Spinel
      Redfern S A T, Harrison R J, O'Neill H St C, Wood D R R
      American Mineralogist 84 (1999) 299-310
      Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 C
      from in situ neutron diffraction
      Data collected at IPNS, Argonne National Laboratory,
      T = 1557 K on cooling cycle, Mg.99Al2O4
      _database_code_amcsd 0002183

      CELL PARAMETERS:    8.1830   8.1830   8.1830   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    547.944
      Density (g/cm3):      3.449
      MAX. ABS. INTENSITY / VOLUME**2:      17.05260708    
      RIR:      1.610
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.78         27.50        4.7245    1   1   1         8
                30.91         32.22        2.8931    2   2   0        12
                36.41        100.00        2.4673    3   1   1        24
                38.10          1.21        2.3622    2   2   2         8
                44.28         54.34        2.0457    4   0   0         6
                54.97          8.43        1.6703    4   2   2        24
                58.62          3.33        1.5748    3   3   3         8
                58.62         34.97        1.5748    5   1   1        24
                64.41         61.16        1.4466    4   4   0        12
                67.75          2.42        1.3832    5   3   1        48
                73.14          2.45        1.2938    6   2   0        24
                76.31          7.80        1.2479    5   3   3        24
                81.49          5.21        1.1811    4   4   4         8
                84.57          1.68        1.1458    5   5   1        24
                89.66          3.24        1.0935    6   4   2        48
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.