Discussion
Aluminium nitride is of interest in electronics because it combines
Answer: B
Correct answer: high thermal conductivity with electrical insulation
Those two properties normally go together only in metals, which conduct both, so a material that conducts heat like a metal and blocks current like a ceramic is unusual and valuable. Aluminium nitride is used as a substrate and heat spreader in power electronics, where the heat must be carried away from the device and the current must not be. Its thermal expansion also matches silicon reasonably well.
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