An alkaline earth molybdates and tungstates, such as AMoO4 and AWO4, films have been successfully fabricated on the respective metal substrate in AOH (A = Ba, Sr, Ca) solutions by a ball rotation-assisted solution reaction at room temperature. This film consists the polyhedral crystals of AMO4 with an average grain size of 8 μm. The dissolution of substrate surface was mainly controlled by the concentration of H2O2 oxidizing agent and ball rotation to form MO 4 2 - in the solution. AMO4 was deposited on the substrate by the reaction between MO4 2 - and A 2 + ions without any high energy or high temperature treatment. Also, the mass transport of alkaline earth ions on to the solid/solution interface was improved as a result of the vigorous solution agitation by the ball rotation. Therefore, the deposition rate of the AMO4 films was accelerated by the ball rotation. A decrease in the grain size of the film was observed incase of an excessive ball rotation.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Mechanics of Materials
- Electrical and Electronic Engineering
- Materials Chemistry