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