Sapphire Thermal Conductivity Temperature

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 thermal conductivity temperature.

It is also used as an insulation material and microwave window. Resistivity ohm x cm. Wood generally conducts better along the grain than across it. Thermal coefficient of linear expansion k 1 at 323k.

750 j k at 300 k viscosity 2053 c. Thermal conductivity w m x k at 300k. Thermal conductivity k strongly depends on temperature and it look like a bell. At 25 c 10 14 ohm cm.

Non porous unlike alumina ceramics. Good thermal conductivity and high heat resistance. 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. 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.

23 0 w m c at 77 c. 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. 756 j kg c at 182 c. 2053 c 3727 f most properties useful to maximum.

9 0 10 6 k 1 90 orientation specific heat capacity. No significant thermal resistance due to bonded inter face was found from this measurement. 4 8 x 10 5. Sapphire as a reference.

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. Single crystal sapphire is used as a material for substrates in super high frequency regions. Some etching by hot phosphoric acid and strong caustics at temperatures exceeding 600 c 800 c thermal properties. 23 1 parallel to optical axis 25 2 perpendicular to optical axis.

4 5 10 6 k 1 and 1000 c. 40 w m k 298 k expansion 25 c. 25 8 w m c at 70 c. Virtually unaffected by any solvents or acids at room temperature.