Description of Lithiumaluminate Crystal Substrates
LaAlO2 single crystal is the primary industrially produced, large-scale high-temperature superconducting thin-film substrate material. Single crystals and substrates with diameters of 2 inches or more are produced by using a pull-up method. It is compatible with high-temperature superconducting materials such as YBaCuO and lattice structures, and it exhibits a low dielectric constant and low microwave loss. Consequently, it is used in high-temperature superconducting microwave electronics (for example, high-temperature superconducting microwave filters in telecommunications).

Specifications for Lithiumaluminate Crystal Substrates
Key Performance Parameters
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Crystal structure
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Tetragonal system
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Lattice constant
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a = 5.17 Å, c = 6.26 Å
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Melting point (°C)
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1900
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Density
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2.62 (g/cm³)
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Hardness
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7.5 (Mohs)
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Standard dimensions (mm)
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10x3, 10x5, 10x10, 15x15, 20x15, 20x20 mm
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Ø20 mm, Ø1′, Ø2′.
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Thickness
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0.5 mm, 1.0 mm
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Polishing
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Single-sided or double-sided polished
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Crystal orientation
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<100>, <001>, <110>
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Orientation accuracy
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±0.5°
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Edge alignment accuracy
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2° (with some items achieving 1° accuracy)
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Other crystal angles
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Custom sizes and orientations are available upon request
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Roughness (Ra)
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≤5 Å (5 µm×5 µm)
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Applications of Lithiumaluminate Crystal Substrates
Lithiumaluminate crystal substrates are used in high-temperature superconducting microwave electronics (for example, in high-temperature superconducting microwave filters in telecommunications).