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Table 4 XRD and characteristics of the obtained phases

From: Microstructure of Spark Plasma-Sintered Silicon Nitride Ceramics

   The lattice constant, Å Phase, %
a c 1550 1650
β-Si3N4 P63 (173) 7.629 2.927 24 72
α-Si3N4 P31c (159) 7.753 5.624 76 28