| Identification | More | [Name]
Tellurium dioxide | [CAS]
7446-07-3 | [Synonyms]
TELLERIUM OXIDE
TELLURIUM(+4)OXIDE
TELLURIUM(IV) OXIDE
TELLURIUM OXIDE
Tellurium oxide (TeO2)
telluriumoxide(teo2)
Tellurous acid anhydride
TeO2
TELLURIUM DIOXIDE, 99.9995%
TELLURIUM DIOXIDE, 99+%
AMMONIUM CHLORIDE PURE
TELLURIUM DIOXIDE, RANDOM PIECES, OPTICAL GRADE
TELLURIUM(IV) OXIDE, 99.995%
Tellurium(IV) oxide, 99+%
Tellurium(IV)oxide,99.995%(metalsbasis)
Tellurium(IV)oxide,tech.
TelluriumDiox
TELLURIUM OXIDE, 99.5%
Tellurium(IV)oxide(99.9995%-Te)PURATREM
tellurium(iv) oxide, puratronic | [EINECS(EC#)]
231-193-1 | [Molecular Formula]
O2Te | [MDL Number]
MFCD00011263 | [Molecular Weight]
159.6 | [MOL File]
7446-07-3.mol |
| Chemical Properties | Back Directory | [Appearance]
white crystalline powder | [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 | [Stability:]
Stable. Incompatible with strong acids, strong oxidizing agents. | [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 | [CAS DataBase Reference]
7446-07-3(CAS DataBase Reference) | [NIST Chemistry Reference]
tellurium(IV) dioxide(7446-07-3) | [EPA Substance Registry System]
7446-07-3(EPA Substance) |
| Safety Data | Back Directory | [Safety Statements ]
S24/25:Avoid contact with skin and eyes . | [RIDADR ]
UN 3284 6.1/PG 3
| [WGK Germany ]
2
| [RTECS ]
WY2675000
| [TSCA ]
Yes | [HazardClass ]
6.1(a) | [PackingGroup ]
II | [HS Code ]
28112900 | [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. | [Toxicity]
LD50 orally in Rabbit: > 2000 mg/kg |
| Hazard Information | Back Directory | [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. | [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]
Nonflammable | [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]. |
| Questions and Answers (Q&A) | Back Directory | [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.
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