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Tellurium dioxide

Tellurium dioxide structure

CAS No:
7446-07-3
Formula:
O2Te
Chemical Name:
Tellurium dioxide
Synonyms:
TELLURIUM(IV) OXIDE;TELLERIUM OXIDE;TELLURIUM(+4)OXIDE;telluriumoxide(teo2);Tellurous acid anhydride;TelluriuM(IV) oxide, 99.9995%, (trace Metal basis);TELLURIUM DIOXIDE 99.5+ 25 G;TELLURIUM DIOXIDE 99.5+ 10 G
Categories:
Organic Chemistry > Free Radicals

Description

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

Solid

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-TeO2and orthorhombic β-TeO2.

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

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 dioxide Basic Attributes

Molecular Weight：

159.6

Exact Mass：

161.89600

EC Number：

231-193-1

UNII：

397E9RKE83

NSC Number：

8956

TSCA：

TSCA listed

DSSTox ID：

DTXSID8052487

Color/Form：

White to slightly yellow

HScode：

28112900

Characteristics

λmax：

360nm(neat)(lit.)

PSA：

34.1

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.

XLogP3：

-0.61840

Appearance：

white crystalline powder

Density：

5.67 g/mL at 25 °C (lit.)

Melting Point：

733 °C (lit.)

Boiling Point：

1245 °C

Water Solubility：

insoluble

Storage Conditions：

Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Vapor Pressure：

0Pa at 25℃

Toxicity：

LD50 orally in Rabbit: > 2000 mg/kg

Flammability characteristics：

Non flammable

Critical Temperature & Pressure：

no restrictions.

Safety Information

Packing level：

Hazard category：

6.1(a)

Transport codes：

UN 3284 6.1/PG 3

wgk germany：

safety instructions：

24/25

RTECS Number：

WY2675000

Stability/Shelf Life：

Stable. Incompatible with strong acids, strong oxidizing agents.

Precautionary statement(s)：

P201, P202, P260, P281, P308+P313, P314, P405, P501

Hazard Statements：

H360

RIDADR：

UN 3284 6.1/PG 3

GHS Classification：

|Danger|H302 (61.11%): Harmful if swallowed [Warning Acute toxicity, oral]|P201, P202, P260, P261, P264, P270, P271, P272, P273, P280, P281, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P308+P313, P310, P312, P314, P321, P330, P332+P313, P333+P313, P337+P313, P362, P363, P391, P405, and P501|Aggregated GHS information provided by 69 companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H360: May damage fertility or the unborn child [Danger Reproductive toxicity]|P201, P202, P260, P281, P308+P313, P314, P405, and P501|Warning|H361: Suspected of damaging fertility or the unborn child [Warning Reproductive toxicity]

Toxicity

Human Exposure：

ACGIH: TWA 0.1 mg/m3NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3

Drug Information

MeSH Entry Terms：

tellurium dioxide

Tellurium dioxide Use and Manufacturing

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.

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.

TeO2can be potentially used in medical imaging and industrial monitoring processes.

Production

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 2TeO2HNO3. The product then is heated to drive off nitric acid.

Manufacturing Info：

Tellurium oxide (TeO2): ACTIVE

Computed Properties

Molecular Weight:159.6
Hydrogen Bond Acceptor Count:2
Exact Mass:161.8960520
Monoisotopic Mass:161.8960520
Topological Polar Surface Area:34.1
Heavy Atom Count:3
Complexity:18.3
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

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