Nierite Yang P, Fun H-K, Rahman I A, Saleh M I Ceramics International 21 (1995) 137-142 Two phase refinements of the structures of a-Si3N4 and B-Si3N4 made from rice husk by Rietveld analysis Locality: synthetic Sample: Alpha phase Note: changed N4 location to match reported bond distances _database_code_amcsd 0012185 7.7650 7.7650 5.6275 90 90 120 P31c atom x y z Biso Si1 .5106 .0815 .1904 .73 Si2 .1658 .2520 -.0168 .54 N1 0 0 -.029 .26 N2 1/3 2/3 .634 .3 N3 .3488 -.0383 -.022 .8 N4 .3092 .3546 .230 .1