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To achieve significant reduction of dielectric loss and enhancement of dielectric tunability for actual applications, a Ba0.51Sr0.34TiO3 film modified by Y/Mn alternate doping (Y/Mn-BST0.85) is prepared by an improved sol-gel method, where the film is composed of 12 layers, and odd number layers are preheated. For comparison, BST0.85, Y-BST0.85 and Mn-BST0.85 films are also prepared. XRD shows four...