• WordNet 3.6
    • n molybdenum a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
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Webster's Revised Unabridged Dictionary
    • n Molybdenum (Chem) A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic number 42. Atomic weight 95.94.
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Century Dictionary and Cyclopedia
    • n molybdenum Chemical symbol, Mo; atomic weight, 95. 8. A metal of a silver-white color, but harder than silver, which fuses with difficulty, if at all, at the highest temperature of a wind-furnace. Its specific gravity is 8. 6. It is chemically related to chromium, tungsten, and uranium, and, like those metals, forms trioxids which are acid-forming and yield very characteristic salts. It is remarkable for the number of oxids and corresponding chlorids which it forms; but it is the least important economically of the group to which it belongs. The most abundant ore of molybdenum is the sulphuret (molybdenite), and the strong external resemblance of this mineral to graphite (Latin plumbago) led to the confusion of molybdena with that substance; moreover, external resemblance and certain chemical peculiarities caused still further difficulties of nomenclature, in which manganese, antimony, and even magnesia were involved. Thus, the peroxid of manganese was called by Linnæus molybdænum magnesii. These perplexities were not cleared up until toward the end of the last century; but finally, as the result of the labors of Scheele, Bergman, and Hjelm (1778-90), the metal molybdena, or molybdenum, as it is now more generally called, was isolated from its combinations. The ores of molybdenum are somewhat widely diffused, but rarely occur in any considerable quantity. The principal molybdeniferous minerals are molybdenite and wulfenite. There is also a molybdic ocher (the trioxid) and a carbonate (pateraite); various ores of iron also contain traces of this metal.
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Chambers's Twentieth Century Dictionary
    • n Molybdenum mol-ib-dē′num a rare metal of a silvery-white colour—also Molybdē′na
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Webster's Revised Unabridged Dictionary
NL.: cf. F. molybdène,. See Molybdena
Chambers's Twentieth Century Dictionary
L.,—Gr.,—molybdos, lead.


In literature:

In the reducing flame, metallic molybdenum remains unchanged.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
"Occult Chemistry" by Annie Besant and Charles W. Leadbeater
Molybdenum or uranium may replace part of the tungsten.
"Creative Chemistry" by Edwin E. Slosson
F.; it can be used on metals such as molybdenum and pure tungsten.
"The Practical Values of Space Exploration" by Committee on Science and Astronautics
Molybdenum steels have been made commercially for twenty-five years, but they have not been widely exploited until since the war.
"The Working of Steel" by Fred H. Colvin
I took a coronium hack saw that will eat through molybdenum steel like so much cheese, and it just wore its teeth off.
"The Black Star Passes" by John W Campbell
Among the elements most used in this connection are manganese, silicon, chromium, nickel, tungsten, and molybdenum.
"An Elementary Study of Chemistry" by William McPherson
Molybdenum ores range from considerably less than 1 per cent to about 5 per cent in molybdenum.
"The Economic Aspect of Geology" by C. K. Leith
Reserves of steel-alloying minerals are reported to be available, particularly manganese, chromium, and molybdenum.
"Area Handbook for Bulgaria" by Eugene K. Keefe, Violeta D. Baluyut, William Giloane, Anne K. Long, James M. Moore, and Neda A. Walpole

In news:

An Al–O–Mo linkage is the active species in a molybdenum-based zeolite catalyst that converts methane to benzene.
Use and weldability of high- chromium molybdenum steels.
At least a dozen chromium molybdenum (CrMo) steel combinations exist.
Lantheus Extends NTP Radioisotopes Contract to Ensure Supply of LEU -Produced Molybdenum-99.
Lantheus Medical Imaging and Nordion Extend Molybdenum -99 Supply Contract Through 2015.
China Molybdenum Shares Triple on Debut.
Thompson Creek Metals, a producer of molybdenum in Canada and the US, plans to suspend some operations at its Idaho mine and cut about 100 jobs after prices fell for the metal used in steelmaking.
Chromium molybdenum —its uses and fabrication requirements.
Kennecott Utah Copper (KUC) announced that Rio Tinto, its parent company, will invest $340 million in the construction of a new molybdenum autoclave process (MAP) facility in Magna, Utah.
Molybdenum and Tantalum have unique properties that make the refractory metals very attractive for use in today's advanced process technologies.
COLUMBIA — The MU Research Reactor Center is aiming to add another distinction to its name: first domestic producer of Molybdenum-99.
Molybdenum and Tantalum have unique properties that make the refractory metals very attractive for use in today's advanced process technologies.
A deal for US Energy Corp. To scrap its plans to mine molybdenum near Crested Butte appears stalled.
Lantheus Extends NTP Radioisotopes Contract to Ensure Supply of LEU-Produced Molybdenum-99.
Revision of F2066 - 11 Standard Specification for Wrought Titanium-15 Molybdenum Alloy for Surgical Implant Applications (UNS R58150).

In science:

In 1971, Chevrel and co-workers discovered a new class of ternary molybdenum sulfides, having the general chemical formula MxMo6 S8 , where M stands for a large number of metals and rare earths (nearly 40), and x = 1 or 2.
Route to Room-Temperature Superconductivity from a Practical Point of View
They were using the graphite substrate as a template for growing molybdenum wires.
Multi-shell gold nanowires under compression
The simulation presented here shows that multi-shell gold nanowires after large deformations recover their cylindrical forms, as well as initial radii and lenghts. A similar result (i.e, that large bending deformations without breaking are possible) was recently obtained experimentally for molybdenum nanowires .
Multi-shell gold nanowires under compression
The active ring of the pendulum is molybdenum and has 44 holes.
Sub-mm tests of the gravitational inverse-square law
The two attractor disks are also made from molybdenum.
Sub-mm tests of the gravitational inverse-square law