Sapphire Thermal Conductivity Temperature

Thermal coefficient of linear expansion k 1 at 323k.

Sapphire thermal conductivity temperature.

4 5 10 6 k 1 and 1000 c. 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. 756 j kg c at 182 c. Sapphire properties chemical properties.

Wood generally conducts better along the grain than across it. Some etching by hot phosphoric acid and strong caustics at temperatures exceeding 600 c 800 c thermal properties. 23 0 w m c at 77 c. 4 8 x 10 5.

2053 c 3727 f most properties useful to maximum. From 0 k it is start from zero value and in a particular temperature it reach a maximum peak. Non porous unlike alumina ceramics. Single crystal sapphire is used as a material for substrates in super high frequency regions.

Resistivity ohm x cm. Thermal conductivity k strongly depends on temperature and it look like a bell. 750 j k at 300 k viscosity 2053 c. 9 0 10 6 k 1 90 orientation specific heat capacity.

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. Good thermal conductivity and high heat resistance. No significant thermal resistance due to bonded inter face was found from this measurement. At 25 c 10 14 ohm cm.

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. 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 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 as a reference.

6 66 x 10 6 parallel to optical axis 5 x 10 6 perpendicular to optical axis. Thermal conductivity w m x k at 300k. It is also used as an insulation material and microwave window. 40 w m k 298 k expansion 25 c.