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Keywords:

  • silicon nitride;
  • specific heat;
  • glass;
  • low temperature;
  • sintering

The specific heat of HIP sintered Si3N4 with 3 mol% Y2O3 and 3 mol% Al2O3 additives was measured at different temperatures ranging from 2 to 10 K, in order to confirm the presence of a glassy phase in the sintered body. The grainboundary glassy phase in the sintered Si3N4 was evaluated by specific heat measurements. The difference between the experimental value and the lattice specific heat calculated from the Debye theory confirmed the existence of a glassy phase in sintered Si3N4.