75 186.210
Re
Rhenium

Rhenium , Re

Rhenium is a chemical element with the symbol Re and atomic number 75. A silvery-white, rare, heavy, polyvalent transition metal, rhenium resembles manganese chemically and is used in some alloys. Rhenium is obtained as a by-product of molybdenum refinement and rhenium-molybdenum alloys are superconducting. It was the last naturally occurring element to be discovered and belongs to the ten most expensive metals on Earth (over US$ 7500.-/kg).

 

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R1-5003-M
Re 3-6mm Pieces 99.99% PureSuperVac© Rhenium
R1-10004-P
ReCl3 -80 mesh 99.9% PureRhenium Chloride
R1-10005-P
ReCl4 -80 mesh 99.9% PureRhenium Chloride
R1-10006-P
ReCl5 -80 mesh 99.9% PureRhenium Chloride
R1-10007-P
ReF6 disposable metal cylinder under pressure(m.p. 19ř, b.p. 48ř), 99.9%Rhenium Fluoride
R1-10009-P
Re2O7 -6 mesh 99.99% PureRhenium Oxide
R1-10010-P
ReO3 -100 mesh 99.95% PureRhenium Oxide
R1-10011-P
ReO2 -100 mesh 99.95% PureRhenium Oxide
R1-10012-P
ReSe2 -100 mesh 99.9% PureRhenium Selenide
R1-10014-P
ReS -80 mesh 99.9% PureRhenium Sulphide
R1-10015-P
ReTe2 -60 mesh 99.9% PureRhenium Telluride
R1-2000-R

Re Rod 1.58mm diameter 99.99% pure

Rhenium

R1-2001-R

Re Rod 3.18mm diameter 99.99% pure

Rhenium

R1-2002-R

Re Rod 6.35mm diameter 99.99% pure

Rhenium

R1-2003-R

Re Rod 12.7mm diameter 99.99% pure

Rhenium

R1-2004-R

Re Rod 15.88mm diameter 99.99% pure

Rhenium

R1-9000-D001
Rhenium Re, Purity 99.95% & 99.99%
R1-9002-D001
Rhenium-Molybdenum, Re-Mo, Available in various ratios wt% or at%, Purity 99.95%
RE-F-0.1

Re Foil Thickness 0.1mm (0.004") Purity 99.99%

Rhenium

RE-F-0.2

Re Foil Thickness 0.2mm (0.008") Purity 99.99%

Rhenium

RE-ST-2-3-3N5
Re TRG 50.8mm dia. x 3mm Tk 99.95% PureRhenium

Rhenium is a silvery white metal, lustrous, and has one of the highest melting points of all elements, exceeded by only tungsten and carbon. It is also one of the most dense, exceeded only by platinum, iridium and osmium. Rhenium has the widest range of oxidation states of any known element: -3, -1, 0, +1, +2, +3, +4, +5, +6 and +7. The oxidation states +7, +6, +4, +2 and -1 are the most common.

Its usual commercial form is a powder, but this element can be consolidated by pressing and resistance-sintering in a vacuum or hydrogen atmosphere. This procedure yields a compact shape that is in excess of 90 percent of the density of the metal. When annealed this metal is very ductile and can be bent, coiled, or rolled. Rhenium-molybdenum alloys are superconductive at 10 K; tungsten-rhenium alloys are also superconductive, around 4-8 K depending on the alloy. Rhenium metal superconducts at 2.4 K.

Symbol Re
Atomic number 75
No. of naturally occurring isotopes 2
Atomic weight 186.207
Electronic configuration [Xe]4f145d56s2
Metal radius(.12-coordinate)/pm 137
Ionic radius(6-coordinate)/pm VII 53
Ionic radius(6-coordinate)/pm VI 55
Ionic radius(6-coordinate)/pm V 58
Ionic radius(6-coordinate)/pm IV 63
Density (25°C)/gcm-3 21
Melting point/ °C 3180
Boiling point / °C -5650
ΔHfus/kJmol-1 34(+/-4)
ΔHvap/kJmol-1 704
ΔHf(monoatomic gas)/kJmol-1 779(+/-8)
Electrical resistivity (20°C)/μohm cm 19.3
Electronegativity χ 1.9
Temperature (oC) @Vap. Pressure
10-8 Torr 1928
10-6 Torr 2207
10-4 Torr 2571
Techniques
Electron Beam Poor
Crucible -
Coil -
Boat -
Remarks
Fine wire will self-evaporate