Properties: Crystallographic • Optical • Thermal • Mechanical • Chemical
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Syngony
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Tetragon
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Symmetry Class
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3m
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Lattice Constants, Angstroms
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a=4.758 c=12.991
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Cleavability
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(1011),(1012), imperfect
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Refractive Index at ne
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1.7771
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Refractive Index, nF'-nC'
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no
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0.0107
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Thermal Coefficient of Refractive Index at l=0.46 microns,îÑ-1
for +/-60îÑ
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bo
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(0.88¸1.28)•10-5
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be
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(0.99¸1.39)•10-5
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Transmission Range, microns (thickness 10ìì)
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0.17 ¸5.0
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Transmittance ti(l) vs. wavelength l
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Internal Transmittance ti(l) vs.
wavelength l
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l,ìêì
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ti(l)
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0.2
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0.79
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0.5
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0.97
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1.0
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0.97
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3.0
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0.97
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5.0
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0.45
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Refractive Index n vs.
wavelength l
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l,ìêì
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no/ne
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0.2
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0.5
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1.0
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1.7545
1.7460
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2.0
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1.7374
1.7299
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3.0
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1.7015
1.6920
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4.0
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1.6748
1.6679
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Thermal Linear Expansion at, îÑ-1 for +/-60îÑ
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^to c-axis
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(3.24-5.66)•10-6
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Thermal Conductivity, W/(m •îÑ) at 26 îÑ
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// to c-axis
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25.2
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^to c-axis
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23.1
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Specific Heat Capacity, J/(kg •îÑ) at 18 îÑ
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761
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Thermal Stability, îÑ
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162 +/-8
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Melting Point, îÑ
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2030
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Density, g/cm3 at 20 îÑ
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3.98
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Mohs Hardness
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9
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Vickers Microhardness , Pa
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^to c-axis
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2200• 107
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|| to c-axis
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1940• 107
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Constants of Elastic Compliance, Pa-1
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S11
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2.3•10-12
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S12
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-0.7•10-12
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S13
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-0.4•10-12
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S33
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2.2•10-12
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S44
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6.8•10-12
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S14
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0.5•10-12
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Poisson Ratio
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|| to c-axis
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0.309
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Young Modulus (Å), Pa
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|| to c-axis
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46.26• 10-10
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^to c-axis
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42.64• 10-10
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Shear Modulus (G), Pa
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|| to c-axis
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14.43• 10-10
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^to c-axis
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16.29• 10-10
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Solubility Al2O3 ( Sapphire )
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in water at 20 îÑ
g/100cm3
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in acids
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98*10-6
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-
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