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

      CELL PARAMETERS:    7.7650   7.7650   5.6275   90.000   90.000  120.000
      SPACE GROUP: P31c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    293.852
      Density (g/cm3):      3.170
      MAX. ABS. INTENSITY / VOLUME**2:      8.402190742    
      RIR:      0.863
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                13.17         11.77        6.7247    1   0   0         6
                20.58         64.53        4.3157    1   0   1         6
                22.91         39.41        3.8825    1   1   0         3
                26.51         35.76        3.3623    2   0   0         6
                30.98        100.00        2.8864    2   0   1         6
                31.80         10.63        2.8138    0   0   2         1
                34.55         91.32        2.5957    1   0   2         6
                35.31         71.59        2.5417    2   1   0         6
                38.88         10.52        2.3164    3  -1   1         6
                38.88         52.29        2.3164    2   1   1         6
                39.56          2.79        2.2783    2  -1   2         3
                39.56          3.72        2.2783    1   1   2         3
                40.23          3.00        2.2416    3   0   0         6
                41.86         29.66        2.1579    2   0   2         6
                43.46         40.13        2.0824    3   0   1         6
                46.80          3.95        1.9412    2   2   0         3
                48.25          1.09        1.8861    3  -1   2         6
                48.25         10.42        1.8861    2   1   2         6
                48.83          5.89        1.8651    3   1   0         6
                50.51          9.86        1.8069    1   0   3         6
                51.63          1.80        1.7704    3   1   1         6
                51.63          8.87        1.7704    4  -1   1         6
                56.15          6.93        1.6381    2   0   3         6
                57.19          1.49        1.6108    4   0   1         6
                57.69         15.54        1.5979    4  -2   2         3
                57.69          5.27        1.5979    2   2   2         3
                59.46          1.48        1.5546    3   1   2         6
                59.46          1.55        1.5546    4  -1   2         6
                59.96          4.06        1.5427    3   2   0         6
                61.43          7.07        1.5093    3  -1   3         6
                61.43          1.10        1.5093    2   1   3         6
                62.42          1.87        1.4879    5  -2   1         6
                62.42         38.12        1.4879    3   2   1         6
                63.38          1.44        1.4674    4   1   0         6
                64.81         25.39        1.4386    3   0   3         6
                65.76         21.23        1.4200    5  -1   1         6
                65.76          1.69        1.4200    4   1   1         6
                66.46         13.81        1.4069    0   0   4         1
                68.09          3.35        1.3771    1   0   4         6
                69.48         17.40        1.3528    3   2   2         6
                69.48         15.49        1.3528    5  -2   2         6
                69.95          1.09        1.3449    5   0   0         6
                71.30          3.51        1.3227    2  -1   4         3
                71.31          3.51        1.3226    4  -1   3         6
                71.31          2.54        1.3226    3   1   3         6
                72.22          3.62        1.3081    5   0   1         6
                72.67         11.07        1.3011    4   1   2         6
                72.67          5.10        1.3011    5  -1   2         6
                72.88          4.46        1.2978    2   0   4         6
                73.12          9.92        1.2942    3   3   0         3
                74.69          3.15        1.2708    4   2   0         6
                76.02          1.04        1.2520    4   0   3         6
                76.91          4.49        1.2396    6  -2   1         6
                76.91          2.45        1.2396    4   2   1         6
                77.56          4.71        1.2309    3  -1   4         6
                77.56          3.05        1.2309    2   1   4         6
                78.89          2.70        1.2134    5   0   2         6
                79.33          2.95        1.2078    5   1   0         6
                80.63         11.46        1.1915    5  -2   3         6
                80.63          2.76        1.1915    3   2   3         6
                81.51          4.11        1.1809    5   1   1         6
                83.46          2.74        1.1582    6  -2   2         6
                83.46          1.23        1.1582    4   2   2         6
                83.67          7.10        1.1558    4   1   3         6
                86.69          1.35        1.1232    3   1   4         6
                87.99          1.18        1.1099    6  -1   2         6
                87.99          2.54        1.1099    5   1   2         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.