ALUMINA, TITANIA, CERIA, SILICATE, TUNGSTATE AND OTHER MATERIALS
11.1 ALUMINA
Alumina has a high melting point of about 2050°C with εr of about 10, relatively high thermal conductivity and low dielectric loss and is a well-known ceramic packaging material. Most of the properties of the high-purity alumina such as thermal expansion, thermal conductivity, elastic modulus, melting point, Poisson’s ratio and permittivity fall within a narrow range for different samples from a wide range of sources. However, the dielectric loss is highly variable from sample to sample varying over several orders of magnitude. Powder purity is an important factor in the production of low-loss alumina [1–4]. In poly crystalline alumina, the quality ...
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