Sodium telluride is the chemical compound with the formula Na₂Te. This salt is the conjugate base of the thermally unstable acid hydrogen telluride, but it is usually prepared by reduction of tellurium with sodium.
Chemical formula：Na₂Te
Molecular Weight: 205.81 g/mol
Appearance: Sodium telluride is usually a dark solid, appearing as black or dark gray crystalline powder.
Structure: Sodium telluride typically exists in a crystalline form and is composed of sodium cations (Na⁺) and telluride anions (Te²⁻).
Density: Approximately 3.3 g/cm³ (can vary depending on crystal structure).
Melting Point: Sodium telluride has a high melting point around 1,500°C (2,732°F).
Solubility: Insoluble in water, but reacts with water to release hydrogen gas and form sodium hydroxide (NaOH) and tellurium.
Semiconductor Industry: Na₂Te is used as a precursor for the synthesis of various tellurium-based semiconductors, which are valuable in thermoelectric and optoelectronic devices.
Thermoelectric Materials: Due to its semiconductor properties, sodium telluride is sometimes used in the development of thermoelectric materials for energy conversion applications.
Synthesis of Other Tellurides: It is used as a precursor to other tellurium-containing compounds and alloys, such as tellurium dioxide (TeO₂) or tellurium-based glass.
Handling: Na₂Te should be handled with extreme caution, as it is highly reactive, particularly in the presence of water or moisture. Protective equipment, including gloves, goggles, and a fume hood, is recommended when working with this compound.
Storage: Store sodium telluride in tightly sealed containers in a dry, cool place. Avoid exposure to moisture or humidity to prevent degradation or reaction with water. Containers should be made of materials that do not react with the compound.
Safety Considerations:Hazardous Reaction with Water: When exposed to moisture, sodium telluride reacts violently, releasing hydrogen gas and producing sodium hydroxide, which is caustic. This reaction can be hazardous.
Toxicity: Na₂Te itself is not highly toxic, but tellurium compounds can be toxic if ingested or inhaled. Proper precautions should be taken to avoid exposure to dust or fumes.
Handling Precautions: Given its reactivity and the potential for toxic fumes, Na₂Te should be handled in well-ventilated areas, away from sources of moisture or acidic substances.
Reactivity: Sodium telluride’s high reactivity with moisture and acids makes it potentially dangerous to the environment if improperly disposed of. The formation of toxic tellurium compounds should be carefully managed.
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