ChemicalBook Produktkatalog Anorganische Chemieindustrie Anorganische Salze Oxide der Seltenerden, Yttrium und Scandium Tellurdioxid

Tellurium dioxide Struktur

Tellurdioxid

Bezeichnung:Tellurdioxid

CAS-Nr7446-07-3

Englisch Name:Tellurium dioxide

CBNumberCB1670143

SummenformelO2Te

Molgewicht159.6

MOL-Datei7446-07-3.mol

Synonyma

Tellurdioxid

Tellurdioxid physikalisch-chemischer Eigenschaften

Schmelzpunkt

733 °C (lit.)

Siedepunkt

1245 °C

Dichte

5.67 g/mL at 25 °C (lit.)

Dampfdruck

0Pa at 25℃

storage temp.

no restrictions.

Löslichkeit

insoluble in H2O; soluble in alkaline solutions, acid solutions

Aggregatzustand

Powder

Wichte

5.8

Farbe

White to slightly yellow

Wasserlöslichkeit

insoluble

maximale Wellenlänge (λmax)

360nm(neat)(lit.)

Merck

14,9123

crystal system

square

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

Expositionsgrenzwerte

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

Stabilität

Stable. Incompatible with strong acids, strong oxidizing agents.

CAS Datenbank

7446-07-3(CAS DataBase Reference)

Sicherheit

S-Sätze:	24/25
RIDADR	UN 3284 6.1/PG 3
WGK Germany	2
RTECS-Nr.	WY2675000
TSCA	Yes
HazardClass	6.1(a)
PackingGroup	II
HS Code	28112900
Toxizität	LD50 orally in Rabbit: > 2000 mg/kg

Gefahreninformationscode (GHS)

Tellurium dioxide Chemische Eigenschaften,Einsatz,Produktion Methoden

S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
Heavy, white, crystalline powder; odorless. Soluble in concentrated acids, alkalies; slightly soluble in dilute acids, water.
Physikalische Eigenschaften
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.
Verwenden
TeO₂ can be potentially used in medical imaging and industrial monitoring processes.
Verwenden
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.
Verwenden
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.
Vorbereitung Methode
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.
Allgemeine Beschreibung
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
Sicherheitsprofil
Poison by intratracheal route. An experimental teratogen. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of Te. See also TELLURIUM COMPOUNDS.
läuterung methode
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 Upstream-Materialien And Downstream Produkte

Tellurdioxid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7446-07-3, Tellurium dioxide Verwandte Suche:

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