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crystal data
Unit-cell parameters and space groups have been determined for three ammonium potassium pyrophosphates. The compound (NH4, K)2H2P2O7 is triclinic with space group P1 or 
1, and a = 7.950 (3), b = 7.270 (3), c = 7.184 (3) Å, α = 90.89 (4), β = 117.61 (3), γ = 81.56 (4)°, Z = 2. The hydrated salt (NH4, K)2H2P2O7.0.5H2O is orthorhombic with space group Pnma or Pna21, and a = 19.22 (2), b = 7.64 (1), c = 10.39 (1) Å, Z = 8. The tribasic salt (NH4, K)3HP2O7.H2O is monoclinic with space group Cc or C2/c. The X-ray data show that a = 19.41 (2), b = 6.158 (6), c = 16.90 (2) Å, β = 107.5 (1)°, Z = 8. The indexed powder diffraction patterns are given for the three salts.
1, and a = 7.950 (3), b = 7.270 (3), c = 7.184 (3) Å, α = 90.89 (4), β = 117.61 (3), γ = 81.56 (4)°, Z = 2. The hydrated salt (NH4, K)2H2P2O7.0.5H2O is orthorhombic with space group Pnma or Pna21, and a = 19.22 (2), b = 7.64 (1), c = 10.39 (1) Å, Z = 8. The tribasic salt (NH4, K)3HP2O7.H2O is monoclinic with space group Cc or C2/c. The X-ray data show that a = 19.41 (2), b = 6.158 (6), c = 16.90 (2) Å, β = 107.5 (1)°, Z = 8. The indexed powder diffraction patterns are given for the three salts.
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