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Single crystals of lanthanum aluminate (LaAlO3) is the most important industrialized , large-size high-temperature superconducting thin film substrate single crystal material. Its growth with the Czochralski method , 2 inches in diameter and larger single crystal and the substrate can be obtained It's suitable for the production of high temperature superconducting microwave electronic devices (such as long-distance communication in high-temperature superconducting microwave filters , etc.)
properties:
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Crystal structure
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M6(normal temperature)
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M3(>435℃)
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Unit cell constant
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M6 a=5.357A c=13.22 A
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M3 a=3.821 A
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Melt point(℃)
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2080
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Density
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6.52(g/cm3)
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Hardness
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6-6.5(mohs)
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Thermal expansion
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9.4x10-6/℃
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Dielectric constants
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ε=21
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Secant loss(10ghz)
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~3×10-4@300k,~0.6×10-4@77k
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Color and appearance
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To anneal and conditions differ from brown to brownish
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Chemical stability
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Room temperature is not dissoluble in minerals, the temperature is greater than 150 ℃ in soluble h3po4
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Characteristics
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For microwave electron device
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Growth method
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Czochralski method
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Size
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10x3,10x5,10x10,15x15,,20x15,20x20,
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Ф15,Ф20,Ф1″,Ф2″,Ф2.6″
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Thickness
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0.5mm,1.0mm
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Polishing
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Single or double
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Crystal Orientation
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<100> <110> <111>
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redirection precision
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±0.5°
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Redirection the edge:
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2°(special in 1°)
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Angle of crystalline
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Special size and orientation are available upon request
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Ra:
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≤5Å(5µm×5µm)
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Pack
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100 clean bag,1000 exactly clean bag
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