ChemicalBook CAS DataBase List 7446-07-3

7446-07-3

Name	Tellurium dioxide
CAS	7446-07-3
EINECS(EC#)	231-193-1
Molecular Formula	O2Te
MDL Number	MFCD00011263
Molecular Weight	159.6
MOL File	7446-07-3.mol

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

Chemical Properties

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.)

crystal system

square

Merck

14,9123

Space group

P41212

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.48122	0.48122	0.76157	90	90	90	0.1764

Exposure limits

ACGIH: TWA 0.1 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3

InChI

1S/O2Te/c1-3-2

Safety Data

Symbol(GHS)	GHS07,GHS08,GHS09
Signal word	Danger
Hazard statements	H317-H332-H360D-H411
Precautionary statements	P202-P273-P280-P302+P352-P304+P340+P312-P308+P313
Safety Statements	S24/25:Avoid contact with skin and eyes . less more
RIDADR	UN 3284 6.1/PG 3
WGK Germany	2
RTECS	WY2675000
TSCA	Yes
REACH Registrations	Active
HazardClass	6.1(a)
PackingGroup	II
HS Code	28112900
Storage Class	6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects
Hazard Classifications	Acute Tox. 4 Inhalation Aquatic Chronic 2 Lact. Repr. 1B Skin Sens. 1B
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. less more
Toxicity	LD50 orally in Rabbit: > 2000 mg/kg less more

Hazard Information

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].

Material Safety Data Sheet(MSDS)

Spectrum Detail

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