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In the surface acoustic waves industry different crystal cuts of piezoelectric materials are used, e.g. 128ᵒ YX LiNbO3, AT&ST quartz, 42ᵒ YX LiTaO3, etc. Direct data isn’t available for all cuts. The standard approach is to use the so-called Euler angle rotation. COMSOL supports it via the Rotated System functionality. When performing such a rotation, one should keep in mind that it’s inherently 3D, therefore some extra manipulations might be needed for different orientations of piezo crystals in geometry.

Here, some special 2D & 3D cases conversion from the default “Lithium Niobate” material to “128 YX cut LiNbO3” are demonstrated on a simple piezoelectric unit cell. Verification is performed for a simple unit cell model aiming to obtain SAW eigenfrequencies and a typical SAW velocity.