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Chemical preparation, crystallographic characterization, IR studies and thermal behavior are presented for the new cyclotriphosphate CaNH 4 P 3 O 9  · H 2 O and its anhydrous form CaNH 4 P 3 O 9 . CaNH 4 P 3 O 9  · H 2 O was prepared by the method of ion exchange resin. CaNH 4 P 3 O 9  · H 2 O crystallizes hexagonal, space group is P6 3  or P6 3 /m or P6 3 22 with the following unit-cell dimensions:  a  =  b  = 14.75(2) Å,  c  = 9.934(3) Å and Z = 8. The total dehydration of CaNH 4 P 3 O 9  · H 2 O, between 70 °C and 180 °C, leads to its anhydrous form CaNH 4 P 3 O 9 . CaNH 4 P 3 O 9  crystallizes in the monoclinic space group P2 1 /n, Z = 4, with the following unit-cell dimensions:  a  = 7.446 Å,  b  = 12.46 Å,  c  = 10.050 Å, β = 90.11° and Z = 4. CaNH 4 P 3 O 9  · H 2 O is stable until its melting point at 1050 °C. The thermal behavior of CaNH 4 P 3 O 9  · H 2 O was investigated and interpreted by comparison with IR absorption spectrometry and X-ray diffraction experiments.

Chemical preparation, crystallographic characterization, vibrational study and thermal behavior of a new cyclotriphosphate CaNH 4 P 3 O 9 · H 2 O