Abstract
AbstractThe layered nanocrystalline sodium manganese phosphate was synthesized by low‐heating solid state reaction using MnSO4·H2O and Na3PO4·12H2O as raw materials. The resulting sodium manganese phosphate and its calcined products were characterized using element analysis, thermogravimetry and differential thermal analyses (TG/DTA), Fourier transform IR (FT‐IR), X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), ultraviolet‐visible (UV‐Vis) absorption spectroscopy, and magnetic susceptibility. The results showed that the product obtained at 70°C for 3 h, NaMnPO4·3H2O, was a layered compound, and its crystallite size and interlayer distance were 27 nm and 1.124 nm, respectively. The thermal process of NaMnPO4·3H2O between room temperature and 700°C experienced three steps, the dehydration of the one adsorption water at first, and then dehydration of the two crystal waters, at last crystallization of NaMnPO4. Magnetic susceptibility measurements of NaMnPO4· 3H2O from room temperature to 2.5 K point to ferrimagnetic ordering at TN‐35 K.
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