Crystal data for three new ammonium potassium pyrophosphates | Zendy

Waerstad K. R. | Zendy; Frazier A. W. | Zendy

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Crystal data for three new ammonium potassium pyrophosphates

Author(s) -

Waerstad K. R.,

Frazier A. W.

Publication year - 1980

Publication title -

journal of applied crystallography

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.429

H-Index - 162

ISSN - 1600-5767

DOI - 10.1107/s0021889880012903

Subject(s) - triclinic crystal system , orthorhombic crystal system , monoclinic crystal system , potassium , salt (chemistry) , crystallography , chemistry , group (periodic table) , ammonium , powder diffraction , crystal structure , inorganic chemistry , organic chemistry

Unit‐cell parameters and space groups have been determined for three ammonium potassium pyrophosphates. The compound (NH 4 , K) 2 H 2 P 2 O 7 is triclinic with space group P 1 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 (NH 4 , K) 2 H 2 P 2 O 7 .0.5H 2 O is orthorhombic with space group Pnma or Pna 2 1 , and a = 19.22 (2), b = 7.64 (1), c = 10.39 (1) Å, Z = 8. The tribasic salt (NH 4 , K) 3 HP 2 O 7 .H 2 O is monoclinic with space group Cc or C 2/ 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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