Sodium
      Barrett C S
      Acta Crystallographica 9 (1956) 671-677
      X-ray study of the alkali metals at low temperatures
      Locality: synthetic
      Sample: at T = 5 K
      Note: lattice parameters are average of 4 values
      _database_code_amcsd 0009182

      CELL PARAMETERS:    3.7670   3.7670   6.1540   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     75.627
      Density (g/cm3):      1.009
      MAX. ABS. INTENSITY / VOLUME**2:      10.95395146    
      RIR:      3.533
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.34         23.70        3.2623    1   0   0         6
                29.02         26.82        3.0770    0   0   2         2
                31.03        100.00        2.8824    1   0   1        12
                40.29         15.03        2.2384    1   0   2        12
                48.32         16.00        1.8835    1   1   0         6
                52.71         17.30        1.7366    1   0   3        12
                56.41          2.21        1.6312    2   0   0         6
                57.36         16.52        1.6064    1   1   2        12
                58.54         11.40        1.5767    2   0   1        12
                60.14          2.27        1.5385    0   0   4         2
                64.68          2.51        1.4412    2   0   2        12
                67.29          2.12        1.3915    1   0   4        12
                74.29          4.17        1.2767    2   0   3        12
                79.23          2.12        1.2090    2   1   1        24
                80.63          3.95        1.1915    1   1   4        12
                84.05          2.51        1.1516    1   0   5        12
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.