High wear and scratch resistance. Synthetic sapphire is the hardest of all known oxide crystals with a 9 on the Mohs scale. 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 . It is widely used as a unique heat-dissipating material due to its light transmitting properties, heat resistance, and corrosion resistance. Good Thermal Conductivity and High Heat Resistance. Thermal Properties: Melting Point: ~2053°C (3727°F) Most properties useful to (maximum): ~1800°C (3272°F) Conductivity: 40 W/M°K @ 298°K Expansion @ 25°C: 4.5×10-6/K-1 and @ 1000°C: 9.0×10-6/K-1 (90° orientation) Specific Heat Capacity: 750 J/K at 300°K Viscosity @ 2053°C: 0.0584 Pa•s Optical Properties: Refractive Indices: Between 2 and 4 °K the values of K/ T 3 were independent of T in agreement with the Casimir theory with values for 2 samples agreeing with theory in magnitude and 2 disagreeing by being 15% low. A comparison of the effect of radiation on the thermal conductivity of sapphire at low and high temperature Abstract It has been proposed that sapphire be used in insulating feedthroughs and windows in radiofrequency and microwave heating systems in fusion reactors. Mechanical, Chemical, Thermal and more all listed out in plain english. Sapphire Optical and Thermal Properties Graphs-r6 Created Date: Sapphire Properties. Good Thermal Conductivity and High Heat Resistance. A broken line shows Other properties are detailed. Size of errors were evaluated from fluctuation of voltage readout of DMM. Thermal conductivity and linear thermal expansion of sapphire Sapphire is an oxide crystal with a high thermal conductivity comparable to that of stainless steel at room temperature. Sapphire can be used for microwave applications; from the heating of food products, and plasma generation, to radome systems. The thermal conductivity of sapphire between 0.4 and 4 °K M.W.Wolfmeyer∗∗ J.R.Dillinger https://doi.org/10.1016/0375-9601 (71)90853-X Get rights and content Abstract Measurements are given of the thermal conductivity K of 4 samples of single crystal sapphire between 0.4 and 4 °K. Due to the unique physical properties of sapphire - i.e. Thermal 0.4 watts/ cm°K (25°C) Conductivity 0.1 watts/ cm°K (1000°C) K) along the C-axis Sapphire is a notable example of variable thermal conductivity based on orientation and temperature, with 35W/(m and 32 W/(m K) along the A-axis OPTICAL Uniaxial Negative Refractive Index Ordinary ray (C-axis) N Properties of Sapphire Wafers, Sapphire Thermal Conductivity HOME Sapphire Properties of sapphire substrate and sapphire wafers Typical Properties of Sapphire Wafers and Substrates Sapphire is a single crystal Al 2 O 3 with a hexagonal (rhombohedral) crystal structure. In order to obtain a detailed verification of the theory of thermal conduction in dielectric crystals, measurements have been made on a number of artificial sapphire crystals between 20 and 1000 K. In the region of the maximum there are variations in conductivity between crystals from different sources. It has excellent transparency and superior properties to glass. Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium.The name sapphire is derived from the Latin "saphirus" and the Greek "sapheiros", both of which mean blue. Single crystal sapphire (alumina 99.9%) is a hard, refractory material suitable for use at high temperatures and pressures. Sapphire is an anisotropic, rhombohedral crystalline form of aluminium oxide. Sapphire: AKQ-10, AKX-5, AKS-G312 and Sintered Alumina for all methods of crystal growth. These sapphire properties may be dependent upon relative crystal orientation, form and surface quality . Obtained thermal conductivity reaches Single crystal sapphire (alumina 99.9%) is a hard, refractory material suitable for use at high temperatures and pressures. It has an extremely wide transmission spectrum (150 nm to 6.0 µm). Other properties are detailed. Synthetic Sapphire is a single crystal form of corundum, Al 2 O 3, also known as alpha-alumina, alumina, and single crystal Al 2 O 3. High electrical resistance. The various properties of sapphire are a function of the direction within the crystal with respect to the optic axis. Its high melting point, good thermal conductivity and low thermal expansion provide excellent performance in high temperature environments. Sapphire is a single crystal Al 2 O 3 with a hexagonal (rhombohedral) crystal structure. The properties of sapphire. Alumina Ceramic: AES Series, ALM-41, AKP-20, AKP30, AKP-53 and AA-04 for ceramic applications such as semiconductor devices, insulators, electrical power devices and more. Sapphire (Sapphire, molecular formula Al2O3) single crystal is an excellent multifunctional material. materials. At room temperature, the average thermal conductivity is 237±6Wm−1K−1measured by the 3ω method and 247±20Wm−1K−1by TDTR (for sample II), these values being consistent with each other and similar to others reported in the lit- erature.28,29We also report the thermal boundary conductance (TBC), G b≈117MWm The combination of favourable chemical, electrical, mechanical, optical, surface, thermal, and durability properties make sapphire a preferred material for high performance system and component designs. PROPERTIES OF SAPPHIRE PHYSICAL THERMAL Chemical formula Al 2O3 Thermal conductivity 0.065 cal cm-1 s-1 °C-1 Crystal structure Hexagonal system (rhombohedral) (60° to c-axis) at 25 °C Unit cell dimension a = 4.758 Å , c = 12.991 Å Thermal expansion 8.40 x 10-6 °C-1 Density 3.98 g cm-3 coefficient The materials currently in the database are ones commonly used in the construction of cryogenic hardware. Due to sapphire's RF transparency, thermal conductivity, and high-temperature resistance, it is the ideal material of choice for products that require resistance to radiation damage in high-power microwave applications high thermal, mechanical, and chemical strength, impressive thermal conductivity and optical transparency, these cryoapplicators yield combination of the tissue cryodestruction with its exposure to laser radiation for controlling the thermal regimes of cryosurgery, and with the optical . Sapphire Thermal Conductivity | Semi Standard Wafers R-plane sapphire for SOS silicon-on-sapphire Polished R-plane Sapphire Wafers for SOS Valley Design offers thinning and polishing services on customer supplied SOS wafers. In order to obtain a detailed verification of the theory of thermal conduction in dielectric crystals, measurements have been made on a number of artificial sapphire crystals between 2° and 100° K. In the region of the maximum there are variations in conductivity between crystals from different sources. Single Crystal Sapphire also possesses a wide transmission wavelength region. No significant thermal resistance due to bonded inter- face was found from this measurement. Single Crystal Sapphire is used for various kinds of vacuum equipment, windows in reaction furnaces, scanner windows and caps for optical communication due to its excellent mechanical characteristics and heat resistance. The combination of favourable chemical, electrical, mechanical, optical, surface, thermal, and . Download Table | Thermal Properties of Sapphire a Parameter Temperature K 300 77 Thermal conductivity, K W m 1 K 1 42 1000 from publication: Kilohertz Pulse Repetition Frequency Slab Ti:sapphire . Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium.The name sapphire is derived from the Latin "saphirus" and the Greek "sapheiros", both of which mean blue. 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 of the sapphire bar with heat flow along c-axis. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange . The thermal conductivity (data at 80 K Hemex sapphire ⊥ to c -axis 2.5 W/cm K; A1N SHAPAL at 100 K 2.1 W/cm K; MgAl 2 O 4 single crystal at 100 K 0.82 W/cm K) is discussed taking into account point defects as well as dislocations and grain boundary scattering of phonons for the polycrystalline aluminium oxide. The properties available include thermal conductivity, specific heat, linear thermal expansion, thermal expansion coefficient, and Young's modulus. 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. The various properties of sapphire are a function of the direction within the crystal with respect to the optic axis. Synthetic sapphire crystals have good thermal properties, with excellent electrical and dielectric properties. Thermal 0.4 watts/ cm°K (25°C) Conductivity 0.1 watts/ cm°K (1000°C) K) along the C-axis Sapphire is a notable example of variable thermal conductivity based on orientation and temperature, with 35W/(m and 32 W/(m K) along the A-axis OPTICAL Uniaxial Negative Refractive Index Ordinary ray (C-axis) N It is resistant to high temperature, good thermal conductivity, high hardness, infrared transmission, and good chemical stability. Normal circles show thermal conductivity of the specimen. (c) The sensitivity of experimental signals to the heat capacity of sapphire, top and bottom Al layers, and an a-Si layer. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange . The thermal conductivity (data at 80 K Hemex sapphire ⊥ to c-axis 2.5 W/cm K; A1N SHAPAL at 100 K 2.1 W/cm K; MgAl 2 O 4 single crystal at 100 K 0.82 W/cm K) is discussed taking into account point defects as well as dislocations and grain boundary scattering of phonons for the polycrystalline aluminium oxide. High thermal conductivity. In two sections of the bar, ther- mal conductivity was measured between 5 K to 300K. Conductivity: 40 W/M°K @ 298°K; Expansion @ 25°C: 4.5×10-6/K-1 and @ 1000°C: . Sapphire is an anisotropic, rhombohedral crystalline form of aluminium oxide As an anisotropic crystal, it will have some properties (such as hardness and thermal expansion) which vary significantly by orientation. It has excellent transparency and superior properties to glass. Sapphire is aluminium oxide in the purest form with no porosity or grain boundaries, making it theoretically dense. Solid circles show effective thermal conductivity of the section that contains a bonded interface. Resin Filler: Alumina Hydrate C/CL/CW Series, AKP Series and Advanced Alumina Series for resin filler in artificial marble, insulation . Whilst this is unimportant for most applications it should still be considered when determining your requirements. It is resistant to high temperature, good thermal conductivity, high hardness, infrared transmission, and good chemical stability. Good Thermal Conductivity and High Heat Resistance Properties of sapphire substrate and sapphire wafers Typical Properties of Sapphire Wafers and Substrates. It has an extremely wide transmission spectrum (150 nm to 6.0 µm). Sapphire wafers and High operating temperature (1800°C) Chemically inert. Sapphire is aluminium oxide in the purest form with no porosity or grain boundaries, making it theoretically dense. Its high melting point, good thermal conductivity and low thermal expansion provide excellent performance in high temperature environments. PROPERTIES OF SAPPHIRE PHYSICAL THERMAL Chemical formula Al 2O3 Thermal conductivity 0.065 cal cm-1 s-1 °C-1 Crystal structure Hexagonal system (rhombohedral) (60° to c-axis) at 25 °C Unit cell dimension a = 4.758 Å , c = 12.991 Å Thermal expansion 8.40 x 10-6 °C-1 Density 3.98 g cm-3 coefficient High strength. Abstract. As an anisotropic crystal, it will have some properties (such as hardness and thermal expansion) which vary significantly by orientation. Download scientific diagram | (a) CAD drawing of a first prototype KAGRA suspension fiber. Whilst this is unimportant for most applications it should still be considered when determining your . Polished R-plane Sapphire Wafers for SOS Valley Design offers thinning and polishing services on customer supplied SOS wafers. Guild Optics is a manufacturer of sapphire substrates . Synthetic sapphire is second in hardness only to diamond, and retains its high strength at high temperatures. In order to obtain a detailed verification of the theory of thermal conduction in dielectric crystals, measurements have been made on a number of artificial sapphire crystals between 2° and 100° K. In the region of the maximum there are variations in conductivity between crystals from different sources. The advantages of sapphire include: Excellent optical characteristics, UV to IR. It is also a versatile single crystal substrate material and is the substrate of choice for the current blue . One section contains a bonded interface and the other section measured a thermal conductivity of the sapphire as a reference. Not all properties are available for all materials. Sapphire (Sapphire, molecular formula Al2O3) single crystal is an excellent multifunctional material. It is also a versatile single crystal substrate material and is the substrate of choice for the current blue . Measurements are given of the thermal conductivity K of 4 samples of single crystal sapphire between 0.4 and 4 °K. To facilitate handling, the fibers have with 100 mm only 1/3 of the full length, while the KAGRA design . Thermal conductivity and linear thermal expansion of Sapphire Sapphire is an oxide crystal with a high thermal conductivity comparable to that of stainless steel at room temperature. (b) The sensitivity of experimental signals of the 60 nm Si is shown in (a) to the thermal conductivity and interface conductance of the a-Si and sapphire. Sapphire Properties: 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 R-plane Sapphire (1-102), 57.6 degrees to C-plane, is the preferred material for Silicon-on-Sapphire used in semiconductor, microwave and pressure transducer applications. It is widely used as a unique heat-dissipating material due to its light transmitting properties, heat resistance, and corrosion resistance. Sapphire wafers and sapphire substrates are available in C, R, A and M plane orientations. The thermal conductivity (data at 80 K Hemex sapphire ⊥ to c-axis 2.5 W/cm K; A1N SHAPAL at 100 K 2.1 W/cm K; MgAl 2 O 4 single crystal at 100 K 0.82 W/cm K) is discussed taking into account point defects as well as dislocations and grain boundary scattering of phonons for the polycrystalline aluminium oxide.
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