Abstract
Preparation of the alkaline earth tungstate films such as Ba 1− x Sr x WO 4 and Ba 1− x Ca x WO 4 on the tungsten substrate was studied with a simple solution process assisted with the ball rotation at room temperature. The solid solution formation and limitations, the effect of oxidizing agent H 2O 2 and alkaline earth ions concentration on the dissolution of W substrate and the growth of Ba 1− x Sr x WO 4 and Ba 1− x Ca x WO 4 films were studied in detail. The ball rotation assistance plays a very important role to enhance the dissolution of the W substrate and mass transport of the reactant species such as alkaline earth ions and WO 4 2− ions onto the solid/solution interface region, where precipitation occurs. Therefore, the rate of film formation was accelerated by the ball rotation assistance to the reaction system. Ba-rich Ba 1− x Sr x WO 4 and Ba 1− x Ca x WO 4 films were formed without high energy or high temperature treatment.
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