Direct fabrication of crystalline vanadates films by hydrothermal-electrochemical method

Lithium vanadate films have been prepared on vanadium metal substrates usin g lithium hydroxide aqueous solutions in the autoclave by the hydrothermal- electrochemical method. The X-ray diffraction pattern of the fabricated fil m showed a single phase of stoichiometric crystalline orthorhombic beta II- Li3VO4 without any other impurity phases. As an application of this method, we have demonstrated the direct fabrication of europium doped yvo(4) films on vanadium substrate for luminescent materials using hydrothermal-electro chemical method. Those films showed sufficient intensity of luminescent pro perty at room temperature. Therefore, this processing route may serve as an inexpensive and environmentally friendly way of the direct fabrication of the vanadate films with controlled crystal morphology and size simply by ch anging synthesis parameters. (C) 2001 Editions scientifiques et medicales E lsevier SAS. AII rights reserved.