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

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 ℃ 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 ℃ 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.

Investigation of Morphology, Optical and Electronic Ac Conduction of the Olivine Manganite Compound: NaMnPO4

“…The effective magnetic moment μeff estimated from the Curie constant is equal to 5.79 μB, wich is close to the spin only value of 5.92 μB expected for a high‐spin Mn 2+ (d5) ion [48] …”

“…[47] The effective magnetic moment μeff estimated from the Curie constant is equal to 5.79 μB, wich is close to the spin only value of 5.92 μB expected for a high-spin Mn 2 + (d5) ion. [48] Figure 9 illustrates the magnetization (M) vs.applying magnetic field (H) investigated for NaMnPO 4 at various temperatures. Distinct magnetic states exist, as indicated by the M(H) curve.…”

Synergy of Surface Phosphates and Oxygen Vacancies Enables Efficient Photocatalytic Methane Conversion at Room Temperature

“…The result of FT-IR spectra also confirms the presence of phosphate species on TiO 2 –P (Figure S5). The strong bands at 3448 and 1647 cm –1 can be due to the surface hydroxyl groups. , The enlarged spectrum for TiO 2 –P clearly displays two bands located at 1127 and 1020 cm –1 that are assigned to the symmetric stretching vibration of O–P–O and P–O bonds in PO 4 3– , respectively. − …”

“…The strong bands at 3448 and 1647 cm −1 can be due to the surface hydroxyl groups. 41,42 The enlarged spectrum for TiO S1. 22 As shown in Figure 3a, HCHO is the main product for all catalysts, and neither CO nor H 2 was detected in the gas product.…”

Gradual Development of Maricite NaMnPO4 with the Influence of Diol Chain Length on the Polyol Process of Surpassed Sodium Intercalation

“…8 In this context, NaMnPO 4 is employed to serve as a cathode material for sodium-ion batteries. In accordance with the literature, this material has been synthesized by the hydrothermal method, 9 low-heating solid-state reaction, 10 phosphate-formate precursor method, 11 topochemical synthesis, 12 solution combustion process, 13 and ion-exchange reaction. 14 Although being synthesized by all of these methods, achieving good electrochemical performance of the material still remains a herculean task.…”