Sapphire Thermal Conductivity Temperature

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Thermal electrical and optical ir transmission vs wavelength 500 c 20 c 1000 c 0 0 2 3 4 5 6 10 20 30 40 50 60 70 80 90 100 wavelengths microns transmission dielectric constant vs temperature parallel to c axis perpendicular to c axis 0 200 400 600 800 1000 1200 8 9 10 11 12 13 14 15 16 17 temperature c dielectric constant.

Sapphire thermal conductivity temperature.

Sapphire properties chemical properties. Single crystal sapphire is used as a material for substrates in super high frequency regions. From 0 k it is start from zero value and in a particular temperature it reach a maximum peak. Some etching by hot phosphoric acid and strong caustics at temperatures exceeding 600 c 800 c thermal properties.

Sapphire as a reference. Resistivity ohm x cm. It is also used as an insulation material and microwave window. Thermal conductivity w m x k at 300k.

Virtually unaffected by any solvents or acids at room temperature. No significant thermal resistance due to bonded inter face was found from this measurement. 4 5 10 6 k 1 and 1000 c. 2053 c 3727 f most properties useful to maximum.

At 25 c 10 14 ohm cm. Single crystal single crystal sapphire is used for various kinds of vacuum equipment windows in excellent thermal conductivity at low temperatures allows single crystal sapphire as a. Wood generally conducts better along the grain than across it. Obtained thermal conductivity reaches κ 1 104 w m k in temperature range of t 20 30 k which is a planned operating temperature of a cryogenic mirror of the large scale cryogenic grav itational wave telescope.

Sapphire is a notable example of variable thermal conductivity based on orientation and temperature with 35 w m k along the c axis and 32 w m k along the a axis. 25 8 w m c at 70 c. 4 8 x 10 5. 6 66 x 10 6 parallel to optical axis 5 x 10 6 perpendicular to optical axis.

Excellent thermal conductivity at low temperatures allows single crystal sapphire as a transparent material to be used in many diverse fields requiring thermal conduction and heat radiation. Thermal conductivity k strongly depends on temperature and it look like a bell. 750 j k at 300 k viscosity 2053 c. Good thermal conductivity and high heat resistance.

23 0 w m c at 77 c. Thermal coefficient of linear expansion k 1 at 323k. 756 j kg c at 182 c. 23 1 parallel to optical axis 25 2 perpendicular to optical axis.

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