MgO Wafer (Magnesium Oxide Substrate)
High-quality MgO wafers for superconducting, epitaxial, and thin-film applications.
Description
🔷 Overview
Magnesium Oxide (MgO) wafers are single-crystal substrates widely used in thin-film deposition, superconducting devices, and oxide electronics.
MgO features a wide bandgap (~7.8 eV) and excellent insulating properties, making it an ideal dielectric substrate for electronic and optical applications.
Its cubic crystal structure (rock-salt) provides excellent lattice matching with a wide range of oxide and nitride materials, enabling high-quality epitaxial growth.
In addition, MgO offers high thermal stability, chemical resistance, and low dielectric loss, making it especially suitable for high-temperature superconducting films, microwave devices, and advanced research applications.
🔷 Key Features
- Wide bandgap (~7.8 eV) for insulating applications
- Excellent lattice matching for oxide thin films
- High thermal stability and high melting point (~2800°C)
- Low dielectric loss for microwave/RF devices
- High optical transparency (UV–IR range)
- Good chemical stability and corrosion resistance
- Suitable for high-temperature and harsh environments
🔷 Specifications
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Product: |
Single crystal MgO wafer |
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Purity: |
> 99.99% |
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Material property: |
Crystal structure: cubic |
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Lattice constant: a = 4.216 Å |
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Density: 3.98 g/cm3 |
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Melting point: 2800 °C |
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Hardness: 5.5 mohs |
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Coefficient of Thermal expansion: 11.2 x 10-6 / ℃ |
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Thermal Conductivity: 0.14 @300K ( cal/cm sec degree ) |
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Dielectric Constant: ~ 9.8 @300K |
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Optical transmission: > 90% (200-400 nm), > 98% (500 – 1000 nm) |
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Growth method: Special Arc Melting |
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Dimension: |
• 5 × 5 mm • 5 × 10 mm • 10 × 10 mm • 20 × 20 mm • φ1″ x 0.5mm |
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Thickness: |
• 0.1 mm • 0.5 mm • 1.0 mm • 2.0 mm • Other sizes customizable |
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Orientation: |
• <100> ± 0.5° • <110> ± 0.5° • <111> ± 0.5° • other off-angle |
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Polishing: |
• Fine ground • Single side epi-polished • double side epi-polished |
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Surface roughness: |
< 0.5 nm |
🔷 Applications
- High-temperature superconducting thin films (HTS)
- Oxide thin-film epitaxy (ferroelectric, magnetic films)
- Microwave and RF devices
- Optical thin films and coatings
- Spintronic and magnetic devices
- Semiconductor research and sensors
🔷 Why Choose MgO
- Excellent substrate for superconducting films (YBCO等)
- Ideal lattice matching for oxide and nitride materials
- Low dielectric loss for high-frequency devices
- High thermal and chemical stability for harsh environments
- Wide optical transparency range for photonic applications
🔷 Customization Options
We support customized MgO wafers based on your requirements:
- Size and thickness
- Orientation (<100>, <110>, <111>)
- Surface polishing (SSP / DSP)
- Epitaxial-grade substrates
- Research-grade substrates
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