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| CAS No.: | 7446-07-3 |
|---|---|
| Name: | Tellurium dioxide |
| Molecular Structure: | |
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| Formula: | TeO2 |
| Molecular Weight: | 159.599 |
| Synonyms: | Telluria;Tellurium(IV) oxide;Tellurium oxide (TeO2); |
| EINECS: | 231-193-1 |
| Density: | 5.67g/mLat 25°C(lit.) |
| Melting Point: | 733 °C(lit.) |
| Boiling Point: | 1245 °C |
| Solubility: | insoluble in water |
| Appearance: | white crystalline powder |
| Safety: | 24/25 |
| Transport Information: | UN 3284 6.1/PG 3 |
| PSA: | 34.14000 |
| LogP: | -0.61840 |
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| Conditions | Yield |
|---|---|
| In neat (no solvent) byproducts: NOCl; reaction of TeCl2 with liquid N2O4;; | 100% |
- 7446-07-3
tellurium(IV) oxide
| Conditions | Yield |
|---|---|
| With air In neat (no solvent) heating in air above 430°C; at 630.degree C complete conversion;; | 100% |
- 7446-07-3
tellurium(IV) oxide
| Conditions | Yield |
|---|---|
| In hydrogenchloride Electrochem. Process; anodic dissolution of Te in 6n HCl in a cell with ceramic diaphragma, neutralisation with aq. NH3;; pure;; | 98% |
| In hydrogenchloride byproducts: H6TeO6; Electrolysis; electrolysis in HCl acidic soln. at 25 °C with a Te-anode;; | |
| With calcium oxide In neat (no solvent) byproducts: CaTeO3, Ca3TeO6; oxidation of Te in air in presence of CaO at 100-800°C;; |
| Conditions | Yield |
|---|---|
| In melt Te and KNO3 were molten for 2 h at 400-430 °C (molar ratio 1/2-2.5), the melt was dissolved in aq. KOH(10%) forming K2TeO3 which was treated with HNO3;; | 97.5% |
| Conditions | Yield |
|---|---|
| In melt Te and NaNO3 were molten for 2 h at 400-430 °C (molar ratio 1/2-2.5), the melt was dissolved in aq. KOH(10%) forming K2TeO3 which was treated with HNO3;; | 97.5% |
| Conditions | Yield |
|---|---|
| In melt byproducts: BaTeO3, Ba3TeO6; melting of a mixture of Te and anhydrous Ba(NO3)2 (in 10% excess) at temp. between 400 and 550°C; oxidation of Te starts at 345-400°C, at 650°C 65% TeO2 was formed;; | 65% |
| Conditions | Yield |
|---|---|
| In water molar ratio Ba:Cu:Te=1:2:2, excess 2 M aq. NH4Cl, sealed silica tube, 375°C, 5 d; collection (filtration), washing (water, Me2CO), hand sepn.; | A n/a B n/a C 30% |
- 7446-07-3
tellurium(IV) oxide
| Conditions | Yield |
|---|---|
| With sulfur In neat (no solvent) reduction with S;; |
- 7446-07-3
tellurium(IV) oxide
| Conditions | Yield |
|---|---|
| With air In neat (no solvent) byproducts: CeO2; CeTe was heated in air;; | |
| In neat (no solvent) |
| Conditions | Yield |
|---|---|
| In neat (no solvent) byproducts: Ce(OH)3; Te was heated in a stream of H2O vapor with ignition;; | |
| In neat (no solvent) |
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Consensus Reports
Reported in EPA TSCA Inventory.
Standards and Recommendations
OSHA PEL: TWA 0.1 mg(Te)/m3
ACGIH TLV: TWA 0.1 mg(Te)/m3
Specification
The Tellurium dioxide is an organic compound with the formula TeO2. The IUPAC name of this chemical is tellurium dioxide. With the CAS registry number 7446-07-3, it is also named as tellane, oxo-, oxide. The product's categories are Inorganics; Metal and Ceramic Science; Oxides; Tellurium. Besides, it is a white crystalline powder, which can be used as an acousto-optic material and a conditional glass former. Tellurite glasses have high refractive indices and also have been shown to exhibit Raman gain up to 30 times that of silica, useful in optical fibre amplification. When you are using it, avoid contact with skin and eyes.
Physical properties about Tellurium dioxide are: (1)#H bond acceptors: 2; (2)Polar Surface Area: 34.14 Å2.
Preparation: this chemical is produced by reacting tellurium with O2: Te + O2 → TeO2
It can also be prepared by dehydrating tellurous acid or thermally decomposing basic tellurium nitrate above 400°C.
You can still convert the following datas into molecular structure:
(1)SMILES: O=[Te]=O
(2)InChI: InChI=1/O2Te/c1-3-2
(3)InChIKey: LAJZODKXOMJMPK-UHFFFAOYAO
(4)Std. InChI: InChI=1S/O2Te/c1-3-2
(5)Std. InChIKey: LAJZODKXOMJMPK-UHFFFAOYSA-N
The toxicity data is as follows:
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| rabbit | LDLo | unreported | 324mg/kg (324mg/kg) | Scottish Medical and Surgical Journal. Vol. 26, Pg. 131, 1826. | |
| rat | LD50 | oral | > 5gm/kg (5000mg/kg) | GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA" | TNO-report. Vol. TNO-96-514, |
| rat | LDLo | intratracheal | 80mg/kg (80mg/kg) | LUNGS, THORAX, OR RESPIRATION: DYSPNEA KIDNEY, URETER, AND BLADDER: OTHER CHANGES GASTROINTESTINAL: OTHER CHANGES | American Industrial Hygiene Association Journal. Vol. 39, Pg. 100, 1978. |