Structural modifications from NiNa3P3O10•12H2O toNiNa3P3O10 new triphosphate during dehydration process
2015 年 30 巻 p. 1-7
詳細
2015 年 30 巻 p. 1-7
A nickel-sodium triphosphate NiNa3P3O10•12H2O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA) and infrared spectrometry which show the characteristic bands of a triphosphate P3O105-. The results of the compound heated at different temperatures showed that, after dehydration, NiNa3P3O10•12H2O decomposes into an amorphous compound, then it crystallizes at 700°C in order to give the new triphosphate NiNa3P3O10. NiNa3P3O10 crystallizes in the hexagonal system, space group P-31c, Z = 2 with the following unit-cell dimensions: a = b = 13.310(5) Å, c = 9.551(8) Å, M(20) = 80, F(20) = 93 (0.0028; 77) and V = 1465.58(0) Å3. NiNa3P3O10 is stable until its melting point at 744°C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P3O10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of NiNa3P3O10•12H2O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed crystalline structure.
