Tellurium powder - Materials / Alfa Chemistry

NAVIGATION

Tellurium powder

PRICE INQUIRY

Catalog Number

ACMA00021117

Product Name

Tellurium powder

Category

Description

Grayish-white, lustrous, brittle, crystalline solid; dark-gray to brown, amorphous powder with metallic characteristics. Used as a coloring agent in chinaware, porcelains, enamels, glass; producing black finish on silverware; semiconductor devices and research; manufacturing special alloys of marked electrical resistance. Improves mechanical properties of lead; powerful carbide stabilizer in cast iron, tellurium vapor in "daylight" lamps, vulcanization of rubber. Blasting caps. Semiconductor research. (EPA, 1998);DARK GREY-TO-BROWN AMORPHOUS POWDER, WITH METAL CHARACTERISTICS OR SILVERY-WHITE, LUSTROUS CRYSTALLINE SOLID.;Odorless, dark-gray to brown, amorphous powder or grayish-white, brittle solid.;Odorless, dark-gray to brown, amorphous powder or grayish-white, brittle solid.

IUPAC Name

tellurium

Molecular Weight

127.6g/mol

Molecular Formula

InChI

InChI=1S/Te

InChI Key

PORWMNRCUJJQNO-UHFFFAOYSA-N

Melting Point

842 °F (EPA, 1998);449.8 °C;449.5 °C;842°F;842°F

Density

6.24 (EPA, 1998);6.11-6.27;6.0-6.25 g/cm³;6.24;6.24

Solubility

Insoluble (NIOSH, 2016);Insol in benzene, carbon disulfide;INSOL IN HOT & COLD WATER, HYDROCHLORIC ACID; SOL IN NITRIC ACID, AQ REGIA, POTASSIUM CYANIDE, POTASSIUM HYDROXIDE, SULFURIC ACID;Solubility in water: none;Insoluble

Appearance

127.6

Application

Tellurium powder serves multiple purposes due to its unique properties as a crystalline, semimetallic element. Known for its grayish-silvery appearance and lustrous nature, tellurium can exist as either a hexagonal crystal or an amorphous powder. Its significance lies in its conductivity, which is especially sensitive to light exposure, making it a valuable p-type semiconductor. Widely used in the metallurgy field, tellurium enhances the properties of copper, tin, lead-based alloys, steel, and cast iron. Additionally, it finds applications in the electronics industry, particularly in the production of lasers and photoreceptors. Tellurium powder contributes to rubber manufacturing by increasing heat resistance and delaying aging in rubber hoses and cable coatings. In the arts, it functions as a coloring agent for chinaware, porcelain, enamels, and glass. Furthermore, it's employed as a reagent for producing a black finish on silverware and in the manufacturing of special alloys with marked electrical resistance. Despite its industrial applications, tellurium is not utilized in nutritional supplements as it is not a required micronutrient. As one of the rarer elements on Earth, tellurium is more often found as a byproduct in ore refining processes, providing a critical role across various industries.

Color/Form

Grayish-white, lustrous, brittle, crystalline solid, hexagonal, rhombohedral structure;Dark-gray to brown, amorphous powder with metal characteristics

Complexity

Component

powder

Composition

When heated to decomposition it emits toxic fumes of /tellurium/.

Compound Is Canonicalized

Yes

Covalently-Bonded Unit Count

Defined Atom Stereocenter Count

Defined Bond Stereocenter Count

Deprecated CAS

137322-20-4

EC Number

236-813-4

Exact Mass

129.9062227g/mol

Formal Charge

Heat of Vaporization

46.0 kJ/g

Heavy Atom Count

Hydrogen Bond Acceptor Count

Hydrogen Bond Donor Count

ICSC Number

0986

Isotope Atom Count

MeSH Entry Terms

Tellurium

Monoisotopic Mass

129.9062227g/mol

Odor

Odorless.

Other Experimental

Vapor pressure between 511 and 835 °C is given by equation logP(kPa)= 6.7249-(5960.2/K);Diatomic in vapor state; atomic number 52, valence 2, 4, 6; in air dissolves in potassium hydroxide; electrical resistivity at 19.6 °C: 200,000 micro-ohms/cm; reacts with nitric acid, not with hydrochloric acid; linear coefficient of thermal expansion: 16.8X10-6/deg C; latent heat of fusion: 4.27 kcal/mol; hardness (Mohs): 2.3; magnetic susceptibility at 18 °C: -0.31X10-6 cgs; specific heat (solid): 0.047 cal/g/deg C;TELLURIUM BURNS IN AIR WITH A GREENISH-BLUE FLAME TO FORM TELLURIUM DIOXIDE;Combines with halogens, does not react with sulfur or selenium; modulus of elasticity: 6000000 psi. ... Eight stable isotopes: 120, 122, 123, 124, 125, 126, 128, 130; reacts with concentrated or fuming sulfuric acid

Refractive Index

INDEX OF REFRACTION: 1.0025; SADTLER REFERENCE NUMBER: 5272 (IR, PRISM)

Rotatable Bond Count

RTECS Number

WY2625000

Specific Surface Area

100-400 mesh

Stability

TARNISHES SLIGHTLY IN AIR

Topological Polar Surface Area

0Å²

Undefined Atom Stereocenter Count