Tellurium dioxide
- CAS No.
- 7446-07-3
- Chemical Name:
- Tellurium dioxide
- Synonyms
- TeO2;TelluriumDiox;TELLERIUM OXIDE;Tellurium dioxide;TELLURIUM(+4)OXIDE;TELLURIUM(IV) OXIDE;Tellurous anhydride;telluriumoxide(teo2);Tellurium(IV)dioxide;Tellurium oxide, 99%+
- CBNumber:
- CB1670143
- Molecular Formula:
- O2Te
- Molecular Weight:
- 159.6
- MOL File:
- 7446-07-3.mol
- MSDS File:
- SDS
- Modify Date:
- 2024/4/25 13:42:50
| 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 |
| 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 |
| Stability | Stable. Incompatible with strong acids, strong oxidizing agents. |
| CAS DataBase Reference | 7446-07-3(CAS DataBase Reference) |
| NIST Chemistry Reference | tellurium(IV) dioxide(7446-07-3) |
| EPA Substance Registry System | Tellurium oxide (TeO2) (7446-07-3) |
SAFETY
Risk and Safety Statements
| 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 | 24/25 | |||||||||
| RIDADR | UN 3284 6.1/PG 3 | |||||||||
| WGK Germany | 2 | |||||||||
| RTECS | WY2675000 | |||||||||
| TSCA | Yes | |||||||||
| HazardClass | 6.1(a) | |||||||||
| PackingGroup | II | |||||||||
| HS Code | 28112900 | |||||||||
| Toxicity | LD50 orally in Rabbit: > 2000 mg/kg | |||||||||
| NFPA 704 |
|
Tellurium dioxide price More Price(31)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | 86370 | Tellurium dioxide ≥97.0% | 7446-07-3 | 50G | ₹10207.98 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 86370 | Tellurium dioxide ≥97.0% | 7446-07-3 | 250G | ₹39662.8 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 243450 | Tellurium dioxide ≥99% | 7446-07-3 | 50G | ₹9160 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 243450 | Tellurium dioxide ≥99% | 7446-07-3 | 250G | ₹35240 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 204552 | Tellurium dioxide 99.995% trace metals basis | 7446-07-3 | 10G | ₹6527.48 | 2022-06-14 | Buy |
Tellurium dioxide Chemical Properties,Uses,Production
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.
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.
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.
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.
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].
Tellurium dioxide Preparation Products And Raw materials
Raw materials
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| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| CHEMSWORTH | +91-261-2397244 | New Delhi, India | 6707 | 30 | Inquiry |
| TCI Chemicals (India) Pvt. Ltd. | 1800 425 7889 | New Delhi, India | 6778 | 58 | Inquiry |
| Otto Chemie Pvt. Ltd. | +91 9820041841 | Mumbai, India | 5873 | 58 | Inquiry |
| Sisco Research Laboratories Pvt. Ltd. | +91-22-4268 5800 | Mumbai, India | 4317 | 58 | Inquiry |
| Alfa Aesar | 1 800 209 7001 | Maharashtra, India | 6913 | 58 | Inquiry |
| Triveni chemicals | 08048762458 | New Delhi, India | 6093 | 58 | Inquiry |
| Snow White Products | 09820070100 | Mumbai, India | 5 | 58 | Inquiry |
| Zhuoer Chemical Co., Ltd | 02120970332; +8613524231522 | China | 3005 | 58 | Inquiry |
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| Hebei Guanlang Biotechnology Co,.LTD | +86-19930503253; +8619930503252 | China | 5911 | 58 | Inquiry |
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