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The crystal structure of CaNH 4 P 3 O 9 , determined by use of the Patterson method, is a monoclinic deformation of the orthorhombic form: MgNH 4 P 3 O 9 . Trimetaphosphate ring (P 3 O 9 ) 3−  has a “cis” configuration. Crystallographic features are given for three condensed phosphates: CaKP 3 O 9  and CaCsP 3 O 9  isotypic with MgNH 4 P 3 O 9  and CaNH 4 P 3 O 9  · 3H 2 O isotypic with CaNaP 3 O 9  · 3H 2 O.

Structure cristalline du trimétaphosphate CaNH 4 P 3 O 9 Trimétaphosphates: CaKP 3 O 9 , CaCsP 3 O 9 et CaNH 4 P 3 O 9 , 3H 2 O