Yttrium
      Spedding F H, Daane A H, Herrmann K W
      Acta Crystallographica 9 (1956) 559-563
      The crystal structures and lattice parameters of high-purity scandium,
      yttrium and the rare earth metals
      Locality: synthetic
      Note: sample 99.4% pure
      _database_code_amcsd 0009166

      CELL PARAMETERS:    3.6474   3.6474   5.7306   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     66.023
      Density (g/cm3):      4.471
      MAX. ABS. INTENSITY / VOLUME**2:      170.4551353    
      RIR:     12.412
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.25         24.31        3.1587    1   0   0         6
                31.22         24.61        2.8653    0   0   2         2
                32.36        100.00        2.7663    1   0   1        12
                42.60         14.53        2.1223    1   0   2        12
                50.01         17.03        1.8237    1   1   0         6
                56.28         16.84        1.6346    1   0   3        12
                58.43          2.45        1.5794    2   0   0         6
                60.14         17.65        1.5385    1   1   2        12
                60.84         12.69        1.5226    2   0   1        12
                65.11          2.20        1.4326    0   0   4         2
                67.75          2.85        1.3832    2   0   2        12
                72.44          2.24        1.3047    1   0   4        12
                78.60          5.05        1.2172    2   0   3        12
                82.54          2.87        1.1688    2   1   1        24
                86.36          5.00        1.1266    1   1   4        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.