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
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