Patent ID: 7467447
Filing Date: 2008-12-23
Classification: H03H,Y10T

Abstract:
1. A method for preparing a surface acoustic wave device, comprising: furnishing a lithium tantalate or lithium niobate piezoelectric single crystal substrate by slicing a substrate material having axes X and Y such that a plane containing axis X and perpendicular to a new axis Y obtained by rotating axis Y about axis X of the axes by an angle of 33°±9° becomes a substrate surface, and forming, as electrodes on said substrate surface, in order a titanium nitride layer by sputtering and depositing titanium on the substrate surface while feeding nitrogen gas and argon gas, and an aluminum layer thereon by sputtering and depositing pure aluminum thereon while feeding argon gas alone; wherein the aluminum layer has a crystal face (311) which is inclined at an angle of 9°±9° with respect to the substrate surface of said piezoelectric single crystal substrate.