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Sapphire is used as an insulating substrate upon which to deposit silicon to make the integrated circuits, high-power radio-frequency (RF) applications such as those found in cellular telephones, public-safety band radios, and satellite communication systems, used in the semiconductor industry, blue light-emitting diodes.
Manasevit, H.M.; Simpson, W.I. Single-Crystal Silicon on a Sapphire Substrate. J. Appl. Phys. 1964, 35, (4), 1349.