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 = 1232 K on heating cycle, Mg.99Al2O4
      _database_code_amcsd 0002173

      CELL PARAMETERS:    8.1574   8.1574   8.1574   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    542.815
      Density (g/cm3):      3.481
      MAX. ABS. INTENSITY / VOLUME**2:      17.56577767    
      RIR:      1.643
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.84         28.83        4.7097    1   1   1         8
                31.01         32.29        2.8841    2   2   0        12
                36.53        100.00        2.4595    3   1   1        24
                38.22          1.19        2.3548    2   2   2         8
                44.42         55.38        2.0393    4   0   0         6
                55.16          8.62        1.6651    4   2   2        24
                58.82          3.29        1.5699    3   3   3         8
                58.82         37.24        1.5699    5   1   1        24
                64.63         64.52        1.4420    4   4   0        12
                67.99          2.70        1.3788    5   3   1        48
                73.41          2.55        1.2898    6   2   0        24
                76.59          8.44        1.2440    5   3   3        24
                81.80          5.76        1.1774    4   4   4         8
                84.89          2.00        1.1423    5   5   1        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.