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Send EmailTellurium Oxide, Tellurium Dioxide, Telluric Anhydride, 7446-07-3
| Parameter | Information |
|---|---|
| Product Name | Tellurium Dioxide |
| Chemical Name | Tellurium(IV) Oxide, Telluric Anhydride |
| Other Names | Tellurium Oxide, Tellurium Dioxide, Paratellurite (crystal form) |
| CAS Number | 7446-07-3 |
| EC Number (EINECS) | 231-193-3 |
| Chemical Formula | TeO₂ |
| Molecular Weight | 159.60 g/mol |
| Appearance | White crystalline powder |
| Odor | Odorless |
| Physical State (20°C) | Solid (crystalline powder) |
Tellurium dioxide is the most common oxide of tellurium. The compound consists of tellurium atoms in the +4 oxidation state bonded to oxygen atoms. It exhibits amphoteric behavior and can exist in two crystalline polymorphs: tetragonal (paratellurite) and orthorhombic (tellurite). The tetragonal form is the most stable and widely used for optical applications.
Tellurium Oxides Comparison:
| Oxide | Formula | Appearance | Melting Point | Properties | Main Uses | CAS No. |
|---|---|---|---|---|---|---|
| Tellurium monoxide | TeO | Gray-black solid | - | Basic oxide | Rare, precursor in synthesis | 12033-34-0 |
| Tellurium dioxide | TeO₂ | White crystalline solid | 733°C | Amphoteric, insoluble in water, soluble in NaOH | Semiconductors, ceramics, glass, catalysts | 7446-07-3 |
| Tellurium trioxide | TeO₃ | Yellow-orange crystals | - | Acidic oxide, strong oxidant | Specialty chemical synthesis | 13451-18-8 |
| Tellurium pentoxide | Te₂O₅ | - | - | Acidic oxide | Limited, research-grade | 13598-59-5 |
| Parameter | Tetragonal (Paratellurite) | Orthorhombic (Tellurite) |
|---|---|---|
| Crystal System | Tetragonal | Orthorhombic |
| Space Group | P4₁2₁2 (No. 92) | Pbca (No. 61) |
| Density | 5.67 g/cm³ | 5.67 g/cm³ |
| Refractive Index | 2.24 – 2.35 | 2.24 – 2.35 |
| Optical Activity | Optically active (chiral) | Not optically active |
| Stability | Most stable form | Less common |
| Property | Value | Description |
|---|---|---|
| Appearance | White crystalline powder | - |
| Odor | Odorless | - |
| Chemical Formula | TeO₂ | - |
| Molecular Weight | 159.60 g/mol | - |
| Density (20°C) | 5.67 g/cm³ | - |
| Melting Point | 733 °C | - |
| Boiling Point | 1,245 °C | - |
| Solubility in Water | Insoluble | - |
| Solubility in Alkalis | Soluble (forms tellurites) | - |
| Solubility in Acids | Slightly soluble in strong acids | - |
| pH (1% solution) | Amphoteric | - |
| Crystal Structure | Tetragonal (paratellurite) | - |
| Refractive Index | 2.24 – 2.35 | - |
| Vapor Pressure | Negligible | - |
| Tellurium Content | 79.9% Te | - |
| Oxygen Content | 20.1% O | - |
Reaction with Alkalis:
TeO₂ + 2NaOH → Na₂TeO₃ + H₂O
Reaction with Concentrated Acids:
TeO₂ + 4HCl → TeCl₄ + 2H₂O
Reduction to Elemental Tellurium:
TeO₂ + 2H₂ → Te + 2H₂O
Oxidation to Tellurium Trioxide:
2TeO₂ + O₂ → 2TeO₃ (at elevated temperatures)
| Parameter | Technical Grade | High Purity Grade | Optical Grade |
|---|---|---|---|
| Purity (TeO₂) | ≥ 99.0% | ≥ 99.9% | ≥ 99.99% |
| Tellurium (Te) Content | ~79.9% | ~79.9% | ~79.9% |
| Appearance | White to off-white powder | White powder | White powder |
| Insoluble in HCl | ≤ 0.1% | ≤ 0.01% | ≤ 0.001% |
| Chloride (Cl) | ≤ 0.01% | ≤ 0.001% | ≤ 0.0005% |
| Sulfate (SO₄) | ≤ 0.01% | ≤ 0.001% | ≤ 0.0005% |
| Iron (Fe) | ≤ 0.005% | ≤ 0.0005% | ≤ 0.0001% |
| Heavy Metals (as Pb) | ≤ 0.005% | ≤ 0.0005% | ≤ 0.0001% |
| Loss on Ignition | ≤ 0.5% | ≤ 0.1% | ≤ 0.05% |
| Application | Function | Details |
|---|---|---|
| Acousto-Optic Devices | Bragg cells, modulators, deflectors | Paratellurite form (TeO₂) for high efficiency |
| Optical Modulators | High-performance optical switching | Superior acousto-optic figure of merit |
| Semiconductor Components | Substrates and thin films | Tellurium-based semiconductors |
| Infrared Optics | Infrared windows and lenses | Transparent in IR region |
| Nonlinear Optical Materials | Frequency doubling and mixing | High nonlinearity |
| Application | Function | Details |
|---|---|---|
| Glass Coloring | Yellow to amber colors | Provides distinctive yellow-amber hues |
| Glass Stabilization | Chemical durability | Improves resistance to chemical attack |
| Ceramic Glazes | Yellow pigment | Used in glazes and enamels |
| Specialty Glass | Tellurite glass for IR transmission | Optical and communication applications |
| Application | Function | Details |
|---|---|---|
| Oxidation Catalysts | Selective oxidation | Catalyzes oxidation reactions |
| Organic Synthesis | Catalyst | Various organic transformations |
| Ammoxidation | Catalyst | Propylene to acrylonitrile |
| Dehydrogenation | Catalyst | Dehydrogenation reactions |
| Application | Function | Details |
|---|---|---|
| Specialty Alloys | Additive | Copper, lead, and steel alloys |
| Tellurium Metal Production | Precursor | Reduction to elemental tellurium |
| Cast Iron | Machinability enhancer | Improves machinability of cast iron |
| Application | Function | Details |
|---|---|---|
| Glass Polishing | Fine abrasive | Optical glass finishing |
| Chemical Reagent | Laboratory analytical reagent | Various chemical applications |
| Surface Treatment | Conversion coatings | Metal surface treatments |
| Sector | Suitability | Description |
|---|---|---|
| Electronics and Optics | Suitable | Acousto-optic devices, semiconductors, IR optics |
| Glass and Ceramics | Suitable | Coloring, stabilization, specialty glass |
| Catalysis | Suitable | Oxidation catalysts, organic synthesis |
| Metallurgy | Suitable | Specialty alloys, cast iron |
| Cosmetics | Not suitable | Toxic material |
| Food and Pharmaceutical | Not suitable | Not approved (toxic) |
| Textile | Not suitable | No application |
| Parameter | Value |
|---|---|
| Acute Oral Toxicity (LD50, Rat) | ~500 mg/kg (toxic) |
| Acute Inhalation Toxicity | Toxic |
| Skin Irritation | Mild irritant |
| Eye Irritation | Mild to moderate irritant |
| Inhalation | May cause respiratory irritation; characteristic garlic-like odor |
| Carcinogenicity | Not classified as a carcinogen |
| Mutagenicity | Limited data |
| Chronic Effects | May cause liver, kidney, and neurological effects |
| Environmental Hazards | Toxic to aquatic life with long-lasting effects (H411) |
| Target Organs | Liver, kidneys, respiratory system |
| Hazard Class | Category | H-Statement |
|---|---|---|
| Acute Toxicity (Oral) | Category 4 | H302: Harmful if swallowed |
| Acute Toxicity (Inhalation) | Category 4 | H332: Harmful if inhaled |
| Specific Target Organ Toxicity | Category 3 | H335: May cause respiratory irritation |
| Chronic Aquatic Toxicity | Category 2 | H411: Toxic to aquatic life with long-lasting effects |
Signal Word: WARNING
Hazard Pictograms: GHS07 (Exclamation Mark), GHS09 (Environment)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust |
| P264 | Wash hands thoroughly after handling |
| P270 | Do not eat, drink or smoke when using this product |
| P271 | Use only in well-ventilated areas |
| P273 | Avoid release to the environment |
| P280 | Wear protective gloves/eye protection/face protection |
| P301+P312 | IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell |
| P302+P352 | IF ON SKIN: Wash with plenty of soap and water |
| P304+P340 | IF INHALED: Remove person to fresh air and keep comfortable for breathing |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present |
| P312 | Call a POISON CENTER/doctor if you feel unwell |
| P337+P313 | If eye irritation persists: Get medical advice/attention |
| P391 | Collect spillage |
| P501 | Dispose of contents/container in accordance with local regulations |
| Route of Exposure | Action to Be Taken |
|---|---|
| Inhalation | Move to fresh air. If respiratory irritation persists, seek medical attention |
| Skin Contact | Wash with plenty of soap and water. Remove contaminated clothing |
| Eye Contact | Rinse immediately with plenty of water for at least 15 minutes. Seek medical attention |
| Ingestion | Do not induce vomiting. Rinse mouth. Drink water. Seek immediate medical attention |
| Note | Show this safety data sheet to the attending physician |
| Parameter | Condition |
|---|---|
| Storage Conditions | Store in a cool, dry, well-ventilated area |
| Container Requirements | Tightly closed, moisture-proof containers (HDPE, lined fiber drums) |
| Materials to Protect From | Moisture, strong reducing agents, strong acids |
| Shelf Life | 24-36 months in unopened original packaging under proper storage |
| Hygroscopicity | Low (insoluble in water, but may absorb surface moisture) |
| Incompatible Materials | Strong reducing agents, strong acids |
| Packaging Type | Quantity | Material |
|---|---|---|
| Fiber Drum | 25 kg | PE-lined, moisture-proof |
| Fiber Drum | 100 kg | PE-lined, moisture-proof |
| FIBC / Big-Bag | 500 kg | PE-lined, moisture-proof |
| Small Containers | 1 kg, 5 kg, 10 kg | HDPE containers |
| Parameter | Information |
|---|---|
| UN Number | Not specifically listed (check current regulations) |
| Hazard Class | 9 (Environmentally hazardous) |
| Packing Group | III |
| ADR/RID | Regulated (environmentally hazardous substance) |
| IMDG | Regulated (marine pollutant) |
| IATA | Regulated |
| Region / Authority | Status |
|---|---|
| European Union (REACH) | Registered |
| Turkey (KKDIK) | Compliance required |
| TSCA (USA) | Registered |
| EINECS | 231-193-3 |
| Food / Cosmetics | Not approved |
Tellurium(IV) Oxide
Telluric Anhydride
Tellurium Oxide
Tellurium Dioxide
Paratellurite (crystal form)
TeO₂
| Property | Value |
|---|---|
| CAS Number | 7446-07-3 |
| EC Number | 231-193-3 |
| Chemical Formula | TeO₂ |
| Molecular Weight | 159.60 g/mol |
| Appearance | White crystalline powder |
| Density (20°C) | 5.67 g/cm³ |
| Melting Point | 733 °C |
| Boiling Point | 1,245 °C |
| Tellurium Content | 79.9% |
| Solubility in Water | Insoluble |
| Solubility in Alkalis | Soluble |
| Crystal Structure | Tetragonal (paratellurite) |
| Refractive Index | 2.24 – 2.35 |
| GHS Signal Word | WARNING |
| UN Number | Not specifically listed |
Toxicity: Tellurium dioxide is toxic. Harmful if swallowed or inhaled (H302, H332). Use appropriate personal protective equipment.
Garlic Breath: Exposure may cause characteristic garlic-like odor on the breath, a classic symptom of tellurium exposure.
Environmental Hazard: Toxic to aquatic life with long-lasting effects (H411). Prevent release into the environment.
Amphoteric Nature: Reacts with both acids and bases. Handle with appropriate care.
Incompatibility: Incompatible with strong reducing agents and strong acids.
Respiratory Protection: Use dust mask (N95) when handling powder.
Optical Grade: High purity (≥ 99.99%) required for optical applications.
Storage:
Store in a cool, dry, well-ventilated area
Use tightly closed, moisture-proof containers
Keep away from strong reducing agents and acids
Store at room temperature (15-25°C)
Handling:
Use in well-ventilated areas
Use dust mask (N95), protective goggles, and gloves
Avoid dust formation
Wash hands after handling
Do not eat, drink or smoke when handling
Waste Management:
Dispose in accordance with local regulations
Do not discharge into water bodies
Collect spillage (P391)
This Technical Data Sheet (TDS) is for informational purposes only and is prepared based on available technical data. The user is solely responsible for determining the suitability of the product for their specific application and for complying with all local, national, and international regulations. For complete safety, storage, handling, transport, waste, and regulatory compliance information, the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier must be consulted. This document does not substitute professional advice. Tellurium dioxide is a toxic material; appropriate precautions must be taken during handling.