What is the Difference Between Alpha and Gamma Alumina?
🆚 Go to Comparative Table 🆚The main differences between alpha and gamma alumina lie in their structural properties, specific surface area, and applications. Here are the key differences:
- Structural Properties: Alpha alumina has a hexagonal close-packed structure, while gamma alumina has a cubic spinel structure.
- Specific Surface Area: Alpha alumina has a low specific surface area of about 5 square meters per gram, while gamma alumina has a much higher specific surface area of about 100 square meters per gram.
- Porosity: Gamma alumina is porous, while alpha alumina is almost non-porous.
- Particle Size: Alpha alumina typically has a particle size in the range of 30 to 60 nm, while gamma alumina has a particle size of around 20 to 30 nm.
- Applications: Alpha alumina is used in applications that require high strength, corrosion resistance, and low-alkali content, such as in electronic applications. Gamma alumina is an extensively used material with applications ranging from absorbents to heterogeneous catalyst supports.
In summary, alpha alumina is a compact, non-porous, and low surface area material, while gamma alumina is a porous, high surface area material with a different crystal structure. Their distinct properties make them suitable for different applications.
On this pageWhat is the Difference Between Alpha and Gamma Alumina? Comparative Table: Alpha vs Gamma Alumina
Comparative Table: Alpha vs Gamma Alumina
The main differences between alpha and gamma alumina lie in their structure, properties, and applications. Here is a table summarizing the key differences:
Property | Alpha Alumina | Gamma Alumina |
---|---|---|
Crystal Structure | Stable, hexagonal | Metastable, cubic |
Surface Area | Low | High |
Porosity | None | Present |
Melting Point | High | Low |
Application | Plastics, ceramics, synthetic rubies, aluminum garnets | Thermal applications, ceramics, sapphires |
- Alpha alumina has a stable, hexagonal crystal structure, while gamma alumina has a metastable, cubic crystal form of aluminum oxide.
- Alpha alumina has a low surface area, while gamma alumina has a high surface area with some porosity.
- Alpha alumina has a high melting point, making it suitable for applications in plastics, ceramics, and synthetic rubies, while gamma alumina has a low melting point and is used in thermal applications and sapphires.
Both alpha and gamma alumina are used as precursors for the production of other aluminum oxide-based materials.
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