Listing description
Molybdenite is a mineral of molybdenum
disulfide, MoS2. Similar in
appearance and feel to graphite, molybdenite has a lubricating effect that is a consequence
of its layered structure.
Detailed description
The
atomic structure consists of a sheet of molybdenum atoms
sandwiched between sheets of sulfur atoms. The Mo-S
bonds are strong, but the interaction between the sulfur atoms at the top and
bottom of separate sandwich-like tri-layers is weak, resulting in easy slippage
as well as cleavage planes. Molybdenite crystallizes in the hexagonal
crystal system as the common polytype 2H and also in the trigonal system as the 3R polytype.
Uses
Molybdenite is an important ore of molybdenum, and
is the most common source of the metal.[3] While molybdenum is
rare in the Earth's crust, molybdenite is relatively common and easy to
process, and accounts for much of the metal's economic viability. Molybdenite
is purified by froth
floatation, and then oxidized to form soluble molybdate. Reduction of
ammonium molybdate yields pure molybdenum metal, which is used for fertilizer,
as a catalyst, and in battery electrodes. By far the most common use of
molybdenum is as an alloy with iron. Ferromolybdenum is an important
component of high strength and corrosion-resistant steel.
Semiconductor
Multilayer molybdenite flakes are semiconductors with an indirect bandgap.
In contrast, monolayer flakes have a direct gap.[7] In the early years
of the 20th century, molybdenite was used in some of the first crude semiconductor diodes, called cat's whisker detectors, which served as a demodulator in early crystal
radios. Monolayer molybdenite shows good charge
carrier mobility and can be used to
create small or low-voltage transistors.[8] The transistors can
detect and emit light and may have future use in optoelectronics.
PRICE
$14.78/KG OR
$6.71/IB
For more information:
mobile: +2348039721941
contact person: emeaba uche
e-mail: emeabau@yahoo.com
website: www.franchiseminerals.com
No comments:
Post a Comment