Basic information Safety Supplier Related
ChemicalBook >  Product Catalog >  Inorganic chemistry >  Inorganic salts >  Rare Earth Metals Oxides >  Tellurium dioxide

Tellurium dioxide

Basic information Safety Supplier Related

Tellurium dioxide Basic information

Product Name:
Tellurium dioxide
Synonyms:
  • TELLURIUM(IV) OXIDE
  • TELLERIUM OXIDE
  • TELLURIUM(+4)OXIDE
  • Tellurium oxide (TeO2)
  • telluriumoxide(teo2)
  • Tellurous acid anhydride
  • TeO2
  • TelluriuM(IV) oxide, 99.9995%, (trace Metal basis)
CAS:
7446-07-3
MF:
O2Te
MW:
159.6
EINECS:
231-193-1
Product Categories:
  • Metal and Ceramic Science
  • Oxides
  • Inorganics
  • Tellurium
  • metal oxide
Mol File:
7446-07-3.mol
More
Less

Tellurium dioxide Chemical Properties

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
crystal system
square
Space group
P41212
Lattice constant
a/nmb/nmc/nmα/oβ/oγ/oV/nm3
0.481220.481220.761579090900.1764
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)
More
Less

Safety Information

Safety Statements 
24/25
RIDADR 
UN 3284 6.1/PG 3
WGK Germany 
2
RTECS 
WY2675000
TSCA 
Yes
HazardClass 
6.1(a)
PackingGroup 
II
HS Code 
28112900
Toxicity
LD50 orally in Rabbit: > 2000 mg/kg

MSDS

More
Less

Tellurium dioxide Usage And Synthesis

Chemical Properties

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

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.

Uses

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.

Uses

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

Uses

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.

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].

Tellurium dioxideSupplier

J & K SCIENTIFIC LTD.
Tel
010-82848833 400-666-7788
Email
jkinfo@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
021-61259108 18621169109
Email
market03@meryer.com
INTATRADE GmbH
Tel
+49 3493/605464
Email
sales@intatrade.de
3B Pharmachem (Wuhan) International Co.,Ltd.
Tel
821-50328103-801 18930552037
Email
3bsc@sina.com
Alfa Aesar
Tel
400-6106006
Email
saleschina@alfa-asia.com