| http://www.w3.org/ns/prov#value | - It should be noted that as a material for the piezoelectric layer 70 which constitutes the piezoelectric elements 300, a ferroelectric-piezoelectric material including lead-titanate-zirconate (PZT), for example, or a relaxor ferroelectric obtained by adding metal such as niobium, nickel, magnesium, bismuth, or yttrium in the ferroelectric-piezoelectric material is used.
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