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BISMUTH TELLURIDE

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BISMUTH TELLURIDE Basic information

Product Name:
BISMUTH TELLURIDE
Synonyms:
  • bismuthsesquitelluride
  • BISMUTH TELLURIDE, 99.99%
  • Bismuth telluride, se-doped
  • Bismuth(3 ) telluride
  • Einecs 215-135-2
  • BisMuth(III) telluride powder, -325 Mesh, 99.99% trace Metals basis
  • Bismuth(III) telluride beads, 99.995% trace metals basis
  • Bismuth(III) telluride (Bi2Te3)
CAS:
1304-82-1
MF:
Bi2Te3
MW:
800.76
EINECS:
215-135-2
Product Categories:
  • Ceramic Science
  • Chalcogenides
  • Materials Science
  • Metal &amp
  • Metal and Ceramic Science
  • New Products for Materials Research and Engineering
Mol File:
1304-82-1.mol
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BISMUTH TELLURIDE Chemical Properties

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)
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Safety Information

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)

MSDS

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BISMUTH TELLURIDE Usage And Synthesis

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.

BISMUTH TELLURIDESupplier

J & K SCIENTIFIC LTD.
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INTATRADE GmbH
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3B Pharmachem (Wuhan) International Co.,Ltd.
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Alfa Aesar
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400-6106006
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