Controllable synthesis of -MnVO microtubes and hollow microspheres

Abstract

?-Mn₂V₂O₇ microtubes with a length of 15–25 ?m, 2.5–3.5 ?m external diameter, and ∼ 0.4 ?m wall thickness, as well as ?-Mn₂V₂O₇ hollow microspheres with an average outer diameter of 2 ?m, were successfully synthesized in a suitable molar ratio of NH₄VO₃ and MnCO₃ powders via a hydrothermal process. X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize the products, and the magnetic susceptibility curve was also measured. In the whole process, the concentration of Mn²⁺ cations derived from MnCO₃ dissolution plays a crucial role in the formation of ?-Mn₂V₂O₇ microtubes and hollow microspheres.

Keywords

vanadate / microtubes / hollow microspheres