Bismuth telluride

  • Dibismuth tritelluride
  • bismuth sesquitelluride
Formula
Bi2Te3
Structure
Description
Gray powder or pieces. No odor.
Uses
Substance is used in electronics as semiconductor.

Registry Numbers and Inventories.
CAS
1304-82-1
EC (EINECS/ELINCS)
215-135-2
RTECS
EB3110000
RTECS class
Other
UN (DOT)
3284
Merck
12,1331
Beilstein/Gmelin
11110 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Bi2Te3
Formula mass
800.76
Melting point, °C
585
Density
7.69 g/cm3
Solubility in water
Insoluble
Thermal expansion
0.0000129/K
Heat of fusion
117.20 kJ/mol

Hazards and Protection.
Storage
Keep container tightly closed, in a cool dry location.
Handling
Wear protective clothing to prevent contamination. Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating and smoking. do not blow dust off clothing or skin with compressed air.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong acids, moisture, water and oxidizing agents.
Decomposition
May react with water to evolve toxic gases.

Fire.
Fire fighting
Use method most appropriate to fight surrounding fire.
Fire potential
Non-Combustible
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
May cause irritation to the respiratory system, a dry mouth, metallic taste, gingivitis, garlic odor to breath, sweat and urine.
   Inhalation
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin
Avoid any skin contact. See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Remove material from skin immediately. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
3284
Response guide
Hazard class
6.1
Packing Group
I; II; III