Mateck Sapphire (Al 2 O 3 )

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Mateck Sapphire (Al₂O₃)
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Optical crystals
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Physical Properties	Metric	English	Comments

Density	3.98 g/cc	0.144 lb/in³
a Lattice Constant	4.758 Å	4.758 Å
c Lattice Constant	12.991 Å	12.991 Å
Molecular Weight	101.96 g/mol	101.96 g/mol

Mechanical Properties	Metric	English	Comments
Vickers Microhardness	1940	1940	MPa
	2200	2200	MPa
Hardness, Mohs	9.0	9.0
Modulus of Elasticity	426.4 GPa	61850 ksi	parallel to c-axis
	462.6 GPa	67100 ksi	perpendicular to c-axis
Poissons Ratio	0.309	0.309
Shear Modulus	144.3 GPa	20930 ksi	perpendicular to c-axis
	162.9 GPa	23630 ksi	parallel to c-axis

Thermal Properties	Metric	English	Comments
CTE, linear	3.24 - 5.66 µm/m-°C @Temperature -60.0 - 60.0 °C	1.80 - 3.14 µin/in-°F @Temperature -76.0 - 140 °F	perpendicular to c-axis
Specific Heat Capacity	0.761 J/g-°C	0.182 BTU/lb-°F
Thermal Conductivity	23.1 W/m-K @Temperature 46.0 °C	160 BTU-in/hr-ft²-°F @Temperature 115 °F	parallel to c-axis
	25.2 W/m-K @Temperature 46.0 °C	175 BTU-in/hr-ft²-°F @Temperature 115 °F	perpendicular to c-axis
Melting Point	2030 °C	3690 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.6679 @Wavelength 4000 nm	1.6679 @Wavelength 4000 nm
	1.6748 @Wavelength 4000 nm	1.6748 @Wavelength 4000 nm
	1.692 @Wavelength 3000 nm	1.692 @Wavelength 3000 nm
	1.7015 @Wavelength 3000 nm	1.7015 @Wavelength 3000 nm
	1.746 @Wavelength 1000 nm	1.746 @Wavelength 1000 nm
	1.7545 @Wavelength 1000 nm	1.7545 @Wavelength 1000 nm
	1.7771 @Wavelength 546.1 nm	1.7771 @Wavelength 546.1 nm	at ne
Transmission, Visible	97 % @Wavelength 500 nm	97 % @Wavelength 500 nm	Internal Transmittance
IR Transmittance	45 % @Wavelength 5000 nm	45 % @Wavelength 5000 nm	Internal Transmittance
	97 % @Wavelength 1000 nm	97 % @Wavelength 1000 nm	Internal Transmittance
	97 % @Wavelength 3000 nm	97 % @Wavelength 3000 nm	Internal Transmittance
UV Transmittance	79 % @Wavelength 200 nm	79 % @Wavelength 200 nm	Internal Transmittance

Descriptive Properties
Cleavability	(1011)		imperfect
	(1120)
Constants of Elastic Compliance (Pa^-1)	2.2E-12		S33
	2.3E-12		S11
	4E-13		S13
	5E-13		S14
	-6.8E-12		S44
	-7E-13		S12
Symmetry	tetragon
Symmetry Class	3m
Thermal Coefficient of Refractive Index	8.8E-6 to 1.28E-5		ß0 at 3.39 microns for ±60°C
	9.9E-6 to 1.39E-5		ße at 3.39 microns for ±60°C
Thermal Stability, °C	162±8
Transmission Range (microns)	0.17 - 5

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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CMAT051 / 87735

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