Bi0.5 O7 P2 Ta0.5
      Oyetola S, Verbaere A, Guyomard D, Crosnier M, Piffard Y, Tournoux M
      European Journal of Solid State and Inorganic Chemistry 28 (1991) 23-36
      New ZrP2O7-like diphosphates of either mixed
      (M^III^1/2M'^V^1/2) cations (M=Sb,Bi,Nd,Eu;M'=Sb, Nb,Ta) or M'^V^
      cations (M'=Ta,Nb):synthesis and structure
      _cod_database_code 1000327
      _database_code_amcsd 0012540

      CELL PARAMETERS:    8.2530   8.2530   8.2530   90.000   90.000   90.000
      SPACE GROUP: Pa3       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    562.128
      Density (g/cm3):      4.358
      MAX. ABS. INTENSITY / VOLUME**2:      135.3445475    
      RIR:     10.111
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.62         69.51        4.7649    1   1   1         8
                21.53        100.00        4.1265    2   0   0         6
                24.11         10.86        3.6909    2   1   0        12
                26.45         10.91        3.3693    2   1   1        24
                30.64         44.90        2.9179    2   2   0        12
                36.10         56.53        2.4884    3   1   1        24
                37.76         12.75        2.3824    2   2   2         8
                39.36          1.66        2.2890    3   0   2        12
                43.88          8.15        2.0633    4   0   0         6
                45.31          1.77        2.0016    4   1   0        12
                46.70          1.65        1.9453    4   1   1        24
                48.05         18.83        1.8934    3   3   1        24
                49.38         16.07        1.8454    4   0   2        12
                49.38         12.69        1.8454    4   2   0        12
                54.47         21.31        1.6846    4   2   2        24
                58.07          3.90        1.5883    3   3   3         8
                58.07         19.55        1.5883    5   1   1        24
                63.80          8.49        1.4589    4   4   0        12
                67.09          6.04        1.3950    5   3   1        24
                67.09          6.70        1.3950    5   1   3        24
                68.18         10.17        1.3755    4   4   2        24
                72.42          3.12        1.3049    6   0   2        12
                72.42          2.52        1.3049    6   2   0        12
                75.55          5.53        1.2586    5   3   3        24
                76.58          6.40        1.2442    6   2   2        24
                80.66          1.02        1.1912    4   4   4         8
                83.69          1.52        1.1557    5   5   1        24
                83.69          3.04        1.1557    7   1   1        24
                84.69          2.60        1.1445    6   0   4        12
                84.69          2.85        1.1445    6   4   0        12
                88.70          3.49        1.1029    6   2   4        24
                88.70          4.24        1.1029    6   4   2        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.