Piezoelectric wafer and method of fabricating the same and acoustic wave device including the same

Abstract

A piezoelectric wafer comprises a center region and an edge region. The piezoelectric wafer has a color difference (ΔE) of no greater than 3. The color difference (ΔE) is expressed by ΔE=√{square root over ((Lmax−Lmix)2)} where the color difference (ΔE) is obtained from multiple chromaticity values (L) measured at several evenly distribution areas selected from a central region and an edge region of the piezoelectric wafer, (Lmax) is a maximum value of the chromaticity values (L), and (Lmin) is a minimum value of the chromaticity values (L). A method of fabricating the described piezoelectric wafer, and an acoustic wave device includes the described piezoelectric wafer.

Dependencies are inferred from the claim text.