Synthesis of Layered Sodium Manganese Phosphate via Low‐heating Solid State Reaction and Its Properties

Abstract

Abstract The layered nanocrystalline sodium manganese phosphate was synthesized by low‐heating solid state reaction using MnSO 4 ·H 2 O and Na 3 PO 4 ·12H 2 O 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, NaMnPO 4 ·3H 2 O, was a layered compound, and its crystallite size and interlayer distance were 27 nm and 1.124 nm, respectively. The thermal process of NaMnPO 4 ·3H 2 O 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 NaMnPO 4 . Magnetic susceptibility measurements of NaMnPO 4 · 3H 2 O from room temperature to 2.5 K point to ferrimagnetic ordering at T N ‐35 K.