Mechanochemical Synthesis of Silver Vanadate and Silver Chromate Amorphous Superionic Conductors

摘要

The work presents the results of investigation of materials obtained in the AgI-Ag₂O-M_xO_y (M_xO_y = V₂O₅, CrO₃) systems by means of mechanosynthesis. The Xray diffraction and field emission scanning electron microscopy methods were employed in the investigations. The milling speed, apart from the milling time, appeared to be a key factor for the effectiveness of the formation of the amorphous chromate and vanadate materials. The model of the synthesis process is discussed and suggested. During initially stages of milling Ag₂O and chromium or vanadium oxides react together forming some new phases. Then this intermediate products act as a solid solvent dissolving in itself silver iodide component of the mixture forming finally an amorphous phase.