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HomeProduct name listTellurium dioxide

Tellurium dioxide

Synonym(s):Telluria;Tellurium dioxide;Tellurium oxide;Tellurium(IV) oxide

  • CAS NO.:7446-07-3
  • Empirical Formula: O2Te
  • Molecular Weight: 159.6
  • MDL number: MFCD00011263
  • EINECS: 231-193-1
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-11-13 18:13:23
Tellurium dioxide Structural

What is Tellurium dioxide?

Chemical properties

Heavy, white, crystalline powder; odorless. Soluble in concentrated acids, alkalies; slightly soluble in dilute acids, water.
Tellurium dioxide.jpg

Physical properties

White crystals; dimorphic; exists in tetragonal and orthorhombic forms; density 5.75 g/cm3 (tetragonal), 6.04 g/cm3 (orthorhombic); melts at 733°C forming a deep yellow liquid; vaporizes at 1,245°C; insoluble in water; soluble in acids and alkalies.

The Uses of Tellurium dioxide

Tellurium dioxide is also used in devices which can convert light into sound (acousto-optic material). Glasses made of tellurium oxide have high refractive indices and transmit into mid-IR region. It is used to make glasses with special properties. It is useful in optical waveguides and optical fiber amplification.

The Uses of Tellurium dioxide

Tellurium dioxide is used to prepare tellurium metal, telluric acid, and many tellurium salts. It may also be used in the preparation of Ag2Te nanoparticles.

The Uses of Tellurium dioxide

TeO2 can be potentially used in medical imaging and industrial monitoring processes.

Production Methods

Tellurium dioxide in its orthorhombic form occurs in nature as mineral tellurite. It is mined from natural deposits. Also, tellurium dioxide is produced as an intermediate during recovery of tellurium metal from anode slimes of electrolytic copper refining (See Tellurium, Production). The dioxide also is prepared by treating tellurium metal with hot nitric acid to form 2TeO2?HNO3. The product then is heated to drive off nitric acid.

General Description

Tellurium dioxide (TeO2) is a ceramic material that can be used as a semiconducting oxide. It has a wide band gap and high mobility as determined by density functional theory (DFT) calculations. In bulk quantity, it exists in two polymorphs which include tetragonal α-TeO2 and orthorhombic β-TeO2.

Flammability and Explosibility

Non flammable

Safety Profile

Poison by intratracheal route. An experimental teratogen. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.

Purification Methods

Dissolve it in 5M NaOH, filter it and precipitate it by adding 10M HNO3 to the filtrate until the solution is acid to phenolphthalein. After decanting the supernatant, the precipitate is washed five times with distilled water, then dried for 24hours at 110o [Horner & Leonhard J Am Chem Soc 74 3694 1952].

Properties of Tellurium dioxide

Melting point: 733 °C (lit.)
Boiling point: 1245 °C
Density  5.67 g/mL at 25 °C (lit.)
vapor pressure  0Pa at 25℃
storage temp.  no restrictions.
solubility  insoluble in H2O; soluble in alkaline solutions, acid solutions
form  Powder
color  White to slightly yellow
Specific Gravity 5.8
Water Solubility  insoluble
λmax 360nm(neat)(lit.)
Merck  14,9123
Exposure limits ACGIH: TWA 0.1 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3
Stability: Stable. Incompatible with strong acids, strong oxidizing agents.
CAS DataBase Reference 7446-07-3(CAS DataBase Reference)
NIST Chemistry Reference tellurium(IV) dioxide(7446-07-3)
EPA Substance Registry System Tellurium oxide (TeO2) (7446-07-3)

Safety information for Tellurium dioxide

Signal word Danger
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
ghs
Health Hazard
GHS08
ghs
Environment
GHS09
GHS Hazard Statements H317:Sensitisation, Skin
H332:Acute toxicity,inhalation
H411:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes P202:Do not handle until all safety precautions have been read and understood.
P273:Avoid release to the environment.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P308+P313:IF exposed or concerned: Get medical advice/attention.

Computed Descriptors for Tellurium dioxide

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