NH4H2PO4
      Baur W H
      Acta Crystallographica B29 (1973) 2726-2731
      Reconstruction of local atomic environments in the disordered
      hydrogen-bonded crystal structures of paraelectric ammonium
      dihydrogen phosphate and potassium dihydrogen phosphate
      Note: polymorph of biphosphammite
      _database_code_amcsd 0009496

      CELL PARAMETERS:    7.4997   7.4997   7.5493   90.000   90.000   90.000
      SPACE GROUP: P2_12_12_1
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    424.614
      Density (g/cm3):      1.799
      MAX. ABS. INTENSITY / VOLUME**2:      13.25785391    
      RIR:      2.400
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.47        100.00        4.3394    1   1   1         4
                23.57         28.62        3.7747    0   0   2         2
                23.73         27.81        3.7499    0   2   0         2
                23.73         28.35        3.7499    2   0   0         2
                29.13          2.47        3.0651    1   2   1         4
                33.69         14.60        2.6603    2   0   2         4
                33.69         14.51        2.6603    0   2   2         4
                33.80          9.40        2.6515    2   2   0         4
                35.81          3.23        2.5072    2   1   2         4
                37.91          1.54        2.3732    3   0   1         4
                39.64          3.68        2.2735    1   1   3         4
                39.84          3.32        2.2626    1   3   1         4
                39.84          3.29        2.2626    3   1   1         4
                41.62         32.12        2.1697    2   2   2         4
                43.42          2.84        2.0842    0   3   2         4
                45.22          1.15        2.0053    3   2   1         4
                50.15          1.31        1.8189    4   1   0         4
                51.69          1.41        1.7683    1   4   1         4
                53.06          4.71        1.7259    1   3   3         4
                53.06          4.63        1.7259    3   1   3         4
                53.22          1.98        1.7211    3   3   1         4
                54.42          1.78        1.6858    2   0   4         4
                54.42          1.83        1.6858    0   2   4         4
                54.66          2.09        1.6792    0   4   2         4
                54.66          2.07        1.6792    4   0   2         4
                54.74          1.46        1.6770    2   4   0         4
                54.74          1.51        1.6770    4   2   0         4
                60.18          4.72        1.5376    2   2   4         4
                60.40          3.51        1.5325    4   2   2         4
                60.40          3.47        1.5325    2   4   2         4
                64.41          1.00        1.4465    3   3   3         4
                70.84          3.17        1.3301    4   0   4         4
                70.84          3.25        1.3301    0   4   4         4
                71.11          2.06        1.3258    4   4   0         4
                74.50          1.54        1.2737    1   3   5         4
                74.50          1.50        1.2737    3   1   5         4
                74.89          1.38        1.2679    3   5   1         4
                74.89          1.38        1.2679    5   3   1         4
                75.90          2.19        1.2536    4   2   4         4
                75.90          2.23        1.2536    2   4   4         4
                76.09          1.97        1.2509    4   4   2         4
                81.10          1.12        1.1858    2   6   0         4
                81.10          1.10        1.1858    6   2   0         4
                85.40          2.05        1.1367    2   2   6         4
                85.91          1.32        1.1313    2   6   2         4
                85.91          1.31        1.1313    6   2   2         4
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.