BISMUTH TELLURIDE Property

Melting point:

585 °C(lit.)

Boiling point:

1172 °C

Density 

7.642 g/mL at 25 °C(lit.)

solubility 

insoluble in H2O; soluble in ethanol

form 

Powder

color 

Gray

Water Solubility 

Insoluble in water.

Sensitive 

Moisture Sensitive

Crystal Structure

Cubic, Halite Structure - Space Group Fm3m

Exposure limits

ACGIH: TWA 10 mg/m3; TWA 5 mg/m3; TWA 0.1 mg/m3
OSHA: TWA 15 mg/m3; TWA 5 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 5 mg/m3; TWA 10 mg/m3; TWA 0.1 mg/m3

InChIKey

GUYIRKJSQUOSJV-UHFFFAOYSA-N

CAS DataBase Reference

1304-82-1(CAS DataBase Reference)

EPA Substance Registry System

Dibismuth tritelluride (1304-82-1)

Safety

Hazard Codes 

Xn

Risk Statements 

20/21/22-36/37/38

Safety Statements 

26-36

RIDADR 

UN 3284 6.1/PG 3

OEB

B

OEL

TWA: 10 mg/m3 (total)

WGK Germany 

3

RTECS 

EB3110000

TSCA 

Yes

HazardClass 

6.1

Hazardous Substances Data

1304-82-1(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

BISMUTH TELLURIDE Chemical Properties,Usage,Production

Description

Bismuth telluride is a gray crystalline solid.Molecular weight=800.83; Specific gravity (H2O:1)=7.7;Freezing/Melting point=573℃; Vapor pressure=0 mmHgat 20℃. Hazard Identification (based on NFPA-704 MRating System): Health 2, Flammability 2, Reactivity 2.Note: Commercial mix of doped bismuth tritelluride maycontain 80% Bi2Te3, 20% stannous telluride, plus some tellurium. Insoluble in water. Doped and undoped have similarphysical properties.

Chemical Properties

Bismuth telluride is a gray or black crystalline solid or gray powder.

Uses

Semiconductors; thermoelectric cooling; power generation application; for commercial use, Bi2Te3 is “doped” with selenium sulfide to alter its conductivity.

Uses

In electronics as semiconductor.

Uses

Bi2Te3, along with Sb2Te3 and other structurally analogous semiconductors, is widely regarded as one of the best materials for room-temperature thermoelectric devices. Bismuth(III) telluride is a key component of thermoelectric materials that have reached ZT values as high as 2.4 at room temperature.

General Description

Gray or black hexagonal platelets with a metallic luster or gray powder. Mp: 586°C. Density: 7.8 g cm-3. An alloy of two metallic elements.

Reactivity Profile

BISMUTH TELLURIDE may emit toxic fumes of tellurium when heated to decomposition. Incompatible with strong oxidizing agents such as nitric acid or bromine, chlorine or fluorine. Moderate fire hazard by reaction with such materials. May react with strong acids to evolve toxic gases; may react slowly with water to evolve toxic gases. Slight explosion hazard with moisture.

Hazard

Toxic.

Health Hazard

Bismuth telluride, either alone or doped with selenium sulfide, is apparently of very low toxicity.
In limited industrial experimental work with bismuth telluride under controlled conditions (vacuum hoods), no adverse health effects were encountered other than tellurium breath.

Potential Exposure

Bismuth telluride is used in thermoelectric cooling, power generation, semiconductor manufacture; pharmaceuticals; medical therapy; cosmetics. Exposure involves those working in “Silicon Valley” and similar locations around the world. An alloy of two metallic elements that are sometimes doped with SeS. The SeS dopant alters the electrical properties, but has too low a concentration to affect the chemical properties.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seekmedical attention immediately. If this chemical contactsthe skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately.If this chemical has been inhaled, remove fromexposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing hasstopped and CPR if heart action has stopped. Transferpromptly to a medical facility. When this chemical hasbeen swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make anunconscious person vomit.
Note to physician: For severe poisoning BAL [BritishAnti-Lewisite, dimercaprol, dithiopropanol (C3H8OS2)] hasbeen used to treat toxic symptoms of certain heavy metalspoisoning. In the case of bismuth poisoning it may haveSOME value. Although BAL is reported to have a largemargin of safety, caution must be exercised, because toxiceffects may be caused by excessive dosage. Most can beprevented by premedication with 1-ephedrine sulfate(CAS: 134-72-5).

storage

Color Code—Blue: Health Hazard/Poison: Storein a secure poison location. Bismuth telluride must bestored to avoid contact with strong oxidizers (such as chlorine, bromine, and fluoride), since violent reactions occur.Store in tightly closed containers in a cool, well-ventilatedarea away from moisture.

Shipping

UN3284 Tellurium compound, n.o.s., Hazard Class: 6.1; Labels: 6.1—Poisonous materials, Technical Name Required.

Incompatibilities

Reacts with acids forming toxic gases. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Toxic and flammable gas may slowly evolve from contact with moisture.