Germanium granules
Properties
Chemical symbol: Ge
Name: Germanium granules / granular germanium
CAS No.: 7440-56-4
Molar mass: 72.63 g/mol
Density: 5.32 g/cm³
Particle size: typically 1-5 mm
Purity: typically 99.999-99.9999% (5N-6N)
Melting point: approx. 938 °C
Boiling point: approx. 2833 °C
Band gap: approx. 0.66 eV at room temperature
Color: gray with metallic luster
Form: granules
Germanium granules are a high-purity, finely divided product form of the semiconductor element germanium. The material is supplied as gray metallic granules with a defined particle size, typically in the range of 1 to 5 mm.
The granular form is particularly suitable for evaporation, alloying and high-vacuum processing. Its controlled geometry provides uniform packing in evaporation boats and crucibles and supports stable, homogeneous melting behavior.
Germanium granules are typically available in purity grades from 99.999% (5N) to 99.9999% (6N). Low impurity concentrations are especially important for functional thin-film deposition, semiconductor processing and research applications.
At room temperature, germanium has an indirect band gap of approximately 0.66 eV. It also offers excellent optical transmission in the infrared spectral range, particularly between approximately 2 and 14 µm.
Germanium is stable in dry air and forms germanium dioxide, GeO₂, at elevated temperatures. The material is insoluble in water but dissolves in oxidizing acid mixtures.
Granular germanium is mainly produced by crushing and fractionating zone-refined polycrystalline germanium ingots or by controlled solidification of high-purity molten germanium. Compared with massive ingots, the granular form offers lower thermal inertia and therefore faster melting during processing.
Germanium metal is particularly important in PVD processing, thin-film optics, chalcogenide glass synthesis, semiconductor technology and materials research. Would you like to buy germanium granules? Auremo can provide information about available purity grades and particle sizes. The germanium price, germanium metal price and germanium price per kg depend on purity, granule size, order quantity and delivery conditions.
Advantages
• Uniform melting and evaporation behavior
• Optimized geometry for vacuum processes
• High purity of 5N-6N
• Low concentration of unwanted impurities
• Accurate and reproducible dosing
• Suitable for automated feeding systems
• Faster melting than massive ingots
• Well suited for functional thin-film deposition
Applications
• PVD deposition
• Thermal evaporation
• Electron-beam evaporation
• Infrared-reflective coatings
• Antireflective optical coatings
• Thin-film optics
• Chalcogenide glass synthesis
• Ge-Sb-Se specialty glasses
• Thermal imaging and night-vision optics
• Silicon-germanium SiGe materials
• High-frequency electronics
• Research on thermoelectric materials
Auremo offers high-purity germanium granules and other specialty materials for industrial, research and advanced technical applications. If you have any questions about purity, particle size, available fractions or delivery conditions, please contact us directly.
