Na0.82 Nb2 O6.76 U0.45
      Chevalier R, Gasperin M
      Acta Crystallographica B28 (1972) 985-986
      Mise en evidence d'une transformation ordre-desordre dans un cristal de
      type pyrochlore.
      _cod_database_code 1001183
      _database_code_amcsd 0009430

      CELL PARAMETERS:   10.4000  10.4000  10.4000   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1124.864
      Density (g/cm3):      4.959
      MAX. ABS. INTENSITY / VOLUME**2:      128.9501399    
      RIR:      8.468
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.75         19.32        6.0044    1   1   1         8
                28.46          8.42        3.1357    3   1   1        24
                29.76        100.00        3.0022    2   2   2         8
                34.50         27.45        2.6000    4   0   0         6
                42.59          1.16        2.1229    4   2   2        24
                45.31          3.20        2.0015    3   3   3         8
                49.58         40.96        1.8385    4   4   0        12
                52.02          1.40        1.7579    5   3   1        48
                58.17          1.43        1.5860    5   3   3        24
                58.90         35.61        1.5679    6   2   2        24
                61.80          9.44        1.5011    4   4   4         8
                63.93          1.35        1.4563    5   5   1        24
                69.41          1.45        1.3540    7   3   1        48
                72.74          5.23        1.3000    8   0   0         6
                80.51         12.22        1.1930    6   6   2        24
                83.06         10.53        1.1628    8   4   0        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.