Potassium
      Liu L
      Journal of Physics and Chemistry of Solids 47 (1986) 1067-1072
      Compression and polymorphism of potassium to 400 Kbar
      Locality: synthetic
      Sample: fcc at P = 16.8 GPa
      _database_code_amcsd 0013234

      CELL PARAMETERS:    4.9730   4.9730   4.9730   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    122.986
      Density (g/cm3):      2.111
      MAX. ABS. INTENSITY / VOLUME**2:      40.58917891    
      RIR:      6.260
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                31.15        100.00        2.8712    1   1   1         8
                36.12         46.96        2.4865    2   0   0         6
                52.01         25.27        1.7582    2   2   0        12
                61.88         25.31        1.4994    3   1   1        24
                64.96          6.94        1.4356    2   2   2         8
                76.64          2.74        1.2433    4   0   0         6
                85.02          7.67        1.1409    3   3   1        24
                87.78          6.96        1.1120    4   2   0        24
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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.