2009 Volume 23 Pages 67-75
Chemical preparation, thermal behavior, kinetic and IR studies and quantum chemical calculations are given for the cyclotriphosphate Ba3(P3O9)26H2O. Ba3(P3O9)26H2O is triclinic P-1 with the following unit-cell dimensions : a = 7.547(4)Å, b = 11.975(6))Å, c = 13.068(8))Å, α= 108.58(8)°, β= 100.35(8)°, γ= 95.54(8)°, Z = 2. Ba3(P3O9)26H2O has never been studied except its crystallographic characterization. Ba3(P3O9)26H2O is stable, in the conditions of temperature and pressure of our laboratory, until 80°C. It is impossible to dehydrate Ba3(P3O9)26H2O without breaking its rings P3O93- and leading to amorphous compounds in X-ray diffraction and IR absorption spectrometry. The final product of the dehydration and calcination of Ba3(P3O9)26H2O, under atmospheric pressure, is its long chain polyphosphate form β, β [Ba(PO3)2]∞. β [Ba(PO3)2]∞ is stable until its melting point at 870°C. β [Ba(PO3)2]∞ is prepared otherwise by dry way. β [Ba(PO3)2]∞ has many applications in industry such as corrosion inhibitor.
