Sapphire Thermal Conductivity Temperature

Resistivity ohm x cm.

Sapphire thermal conductivity temperature.

2053 c 3727 f most properties useful to maximum. Thermal conductivity w m x k at 300k. From 0 k it is start from zero value and in a particular temperature it reach a maximum peak. At 25 c 10 14 ohm cm.

Sapphire properties chemical properties. 4 5 10 6 k 1 and 1000 c. 750 j k at 300 k viscosity 2053 c. Thermal conductivity k strongly depends on temperature and it look like a bell.

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. Virtually unaffected by any solvents or acids at room temperature. Good thermal conductivity and high heat resistance.

Sapphire as a reference. Single crystal sapphire is used as a material for substrates in super high frequency regions. 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. No significant thermal resistance due to bonded inter face was found from this measurement.

4 8 x 10 5. 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. 40 w m k 298 k expansion 25 c.

Non porous unlike alumina ceramics. It is also used as an insulation material and microwave window. 756 j kg c at 182 c. 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. 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. Wood generally conducts better along the grain than across it. Thermal coefficient of linear expansion k 1 at 323k.