% nickel, 3 to 5% molybdenum, 2.5 to 15% manganese, up to 0.3% titanium, balance essentially iron.
Abstract: A hot workable austenitic stainless steel having superior pitting and crevice corrosion resistance to the chloride ion. The steel consists essentially of, by weight, from 19 to 23% chromium, 5 to 16% nickel, 3 to 5% molybdenum, 2.5 to 15% manganese, up to 0.01% sulfur, up to 0.1% of at least one element from the group consisting of cerium, calcium and magnesium, nitrogen from 0.2% up to its solubility limit, up to 0.1% carbon, up to 1% silicon, up to 3% copper, up to 1% columbium, up to 0.3% vanadium, up to 0.3% titanium, balance essentially iron.
TL;DR: A new non-functional modified form of milk xanthine oxidase is described, which contains molybdenum in a quinquivalent state, which is resistant to both oxidation and reduction.
Abstract: A new non-functional modified form of milk xanthine oxidase is described. This contains molybdenum in a quinquivalent state, which is resistant to both oxidation and reduction. The new species is derived from the native enzyme in a two-step process. The first step is the conversion into the desulpho form, via loss of the 'persulphide' sulphur, and the second involves reaction with ethylene glycol or other reagents. The species gives a characteristic Mo(V) electron-paramagnetic-resonance signal, without proton splittings, designated Resting II. This is virtually identical with signals reported previously from resting turkey liver xanthine dehydrogenase and rabbit liver aldehyde oxidase. The possibility is discussed that species Resting II, prepared with ethylene glycol, contains a -COCH2OH residue bound to a nitrogen ligand of molybdenum.