Bismuth Oxide Ceramic Flux and Dopant
CAS Number: 1304-76-3
Bismuth oxide (Bi2O3) is a versatile low-melting flux and functional dopant in ceramic and glass applications. In ZnO varistors, 0.5–1 mol% Bi2O3 creates intergranular amorphous layers responsible for non-linear varistor characteristics. In LTCC (low-temperature co-fired ceramics), bismuth-containing frits enable densification below 900 °C, compatible with silver and gold electrode metallization.
Technical Specifications
| appearance | Yellow powder |
| purity (%) | ≥99.9 |
| Bi2O3 content (%) | ≥99.9 |
| melting point (°C) | 817 |
| D50 particle size (µm) | 1.0–5.0 |
Applications
- Dopant in ZnO varistor ceramics for surge protection
- Low-temperature flux in LTCC ceramic tape formulations
- Sintering aid for lead-free piezoelectric ceramics
- Glass colorant and heavy-element optical glass component
- Bismuth ferrite multiferroic ceramic research material
Key Features
- Low melting point (817 °C) enables ultra-low firing temperature ceramics
- Creates intergranular phases critical for varistor functionality
- Compatible with Ag/Au metallization in LTCC co-firing
- High refractive index useful in specialty optical glass formulations
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CAS Number
1304-76-3
Category
Ceramic / Glass AdditivesAvailability
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