Simple synthesis, kinetics and thermodynamics of rod-like Cu2(OH)PO4 microparticles and rod-like Cu4O(PO4)2 nanoparticles

Rod-like Cu-2(OH)PO4 microparticles were synthesized via a simple wet chemical reaction by mixing the solutions of CuSO4 center dot 5H(2)O and Na3PO4 center dot 12H(2)O at 90 degrees C for 24 h. Thermal transformation of the prepared Cu-2(OH)PO4 microparticles were related to endothermic dehydroxylation and its final decomposed product rod-like Cu4O(PO4)(2) nanoparticles were obtained. The XRD results indicated that Cu-2(OH)PO4 and Cu4O(PO4)(2) crystallize orthorhombic (space group Pnnm, D-2h(12)) and triclinic (space group P (1) over bar, C-i(1)) phases, respectively. The thermal transformation mechanisms from Cu-2(OH)PO4 to Cu4O(PO4)(2) were expressed thought the relation of the graphical shape of isothermal combined with the non-isothermal multi-heating rate equation and kinetic models (P-3/2 and R-2) to discuss the change of morphologies from microparticles to nanoparticles. Kinetic parameters and triplet thermodynamic functions of activated compound were determined and fully discussed. The obtained data will be useful for academic scientists and industrial researchers to apply these copper phosphates for special applications.