| http://www.w3.org/ns/prov#value | - Preferred is a piezoelectric material selected from the group consisting of PVDF (d33 about 23 pm/V [see IEEE 5th International Symposium on Micro Machine and Human Science Proceedings, Nagoya, October 1994, p. 75]), PZT (d33 about 250-300 pm/V) and BaTiO3 (d33 about 150 pm/V).
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