F Nb2 O5 Tl
      Fourquet J, Jacoboni C, de Pape R
      Materials Research Bulletin 8 (1973) 393-404
      Les Pyrochlores A B2 X6. Mise en evidence de l'occupation par le cation
      A de nouvelles positions cristallographiques dans les groupe d'espace Fd3m
      _cod_database_code 1000494
      _database_code_amcsd 0014230

      CELL PARAMETERS:   10.5060  10.5060  10.5060   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1159.610
      Density (g/cm3):      5.603
      MAX. ABS. INTENSITY / VOLUME**2:      167.9954432    
      RIR:      9.762
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                23.96         36.54        3.7144    2   2   0        12
                28.17        100.00        3.1677    3   1   1        24
                29.45         34.09        3.0328    2   2   2         8
                37.31          1.16        2.4102    3   3   1        24
                42.14          2.03        2.1445    4   2   2        24
                44.83          9.05        2.0219    5   1   1        24
                44.83          6.70        2.0219    3   3   3         8
                49.05         23.20        1.8572    4   4   0        12
                51.46          6.44        1.7758    5   3   1        48
                52.24          1.65        1.7510    4   4   2        24
                57.52         11.60        1.6021    5   3   3        24
                58.25          5.96        1.5838    6   2   2        24
                61.11          1.33        1.5164    4   4   4         8
                63.21          1.68        1.4711    5   5   1        24
                63.21          2.83        1.4711    7   1   1        24
                68.62          5.35        1.3678    7   3   1        48
                73.83          1.95        1.2835    7   3   3        24
                74.47          2.38        1.2740    6   4   4        24
                77.02          1.47        1.2381    8   2   2        24
                79.54          8.01        1.2051    6   6   2        24
                82.04          4.43        1.1746    8   4   0        24
                83.90          2.69        1.1532    9   1   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.