{HEAD ~ This aluminum nitride sintered body} has an average grain size of aluminum nitride grains of 2 μm or less, a thermal conductivity of 80 W/m.K or more, and {TAIL ~ a relative density} of 98% or more 
{ HEAD ~ This aluminum nitride sintered body } has an average grain size of aluminum nitride grains of 2 μm or less , a thermal conductivity of 80 W / m. K or more , and { TAIL ~ a relative density } of 98 % or more
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