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Wu Xue-hang, Wu Wenwei, Liao Sen, Fan Yanjin, Li Shushu (2009)
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The single phase NH4NiPO4·6H2O was synthesized by solid‐state reaction at room temperature using NiSO4·6H2O and (NH4)3PO4·3H2O as raw materials. The NH4NiPO4·6H2O and its calcined products were characterized using X‐ray powder diffraction (XRD), thermogravimetry and differential thermal analyses (TG/DTA), Fourier transform IR (FT‐IR), ultraviolet‐visible (UV‐vis) absorption spectroscopy, and scanning electron microscopy (SEM). The results showed that the product dried at 80°C for 3 h was orthorhombic NH4NiPO4·6H2O [space group Pmm2(25)], and surfactant polyethylene glycol (PEG)‐400 can direct growth of crystal NH4NiPO4·6H2O. The thermal process of NH4NiPO4·6H2O experienced three steps, which involve the dehydration of the five crystal water molecules at first, and then deamination, dehydration of the one crystal water, intramolecular dehydration of the protonated phosphate groups together, at last crystallization of Ni2P2O7. The product of thermal decomposition at 150°C for 2 h, orthorhombic NH4NiPO4·H2O, is layered compound with an interlayer distance of 0.8370 nm.
Chinese Journal of Chemistry – Wiley
Published: Dec 1, 2010
Keywords: ; ; ;
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