Sapphire Thermal Conductivity Low Temperature

Sapphire optical and thermal properties graphs r6.

Sapphire thermal conductivity low temperature.

Good thermal conductivity and high heat resistance. The thermal conductivities of common substances span at least four orders of magnitude. 00 o o 200 400 600 temperature is k fig. Single crystal sapphire is used as a material for substrates in super high frequency regions.

Measured thermal conductivity of x a 203 and calculated from eq. The departures from a strict t 3 dependence of thermal conductivity on temperature noted in experimental data gathered on several different samples. Specially obtained high rrr value copper is often used only when very low temperatures 40 k and necessarily high thermal conduction at low temperature are required. Heat capacity internal energy thermal expansion transport properties.

It is also used as an insulation material and microwave window. We offer sapphire substrates with three different surface finish qualities. Measured thermal conductivity of sapphire 1 c and calculated from eq. Low temperature optical measurements will also benefit from the higher thermal conductivity of sapphire substrates and they may also be used in high temperature environments up to 2300 k.

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. Temperature k conductivity w cm k ermal conductivity 0 to 200 k ermal conductivity 0 to 1800 k 0 01 0 1 1 10 100 1000 0 200 400 600 800 1000 1200 1400 1600 1800 absorption coe cient vs wavelength 500 c 1000 c. Gases generally have low thermal conductivity and pure metals have high thermal conductivity. Typical properties of sapphire wafers and substrates sapphire is a single crystal al 2 o 3 with a hexagonal rhombohedral crystal structure.

Results of new model calculations indicate that the dependence of conductivity on length is different from the relationship obtained by other workers. A study of the low temperature thermal conductivity of sapphire single crystals has been made. 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. 1 2 low temperature properties of materials materials properties affect the performance of cryogenic systems.

Sapphire wafers and sapphire substrates are available in c r a and m plane orientations. Thermal conductivity electrical conductivity. For example under standard conditions the thermal conductivity of copper is over 10 000 times that of air. 5 1 1 low temperature x high temperature laser flash device.