Fabrication of AMoO4 (A = Ba, Sr) film on Mo substrate by solution reaction assisted ball-rotation

Alkaline earth molybdates, such as BaMoO₄ and SrMoO₄, films have been successfully fabricated on a Mo metal substrate in AOH (A = Ba, Sr) solutions by a ball-rotation-assisted solution reaction, at room temperature. The dissolution of Mo was mainly controlled by the concentration of the H₂O₂ oxidizing agent and ball-rotation to form MoO₄²⁻ in the solution. AMoO₄ was deposited on the substrate by the reaction between MoO₄²⁻ and A²⁺ ions without any high energy or high-temperature treatment. Also, the mass transport of alkaline earth ions onto the solid/solution interface was improved as a result of the vigorous solution agitation by the ball-rotation. Therefore, the rate of deposition of the AMoO₄ films was accelerated by the ball-rotation. A decrease in the grain size of the film was observed with an excessive ball-rotation.