Efficient Microwave Irradiation‐Assisted Hydrothermal Synthesis of Ammonium Vanadate Flake

Abstract

The major factors and affection for hydrothermal synthesis of ammonium vanadate in microwave irradiation was investigated and optimized. The obtained material was a pure (NH 4 ) 2 V 6 O 16 phase with regular spindle and rhombic crystal shapes. Transmission electron microscope and selected-area electron diffraction patterns confirmed that the microwave irradiation-assisted hydrothermal treatments altered the growth pattern and expanded the [-1 0 0] interplanar spacing by approximately ß8%-12% compared to the standard powder diffraction file data.

A novel method of preparing vanadium-based precursors and their enhancement mechanism in vanadium nitride preparation

“…While exceeded 30 min, as water evaporates, other impurity ions such as SO 4 2− and Na + were crystallized and mixed with the vanadium precipitation product. 40 The precursor has low purity, resulted a low N content in vanadium nitride. As shown in Fig.…”

“…As the temperature is increased, the water evaporates and a large number of voids appear in the precursor, with a narrow contact area with N 2 and a lack of Table 2 Thermodynamics analysis data of calcination deamination process and Na + were crystallized and mixed with the vanadium precipitation product. 40 The precursor has low purity, resulted a low N content in vanadium nitride. As shown in Fig.…”