Bismuth

Bismuth

Bismuth (Bi) is a brittle, silvery-pink post-transition metal with the highest atomic number of any stable element. It has a low thermal conductivity, high diamagnetism, and a melting point of 271 °C. Bismuth exhibits unique electrical properties and is used in thermoelectric materials, pharmaceuticals, and metal alloys.

Goodfellow supplies high-purity bismuth (Bi) that caters to both traditional industries and emerging research fields. This metal is available in various forms to suit specific application needs. In pharmaceuticals, bismuth compounds are employed as active ingredients in medications that treat gastrointestinal disorders such as ulcers and diarrhea (e.g., bismuth subsalicylate). The cosmetics industry also utilizes bismuth-based pigments for their pearlescent appearance in makeup products like eyeshadow and nail polish. Industrially, bismuth alloys are used in fire safety devices such as sprinkler systems due to their low melting point, which allows them to act as fusible plugs under high temperatures. In advanced research settings, bismuth’s thermoelectric properties make it valuable for developing energy-efficient cooling systems and waste heat recovery technologies. Goodfellow’s bismuth products support innovation across multiple domains by enabling environmentally sustainable solutions while driving progress in thermoelectric materials research.



General Properties

PropertyValue
Atomic Number83
Density9.78 g/cm³
Melting Point271 °C
Boiling Point1564 °C
Thermal Conductivity7.97 W/m·K
Electrical Resistivity130 nΩ·m
Crystal StructureRhombohedral

Mechanical Properties

PropertyValue
HardnessMohs 2.25
Elastic Modulus32 GPa
Poisson’s Ratio0.33

Chemical Properties

PropertyValue
Corrosion ResistanceGood in dry air, oxidizes at higher temperatures
ReactivityReacts with halogens and strong acids
Oxidation States+3, +5
Surface OxideBismuth oxide (Bi₂O₃)
IdentifierValue
SymbolBi
Atomic Number83
CAS Number7440-69-9
UN NumberUN3089 (powder)
EINECS Number231-177-4
IsotopeTypeNotes
Bi-209Stable100% natural abundance

Scientific Applications

Use CaseDescription
ThermoelectricsUsed in materials like Bi₂Te₃ for cooling and power generation
Low‑Melting AlloysResearch on fusible safety devices and solder alloys
CatalysisUsed in green chemistry and selective oxidation catalysts
X‑ray OpticsStudied for dense lens and filter applications
Materials ScienceInvestigated in superconductivity and novel compound synthesis

Industrial Applications

Use CaseDescription
AmmunitionEco‑friendly alternative to lead shot
Cosmetics & PigmentsBismuth oxychloride used in makeup products
PharmaceuticalsBismuth subsalicylate in digestive health medications
Alloys & MetalsUsed in low‑melting fusible alloys and plumbing materials
Fire‑Detection SystemsBismuth alloys melt at precise temperatures for safety devices
GradePurityMain Use
Standard Bismuth97%General industrial use, pigment and alloy production
High-Purity Bismuth99.5%Thermoelectric prototypes & low‑temp alloys
Ultra-Pure Bismuth99.97%Electronics and advanced alloy research
Electronic Grade99.997%Sensitive deterectors, semiconductors
Research Grade99.999%High-precision instrumentation
Ultra-High Purity99.9999%Cutting-edge materials science and nanotech
Synonym
Bi
Bismuth Metal