CAS 7440-33-7 Mechanical exfoliation WSe2 on sapphire substrate

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Mechanical exfoliation WSe2 on sapphire substrate

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Catalog Number

ACM7440337-12

Product Name

Mechanical exfoliation WSe2 on sapphire substrate

Structure

CAS

7440-33-7

Category

Metal

Description

Dull gray powder or hard, brittle, steel-gray to white metal. Difficult to melt. Mp: 3410°C; bp; 5900°C. Density: 19.3 g/cm³. Used in alloys, light bulb filaments, and cutting tools. Tungsten Dust (for example, from grinding) may present a moderate fire hazard if allowed to accumulate and exposed to an ignition source.;DryPowder; DryPowder, OtherSolid; OtherSolid;GREY-TO-WHITE POWDER.;Physical properties vary depending upon the specific soluble tungsten compound.;Hard, brittle, steel-gray to tin-white solid.

IUPAC Name

tungsten

Molecular Weight

183.8g/mol

Molecular Formula

Canonical SMILES

[W]

InChI

InChI=1S/W

InChI Key

WFKWXMTUELFFGS-UHFFFAOYSA-N

Boiling Point

10701 °F at 760 mm Hg (NIOSH, 2016);5900 °C @ 760 mm Hg;5900 °C;10,701°F

Melting Point

6170 °F (NIOSH, 2016);3410 °C;3410 °C;6170°F

Density

19.3 (NIOSH, 2016);18.7-19.3 @ 20 °C/4 °C; depends on extent of working.;19.3 g/cm³;19.3

Solubility

Insoluble (NIOSH, 2016);Sol in mixture of nitric acid and hydrofluoric acid;Solubility in water: none;Insoluble

Color/Form

Steel-gray to tin-white metal; body centered cubic structure;CRYSTALLINE FORM GRAY-BLACK, CUBIC;Hard, brittle, steel-gray to tin-white solid.

Complexity

Covalently-Bonded Unit Count

EC Number

231-143-9

Exact Mass

183.950933g/mol

Formal Charge

Heat of Vaporization

1150 cal/g

Heavy Atom Count

ICSC Number

1404

MeSH Entry Terms

Tungsten;Wolfram

Monoisotopic Mass

183.950933g/mol

Other Experimental

Very pure tungsten can be cut with hacksaw and forged, spun, drawn, and extruded; impure metal brittle, worked with difficulty;NOT AFFECTED BY SULFUR OR PHOSPHORUS; GOOD ELECTRICAL CONDUCTIVITY;VIGOROUS REACTION WITH BROMINE TRIFLUORIDE, CHLORINE TRIFLUORIDE; REACTION WITH FLUORINE MAY BE INCANDESCENT;Corroded by sea water.;Atomic number: 74; valences 6, 5, 4, 3, 2. Naturally occurring isotopes: 180 (0.135%); 182 (26.4%); 183 (14.4%); 184 (30.6%); 186 (28.4%).;Hardness: 6.5-7.5. Specific heat (20 °C): 0.032 cal/g/deg C; heat of fusion: 44 cal/g; electrical resistivity (20 °C) 5.5 uohm-cm.;Forms trioxide at red heat; not attacked by water; oxidized to dioxide by steam; very stable to acids, attacked only superficially by concn nitric acid or aqua regia; attacked by fluorine at room temp; by chlorine at 250-300 °C giving hexachloride in absence of air and trioxide and oxychloride in presence of air.;Powdered tungsten can be pyropohric under the right conditions. Slowly sol in fused potassium hydroxide in air, in fused sodium carbonate in air, and sol in fused mixture of sodium hydroxide and nitrate.

Rotatable Bond Count

RTECS Number

YO7175000

Size

10 mmx10 mm

Stability

STABLE IN DRY AIR @ ORDINARY TEMP;OXIDIZES IN AIR & MUST BE PROTECTED @ ELEVATED TEMP

UNII

V9306CXO6G

UN Number

3089;1325

Vapor Pressure